{"title":"Foundation Frames","description":"\u003cp\u003eBase Kits\u003c\/p\u003e","products":[{"product_id":"foundation-frame-for-riga-xl-9","title":"Foundation Frame for Riga XL 9","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga XL 9 Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga XL 9 Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga XL 9 greenhouse — one of the largest models in the Riga XL series. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga XL 9 greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga XL 9 footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga XL 9\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-XL9-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$3,149\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga XL 9 greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eComplete Riga Foundation Frame Series\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IVs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-ivs\"\u003eRiga IVs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iv\"\u003eRiga IV Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga V\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-v\"\u003eRiga V Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,749\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 5\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-xl-5\"\u003eRiga XL 5 Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,099\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 6\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-xl-6\"\u003eRiga XL 6 Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 9\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$3,149\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the Riga XL 9 greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe Riga XL 9 is one of the largest models in the Riga XL series — a premium German-engineered greenhouse with the distinctive \"onion\" arch profile, multi-wall polycarbonate glazing, and the structural performance the Riga series is known for. The XL series is the expandable line within the Riga lineup, with the number suffix indicating the length configuration.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga XL 9?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. For the Riga XL 9 — one of the largest greenhouse structures in the Riga lineup — this additional headroom further enhances the already generous interior space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga XL 9 installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Given the large footprint of the Riga XL 9, having two or more people is strongly recommended for frame positioning and alignment. Refer to your Riga XL 9 installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga XL 9 greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517643522334,"sku":"RIGA-XL9-BASE","price":3149.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-xl-6","title":"Foundation Frame for Riga XL 6","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga XL 6 Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga XL 6 Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga XL 6 greenhouse. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga XL 6 greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga XL 6 footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga XL 6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-XL6-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga XL 6 greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eRiga XL 5 vs. Riga XL 6 — Which Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eRiga XL 5 Frame\u003c\/th\u003e\n\u003cth\u003eRiga XL 6 Frame (this product)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga XL 5\u003c\/td\u003e\n\u003ctd\u003eRiga XL 6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,099\u003c\/td\u003e\n\u003ctd\u003e$2,199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-XL5-BASE\u003c\/td\u003e\n\u003ctd\u003eRIGA-XL6-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe XL 5 and XL 6 are different length variants of the Riga XL series. Order the frame that matches your exact greenhouse model. If you are unsure which XL variant you have, check your greenhouse documentation or contact us before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eComplete Riga Foundation Frame Series\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IVs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-ivs\"\u003eRiga IVs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iv\"\u003eRiga IV Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga V\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-v\"\u003eRiga V Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,749\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 5\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-xl-5\"\u003eRiga XL 5 Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,099\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 6\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,199\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Riga XL 5 and XL 6 foundation frames?\u003c\/strong\u003e\u003cbr\u003eThe Riga XL 5 foundation frame ($2,099) is engineered for the Riga XL 5 greenhouse. The Riga XL 6 foundation frame ($2,199) is for the Riga XL 6 — a longer variant of the XL series. Both use the same buried in-ground installation method but are sized to fit their respective greenhouse footprints. Order the frame that matches your exact model.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga XL 6?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. For the Riga XL 6 — one of the largest greenhouse structures available — this additional headroom further enhances the usability of the already generous interior space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga XL 6 installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Given the larger footprint of the Riga XL 6, having two or more people is strongly recommended for frame positioning and alignment. Refer to your Riga XL 6 installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga XL 6 greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517643555102,"sku":"RIGA-XL6-BASE","price":2199.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-xl-5","title":"Foundation Frame for Riga XL 5","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga XL 5 Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga XL 5 Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga XL 5 greenhouse — the largest model in the Riga series. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga XL 5 greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga XL 5 footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga XL 5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-XL5-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,099\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga XL 5 greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eComplete Riga Foundation Frame Series\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IVs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-ivs\"\u003eRiga IVs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iv\"\u003eRiga IV Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga V\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-v\"\u003eRiga V Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,749\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga XL 5\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$2,099\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the Riga XL 5 the same as the Riga XL?\u003c\/strong\u003e\u003cbr\u003eThe Riga XL series includes multiple length configurations. The \"XL 5\" designation refers to a specific length variant within the XL lineup. If you are unsure whether your greenhouse is the XL 5 or a different XL variant, check your greenhouse documentation or contact us with your model number before ordering this foundation frame.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga XL 5?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. For the Riga XL 5 — already one of the largest greenhouse structures available — this additional headroom further enhances the usability of the interior space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga XL 5 installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Given the larger footprint of the Riga XL 5, having two or more people is strongly recommended for frame positioning and alignment. Refer to your Riga XL 5 installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga XL 5 greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517643587870,"sku":"RIGA-XL5-BASE","price":2099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-v","title":"Foundation Frame for Riga V","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga V Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga V Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga V (Riga 5) greenhouse. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space. This is the same base kit referenced as the recommended add-on (+$1,749) in the Riga V greenhouse listing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga V (Riga 5) greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga V footprint (6\" H × 116\" W × 206\" D)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga V (Riga 5)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrame Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6\" H × 116\" W × 206\" D\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds 6\" of height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-V-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,749\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame (6\" H × 116\" W × 206\" D) in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga V greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The 6\" raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IVs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-ivs\"\u003eRiga IVs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iv\"\u003eRiga IV Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga V\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,749\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this the same base kit listed as an add-on in the Riga V greenhouse listing?\u003c\/strong\u003e\u003cbr\u003eYes — this is the exact foundation frame referenced as the recommended +$1,749 add-on in the \u003ca href=\"\/products\/riga-v-9x17-greenhouse-german-made\"\u003eRiga V greenhouse listing\u003c\/a\u003e. If you purchased the Riga V greenhouse without the base kit and now need to add it, this is the correct product to order (note: separate shipping charges apply when ordered independently).\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga V?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — the Riga V foundation frame raises the greenhouse by 6 inches, giving you additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups inside the Riga V’s already generous 7'7\" peak height.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga V installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment given the Riga V’s larger footprint (116\" × 206\"). Refer to your Riga V installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga V greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517643620638,"sku":"RIGA-V-BASE","price":1749.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-ivs","title":"Foundation Frame for Riga IVs","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga IVs Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga IVs Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga IVs greenhouse — the smaller \"S\" variant of the Riga IV series. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga IVs greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga IVs footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga IVs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-IVS-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga IVs greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IVs (smaller \"S\" variant)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,399\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iv\"\u003eRiga IV Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Riga IVs and Riga IV foundation frames?\u003c\/strong\u003e\u003cbr\u003eThe Riga IVs foundation frame ($1,399) is engineered for the shorter \"S\" variant of the Riga IV series. The Riga IV foundation frame ($1,499) is for the standard-length Riga IV. Both use the same buried in-ground installation method but are sized to fit their respective greenhouse footprints. Order the frame that matches your exact model.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga IVs?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga IVs installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment. Refer to your Riga IVs installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga IVs greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517643817246,"sku":"RIGA-IVS-BASE","price":1399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-iv","title":"Foundation Frame for Riga IV","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga IV Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga IV Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga IV greenhouse. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga IV greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga IV footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-IV-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga IV greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iis\"\u003eRiga IIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IV\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,499\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Riga IV and Riga IVs foundation frames?\u003c\/strong\u003e\u003cbr\u003eThe Riga IV foundation frame ($1,499) is engineered for the standard Riga IV. If you have the smaller \"S\" variant (Riga IVs), a different model-specific frame may be required. Contact us with your exact model number to confirm the correct frame before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga IV?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga IV installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment. Refer to your Riga IV installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga IV greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517644144926,"sku":"RIGA-IV-BASE","price":1499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-iis","title":"Foundation Frame for Riga IIs","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga IIs Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga IIs Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga IIs greenhouse — the smaller \"S\" variant of the Riga II series. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga IIs greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga IIs footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga IIs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-IIS-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga IIs greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003cp\u003eRiga foundation frames are model-specific — order the frame that matches your exact greenhouse model:\u003c\/p\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIs (smaller \"S\" variant)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$824\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iiis\"\u003eRiga IIIs Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eIf you are unsure which model you have, check your greenhouse documentation or contact us with your model number before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Riga IIs and Riga IIIs foundation frames?\u003c\/strong\u003e\u003cbr\u003eThe Riga IIs foundation frame ($824) is engineered for the Riga IIs — the smaller \"S\" variant of the Riga II series. The Riga IIIs foundation frame ($1,049) is for the Riga IIIs — the smaller \"S\" variant of the Riga III series. Both use the same buried in-ground installation method but are sized to fit their respective greenhouse footprints. Order the frame that matches your exact model.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga IIs?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga IIs installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment. Refer to your Riga IIs installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga IIs greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517644177694,"sku":"RIGA-IIS-BASE","price":824.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-iiis","title":"Foundation Frame for Riga IIIs","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga IIIs Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga IIIs Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga IIIs greenhouse — the smaller \"S\" variant of the Riga III series. Buried in a trench and backfilled with soil, it securely anchors the greenhouse directly to the ground without requiring a concrete foundation, while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga IIIs greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga IIIs footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga IIIs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-IIIS-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePrice\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga IIIs greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eRiga IIIs vs. Riga III — Which Foundation Frame Do You Need?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eFoundation Frame\u003c\/th\u003e\n\u003cth\u003ePrice\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga IIIs (smaller \"S\" variant)\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eThis frame\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,049\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRiga III (standard)\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/foundation-frame-for-riga-iii\"\u003eRiga III Foundation Frame\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd\u003e$1,299\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eThe Riga IIIs is the shorter length variant of the Riga III series. Both share the same arch width and profile but differ in length — and each requires its own model-specific foundation frame. Make sure you order the frame that matches your exact greenhouse model.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat is the difference between the Riga IIIs and Riga III foundation frames?\u003c\/strong\u003e\u003cbr\u003eThe Riga IIIs foundation frame ($1,049) is engineered for the shorter \"S\" variant of the Riga III series. The Riga III foundation frame ($1,299) is for the standard-length Riga III. Both use the same buried in-ground installation method but are sized to fit their respective greenhouse footprints. Order the frame that matches your exact model.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga IIIs?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Refer to your Riga IIIs installation instructions or contact us for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment. Refer to your Riga IIIs installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga IIIs greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517644210462,"sku":"RIGA-IIIS-BASE","price":1049.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"},{"product_id":"foundation-frame-for-riga-iii","title":"Foundation Frame for Riga III","description":"\u003ch2\u003e\u003cstrong\u003eFoundation Frame for Riga III Greenhouse\u003c\/strong\u003e\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eRiga III Foundation Frame\u003c\/strong\u003e is the purpose-built ground installation solution for the Riga III greenhouse. Rather than requiring a concrete pad, this frame is buried in a trench and backfilled with soil to securely anchor the greenhouse directly to the ground — providing a stable, level foundation while also raising the greenhouse height for additional headroom and growing space.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003e*Free shipping only when purchased together with a Riga greenhouse. Ordered separately, an additional shipping charge applies.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the Riga III greenhouse model\u003c\/li\u003e\n\u003cli\u003eBuried in-ground installation — no concrete required\u003c\/li\u003e\n\u003cli\u003eBackfilled with soil to securely anchor the greenhouse\u003c\/li\u003e\n\u003cli\u003eRaises the greenhouse height — adds headroom and growing space\u003c\/li\u003e\n\u003cli\u003ePurpose-built Riga accessory — engineered to fit the Riga III footprint exactly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRiga III\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuried in trench, backfilled with soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFoundation Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo concrete — installs directly into ground\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBenefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSecures greenhouse to ground; adds height for headroom and growing space\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRIGA-III-BASE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShipping\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree when purchased with a Riga greenhouse; additional charge when ordered separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow the Foundation Frame Works\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003eDig a trench around the perimeter of your greenhouse site to the required depth\u003c\/li\u003e\n\u003cli\u003ePosition the foundation frame in the trench at the correct level\u003c\/li\u003e\n\u003cli\u003eBackfill the trench with soil and compact to secure the frame\u003c\/li\u003e\n\u003cli\u003eAttach the Riga III greenhouse structure to the foundation frame\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003eThis method provides a secure, stable anchor without the cost or permanence of a concrete foundation. The raised frame height also gives you additional interior headroom and growing depth compared to a ground-level installation.\u003c\/p\u003e\n\n\u003ch3\u003eFoundation Frame vs. Concrete Foundation — Which Should You Choose?\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eFoundation Frame (this product)\u003c\/th\u003e\n\u003cth\u003eConcrete Foundation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDig trench, backfill with soil\u003c\/td\u003e\n\u003ctd\u003ePour and cure concrete slab\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCost\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLower — no concrete materials or labor\u003c\/td\u003e\n\u003ctd\u003eHigher — materials, labor, curing time\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePermanence\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRemovable — can be relocated\u003c\/td\u003e\n\u003ctd\u003ePermanent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeadroom Benefit\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes — raises greenhouse height\u003c\/td\u003e\n\u003ctd\u003eDepends on slab thickness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBest For\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSoil or lawn installations without existing concrete\u003c\/td\u003e\n\u003ctd\u003eSites with existing concrete or maximum permanence required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs the foundation frame required for the Riga III?\u003c\/strong\u003e\u003cbr\u003eA proper foundation is strongly recommended for structural integrity, stability, and warranty compliance. The foundation frame is the recommended solution for soil or lawn installations. If you are installing on an existing concrete pad, you may not need this frame — contact us to confirm the right foundation approach for your site.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow deep does the trench need to be?\u003c\/strong\u003e\u003cbr\u003eThe required trench depth depends on your local frost line and soil conditions. Contact us or refer to your Riga III installation instructions for the recommended trench depth for your climate zone.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the foundation frame add headroom inside the greenhouse?\u003c\/strong\u003e\u003cbr\u003eYes — because the frame raises the greenhouse above ground level, you gain additional interior height compared to a ground-level installation. This is a meaningful benefit for tall growers or for hanging baskets and vertical growing setups.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I install the foundation frame myself?\u003c\/strong\u003e\u003cbr\u003eYes — the installation process (dig trench, position frame, backfill, attach greenhouse) is designed for DIY completion. Having two people is recommended for frame positioning and alignment. Refer to your Riga III installation instructions for specific guidance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhy is free shipping only available when purchased with a greenhouse?\u003c\/strong\u003e\u003cbr\u003eThe foundation frame ships free when ordered together with a Riga III greenhouse because it can be included in the same freight shipment. When ordered separately, it ships as a standalone item and an additional shipping charge applies due to its size and weight.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this foundation frame compatible with other Riga models?\u003c\/strong\u003e\u003cbr\u003eNo — this foundation frame is engineered specifically for the Riga III footprint. Other Riga models have their own dedicated foundation frames. Contact us to find the correct foundation frame for your specific Riga model.\u003c\/p\u003e","brand":"Exaco","offers":[{"title":"Default Title","offer_id":59517644275998,"sku":"RIGA-III-BASE","price":1299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/files\/Riga_Base_Foundation_3.webp?v=1786480930"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1078\/1802\/5246\/collections\/Riga_Base_Foundation_1.webp?v=1787346628","url":"https:\/\/rigagreenhousekit.com\/collections\/base-kits.oembed","provider":"Riga Greenhouses","version":"1.0","type":"link"}