{"title":"Butyl Pond Liners UK | Premium Rubber | 20 Year Guarantee","description":"\u003ch2\u003eButyl Pond Liners UK — Premium Rubber Liners with Lifetime Guarantee\u003c\/h2\u003e\n\n\u003cp\u003eButyl rubber pond liner is the premium choice for UK pond owners who want the best. With a lifetime guarantee, outstanding flexibility, and proven performance over 50+ years, butyl is the liner of choice for high-value koi ponds, heritage garden restorations, and any application where \"install once and never replace\" is the objective.\u003c\/p\u003e\n\n\u003ch2\u003eWhat Makes Butyl the Premium Pond Liner?\u003c\/h2\u003e\n\u003cp\u003eButyl rubber (isobutylene-isoprene rubber, IIR) has the lowest unsaturation of any commercial elastomer. This fundamental chemistry gives butyl three performance advantages that no other liner material can match:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLifetime guarantee:\u003c\/strong\u003e Butyl's near-saturated polymer backbone is inherently resistant to UV, ozone, and thermal oxidation — the primary degradation mechanisms for all rubber materials. This is why quality butyl carries a lifetime guarantee rather than the 25-year guarantee of EPDM.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExceptional flexibility:\u003c\/strong\u003e Elongation at break 350–420%, Shore A hardness 50–60 — butyl conforms perfectly to complex pond shapes and accommodates any subgrade movement without stress.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide temperature range:\u003c\/strong\u003e -40°C to +120°C continuous service. Butyl remains pliable and undamaged at the most extreme UK winter temperatures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eButyl vs EPDM — When to Upgrade\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFactor\u003c\/th\u003e\n\u003cth\u003eEPDM 0.75mm\u003c\/th\u003e\n\u003cth\u003eButyl 0.75mm\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e25 years\u003c\/td\u003e\n\u003ctd\u003eLifetime (50+ years)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrice per m²\u003c\/td\u003e\n\u003ctd\u003e£2.80–4.50\u003c\/td\u003e\n\u003ctd\u003e£3.50–5.50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation at break\u003c\/td\u003e\n\u003ctd\u003e300–450%\u003c\/td\u003e\n\u003ctd\u003e350–420%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature range\u003c\/td\u003e\n\u003ctd\u003e-40°C to 120°C\u003c\/td\u003e\n\u003ctd\u003e-40°C to 120°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish safe\u003c\/td\u003e\n\u003ctd\u003eYes (EPDM-45)\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eMost garden ponds\u003c\/td\u003e\n\u003ctd\u003ePremium koi, heritage, \"once and forever\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThe 20–30% price premium for butyl over EPDM is typically justified for: high-value koi collections where liner replacement would be catastrophic; heritage garden restorations where the pond may not be accessible again; commercial or large ponds where re-lining cost exceeds the initial premium many times over.\u003c\/p\u003e\n\n\u003ch2\u003eButyl Pond Liner Installation\u003c\/h2\u003e\n\u003cp\u003eButyl installation follows the same principles as EPDM, with one key difference — seaming uses butyl joining tape with primer rather than self-adhesive EPDM tape:\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eApply IIR-compatible primer to both seam surfaces. Allow primer to become tacky (5–10 minutes).\u003c\/li\u003e\n\u003cli\u003eApply butyl joining tape (50mm or 100mm width) to one surface, pressing firmly across the full width.\u003c\/li\u003e\n\u003cli\u003eBring the second surface onto the tape and apply firm rolling pressure with a J-roller.\u003c\/li\u003e\n\u003cli\u003eAllow minimum 4 hours cure before filling (24 hours in cold conditions below 10°C).\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTechnical Specification — 0.75mm Butyl\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTensile Strength: 7.0–9.0 MPa (ASTM D412)\u003c\/li\u003e\n\u003cli\u003eElongation at Break: 350–420% (ASTM D412)\u003c\/li\u003e\n\u003cli\u003eShore A Hardness: 50–60 (ASTM D2240)\u003c\/li\u003e\n\u003cli\u003eTear Strength: 20–28 kN\/m (ASTM D624)\u003c\/li\u003e\n\u003cli\u003ePuncture Resistance: 130–180 N (ASTM D4833)\u003c\/li\u003e\n\u003cli\u003eMass per unit area: 0.86 kg\/m²\u003c\/li\u003e\n\u003cli\u003eService temperature: -40°C to +120°C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\": \"Question\", \"name\": \"How long does butyl pond liner last?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Quality 0.75mm butyl pond liner carries a lifetime guarantee \\u2014 typically 50+ years of service life. The material's very low unsaturation (only 0.6\\u20132.0% isoprene content) makes it inherently resistant to UV, ozone, and thermal oxidation. Premature failure of butyl is almost always caused by installation damage, not material degradation.\"}},{\"@type\": \"Question\", \"name\": \"Is butyl better than EPDM?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Butyl and EPDM are both excellent pond liner materials. Butyl offers a lifetime guarantee vs 25 years for EPDM, at a 20\\u201330% price premium. For most garden ponds, EPDM provides outstanding performance at better value. For high-value koi ponds, heritage restorations, or any 'install once and never replace' application, butyl's lifetime guarantee is worth the premium.\"}},{\"@type\": \"Question\", \"name\": \"What is the difference between butyl and EPDM pond liner?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Both are synthetic rubber liners with similar flexibility and UV resistance. The key differences: butyl carries a lifetime guarantee (vs 25 years for EPDM) due to its fundamentally lower unsaturation; butyl uses butyl joining tape with primer for seams (vs self-adhesive EPDM tape); butyl costs 20\\u201330% more per m\\u00b2. Both are fish-safe and suitable for all UK pond applications.\"}},{\"@type\": \"Question\", \"name\": \"Can butyl pond liner be used with fish and koi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes \\u2014 butyl rubber is completely fish-safe and inert. It contains no harmful plasticisers, heavy metals, or leachable compounds. Koi keepers worldwide have trusted butyl for decades, and its proven track record in high-value koi ponds makes it the premium choice for serious koi keeping.\"}}]}\u003c\/script\u003e\u003cp\u003e\u003ca href=\"\/pages\/get-expert-advice\"\u003eFree expert advice on butyl pond liner →\u003c\/a\u003e\u003c\/p\u003e","products":[{"product_id":"butyl-rubber-pond-liner-0-75mm-20-year-guarantee-fish-safe-uk","title":"Butyl Rubber Pond Liner UK | 20 Year Guarantee | Premium Grade","description":"\u003ch2\u003eButyl Rubber Pond Liner UK — 0.75mm Premium Grade | Lifetime Guarantee | Fish Safe\u003c\/h2\u003e\n\u003cp\u003eRegarded by pond professionals as the premium choice in pond liner materials, our \u003cstrong\u003eButyl Rubber Pond Liner 0.75mm\u003c\/strong\u003e represents the pinnacle of pond liner technology. With superior elasticity, an outstanding 40+ year proven track record, and self-sealing properties unmatched by any synthetic alternative, Butyl remains the material of choice for serious pond builders across the United Kingdom.\u003c\/p\u003e\n\u003cp\u003eButyl rubber (isobutylene-isoprene rubber, IIR) has been used in high-specification pond installations for over 50 years. Its unique molecular structure provides exceptional resistance to UV radiation, ozone, and extreme temperatures — maintaining its integrity long after lesser liner materials have failed.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eButyl Rubber (Isobutylene-Isoprene Rubber — IIR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-50°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eOutstanding — superior to all alternatives\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — certified, completely inert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003eLifetime Guarantee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation at Break\u003c\/td\u003e\n\u003ctd\u003e400%+ (superior to EPDM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexibility\u003c\/td\u003e\n\u003ctd\u003eSuperior — premium stretch and recovery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf-Sealing\u003c\/td\u003e\n\u003ctd\u003eMinor punctures tend to self-seal under water pressure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOzone Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Use Cases for Premium Butyl Pond Liner\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🏆 \u003cstrong\u003eShow-Quality Koi Ponds\u003c\/strong\u003e — Where fish values of thousands of pounds justify the very best liner material available\u003c\/li\u003e\n\u003cli\u003e🏛️ \u003cstrong\u003eFormal Architectural Water Features\u003c\/strong\u003e — Luxury garden designs by landscape architects specify Butyl for its premium credentials\u003c\/li\u003e\n\u003cli\u003e🌳 \u003cstrong\u003eEstate and Country Garden Ponds\u003c\/strong\u003e — Large ornamental ponds where quality is prioritised and replacement is not an option\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eComplex Water Features\u003c\/strong\u003e — Streams, cascades, and linked pond systems where superior flexibility is critical\u003c\/li\u003e\n\u003cli\u003e🦢 \u003cstrong\u003eLarge Wildlife Reserves\u003c\/strong\u003e — Commercial wildlife pond installations where long-term reliability is essential\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium ground preparation\u003c\/strong\u003e — Apply a 50–75mm sand layer to the base and compact smooth. Butyl's premium performance deserves a premium foundation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeotextile underlay is essential\u003c\/strong\u003e — Lay 200gsm geotextile underlay across all surfaces before the Butyl liner — non-negotiable for maximum liner lifespan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCareful unfolding\u003c\/strong\u003e — Butyl is heavier than EPDM and benefits from two-person handling on larger sizes. Unfold carefully on a warm day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm with care\u003c\/strong\u003e — Butyl's exceptional elasticity makes forming easy — it stretches readily to contours without stress marks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure permanently\u003c\/strong\u003e — Butyl edges can be bedded under coping stones, sealed with Butyl tape, or chemically bonded. Our technical team can advise on the best termination detail\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhy Butyl Is the Premium Choice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e400%+ stretch — handles complex shapes and ground movement with ease\u003c\/li\u003e\n\u003cli\u003eProven 50+ year longevity in real-world installations\u003c\/li\u003e\n\u003cli\u003eSelf-sealing — minor punctures close under water pressure\u003c\/li\u003e\n\u003cli\u003eRemains flexible to -50°C — the best cold-weather performance of any pond liner\u003c\/li\u003e\n\u003cli\u003eSpecified in premium landscape architecture projects across the UK\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Completely inert, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ Lifetime Guarantee — Premium lifetime material warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Speak to our Butyl installation specialists\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is Butyl worth the premium over EPDM?\u003c\/strong\u003e\u003cbr\u003eA: For high-value koi ponds, formal garden features, or installations where longevity over 50+ years is important, Butyl's superior elasticity and self-sealing properties make it worth the additional investment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I join two Butyl sheets for a large pond?\u003c\/strong\u003e\u003cbr\u003eA: Butyl sheets can be joined using specialist Butyl bonding tape and primer, creating a molecular bond as strong as the liner itself.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will Butyl liner affect water chemistry?\u003c\/strong\u003e\u003cbr\u003eA: No. Butyl is completely chemically inert. Safe for koi, goldfish, aquatic plants, and all pond wildlife from day one.\u003c\/p\u003e","brand":"PondLinersco.co.uk","offers":[{"title":"2m x 2m","offer_id":57660498542940,"sku":"BU-2mX2m","price":112.99,"currency_code":"GBP","in_stock":true},{"title":"3m x 2m","offer_id":57660498575708,"sku":"BU-3mX2m","price":162.99,"currency_code":"GBP","in_stock":true},{"title":"3m x 3m","offer_id":57660498608476,"sku":"BU-3mX3m","price":233.99,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":57660498641244,"sku":"BU-4mX3m","price":312.99,"currency_code":"GBP","in_stock":true},{"title":"4m x 4m","offer_id":57660498674012,"sku":"BU-4mX4m","price":424.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":57660498706780,"sku":"BU-5mX4m","price":515.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 5m","offer_id":57660498739548,"sku":"BU-5mX5m","price":646.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 4m","offer_id":57660498772316,"sku":"BU-6mX4m","price":626.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57660498805084,"sku":"BU-6mX5m","price":774.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 6m","offer_id":57660498837852,"sku":"BU-6mX6m","price":928.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 5m","offer_id":57660498870620,"sku":"BU-7mX5m","price":908.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 6m","offer_id":57660498903388,"sku":"BU-7mX6m","price":1088.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 7m","offer_id":57660498936156,"sku":"BU-7mX7m","price":1262.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 5m","offer_id":57660498968924,"sku":"BU-8mX5m","price":1030.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 6m","offer_id":57660499001692,"sku":"BU-8mX6m","price":1236.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 7m","offer_id":57660499034460,"sku":"BU-8mX7m","price":1441.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 8m","offer_id":57660499067228,"sku":"BU-8mX8m","price":1678.99,"currency_code":"GBP","in_stock":true},{"title":"9m x 6m","offer_id":57660499099996,"sku":"BU-9mX6m","price":1389.99,"currency_code":"GBP","in_stock":true},{"title":"9m x 7m","offer_id":57660499132764,"sku":"BU-9mX7m","price":1626.99,"currency_code":"GBP","in_stock":true},{"title":"9m x 8m","offer_id":57660499165532,"sku":"BU-9mX8m","price":1898.99,"currency_code":"GBP","in_stock":true},{"title":"9m x 9m","offer_id":57660499198300,"sku":"BU-9mX9m","price":2089.99,"currency_code":"GBP","in_stock":true},{"title":"10m x 6m","offer_id":57660499231068,"sku":"BU-10mX6m","price":1587.99,"currency_code":"GBP","in_stock":true},{"title":"10m x 7m","offer_id":57660499263836,"sku":"BU-10mX7m","price":1898.99,"currency_code":"GBP","in_stock":true},{"title":"10m x 8m","offer_id":57660499296604,"sku":"BU-10mX8m","price":2021.99,"currency_code":"GBP","in_stock":true},{"title":"10m x 10m","offer_id":57660499329372,"sku":"BU-10mX10m","price":2389.99,"currency_code":"GBP","in_stock":true},{"title":"12m x 8m","offer_id":57660499362140,"sku":"BU-12mX8m","price":2489.99,"currency_code":"GBP","in_stock":true},{"title":"12m x 10m","offer_id":57660499394908,"sku":"BU-12mX10m","price":3123.99,"currency_code":"GBP","in_stock":true},{"title":"15m x 10m","offer_id":57660499427676,"sku":"BU-15mX10m","price":3989.99,"currency_code":"GBP","in_stock":true},{"title":"15m x 12m","offer_id":57660499460444,"sku":"BU-15mX12m","price":4589.99,"currency_code":"GBP","in_stock":true},{"title":"20m x 15m","offer_id":57660499493212,"sku":"BU-20mX10m","price":7878.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/aaa0a4e676d300cf4e3cff3dd8292927.jpg?v=1779039555"},{"product_id":"butyl-rubber-pond-liner-uk-0-75mm-premium-grade-lifetime-guarantee-free-delivery","title":"Butyl Rubber Pond Liner UK | 0.75mm Premium Grade | Lifetime Guarantee","description":"\u003ch2\u003eButyl Rubber Pond Liner UK — 0.75mm Premium Grade | Lifetime Guarantee | Fish Safe\u003c\/h2\u003e\n\u003cp\u003eRegarded by pond professionals as the premium choice in pond liner materials, our \u003cstrong\u003eButyl Rubber Pond Liner 0.75mm\u003c\/strong\u003e represents the pinnacle of pond liner technology. With superior elasticity, an outstanding 40+ year proven track record, and self-sealing properties unmatched by any synthetic alternative, Butyl remains the material of choice for serious pond builders across the United Kingdom.\u003c\/p\u003e\n\u003cp\u003eButyl rubber (isobutylene-isoprene rubber, IIR) has been used in high-specification pond installations for over 50 years. Its unique molecular structure provides exceptional resistance to UV radiation, ozone, and extreme temperatures — maintaining its integrity long after lesser liner materials have failed.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eButyl Rubber (Isobutylene-Isoprene Rubber — IIR)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003e0.75mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-50°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eOutstanding — superior to all alternatives\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — certified, completely inert\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003eLifetime Guarantee\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation at Break\u003c\/td\u003e\n\u003ctd\u003e400%+ (superior to EPDM)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlexibility\u003c\/td\u003e\n\u003ctd\u003eSuperior — premium stretch and recovery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSelf-Sealing\u003c\/td\u003e\n\u003ctd\u003eMinor punctures tend to self-seal under water pressure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOzone Resistance\u003c\/td\u003e\n\u003ctd\u003eExcellent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Use Cases for Premium Butyl Pond Liner\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🏆 \u003cstrong\u003eShow-Quality Koi Ponds\u003c\/strong\u003e — Where fish values of thousands of pounds justify the very best liner material available\u003c\/li\u003e\n\u003cli\u003e🏛️ \u003cstrong\u003eFormal Architectural Water Features\u003c\/strong\u003e — Luxury garden designs by landscape architects specify Butyl for its premium credentials\u003c\/li\u003e\n\u003cli\u003e🌳 \u003cstrong\u003eEstate and Country Garden Ponds\u003c\/strong\u003e — Large ornamental ponds where quality is prioritised and replacement is not an option\u003c\/li\u003e\n\u003cli\u003e💧 \u003cstrong\u003eComplex Water Features\u003c\/strong\u003e — Streams, cascades, and linked pond systems where superior flexibility is critical\u003c\/li\u003e\n\u003cli\u003e🦢 \u003cstrong\u003eLarge Wildlife Reserves\u003c\/strong\u003e — Commercial wildlife pond installations where long-term reliability is essential\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium ground preparation\u003c\/strong\u003e — Apply a 50–75mm sand layer to the base and compact smooth. Butyl's premium performance deserves a premium foundation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeotextile underlay is essential\u003c\/strong\u003e — Lay 200gsm geotextile underlay across all surfaces before the Butyl liner — non-negotiable for maximum liner lifespan\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCareful unfolding\u003c\/strong\u003e — Butyl is heavier than EPDM and benefits from two-person handling on larger sizes. Unfold carefully on a warm day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eForm with care\u003c\/strong\u003e — Butyl's exceptional elasticity makes forming easy — it stretches readily to contours without stress marks\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSecure permanently\u003c\/strong\u003e — Butyl edges can be bedded under coping stones, sealed with Butyl tape, or chemically bonded. Our technical team can advise on the best termination detail\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eWhy Butyl Is the Premium Choice\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e400%+ stretch — handles complex shapes and ground movement with ease\u003c\/li\u003e\n\u003cli\u003eProven 50+ year longevity in real-world installations\u003c\/li\u003e\n\u003cli\u003eSelf-sealing — minor punctures close under water pressure\u003c\/li\u003e\n\u003cli\u003eRemains flexible to -50°C — the best cold-weather performance of any pond liner\u003c\/li\u003e\n\u003cli\u003eSpecified in premium landscape architecture projects across the UK\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Completely inert, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ Lifetime Guarantee — Premium lifetime material warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Speak to our Butyl installation specialists\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is Butyl worth the premium over EPDM?\u003c\/strong\u003e\u003cbr\u003eA: For high-value koi ponds, formal garden features, or installations where longevity over 50+ years is important, Butyl's superior elasticity and self-sealing properties make it worth the additional investment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I join two Butyl sheets for a large pond?\u003c\/strong\u003e\u003cbr\u003eA: Butyl sheets can be joined using specialist Butyl bonding tape and primer, creating a molecular bond as strong as the liner itself.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will Butyl liner affect water chemistry?\u003c\/strong\u003e\u003cbr\u003eA: No. Butyl is completely chemically inert. Safe for koi, goldfish, aquatic plants, and all pond wildlife from day one.\u003c\/p\u003e","brand":"Pond Liners Co","offers":[{"title":"3.5m x 4m \/ Without Underlay","offer_id":57664235340124,"sku":null,"price":466.73,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 4m \/ With Underlay","offer_id":57664235372892,"sku":null,"price":579.22,"currency_code":"GBP","in_stock":true},{"title":"3m x 5m \/ Without Underlay","offer_id":57664235405660,"sku":null,"price":500.23,"currency_code":"GBP","in_stock":true},{"title":"3m x 5m \/ With Underlay","offer_id":57664235438428,"sku":null,"price":605.22,"currency_code":"GBP","in_stock":true},{"title":"4m x 4m \/ Without Underlay","offer_id":57664235471196,"sku":null,"price":533.23,"currency_code":"GBP","in_stock":true},{"title":"4m x 4m \/ With Underlay","offer_id":57664235503964,"sku":null,"price":645.72,"currency_code":"GBP","in_stock":true},{"title":"3m x 5.5m \/ Without Underlay","offer_id":57664235536732,"sku":null,"price":549.98,"currency_code":"GBP","in_stock":true},{"title":"3m x 5.5m \/ With Underlay","offer_id":57664235569500,"sku":null,"price":691.22,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 5m \/ Without Underlay","offer_id":57664235602268,"sku":null,"price":583.23,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 5m \/ With Underlay","offer_id":57664235635036,"sku":null,"price":726.97,"currency_code":"GBP","in_stock":true},{"title":"3m x 6m \/ Without Underlay","offer_id":57664235667804,"sku":null,"price":599.98,"currency_code":"GBP","in_stock":true},{"title":"3m x 6m \/ With Underlay","offer_id":57664235700572,"sku":null,"price":741.22,"currency_code":"GBP","in_stock":true},{"title":"4m x 4.5m \/ Without Underlay","offer_id":57664235733340,"sku":null,"price":599.98,"currency_code":"GBP","in_stock":true},{"title":"4m x 4.5m \/ With Underlay","offer_id":57664235766108,"sku":null,"price":743.72,"currency_code":"GBP","in_stock":true},{"title":"3m x 6.5m \/ Without Underlay","offer_id":57664235798876,"sku":null,"price":649.98,"currency_code":"GBP","in_stock":true},{"title":"3m x 6.5m \/ With Underlay","offer_id":57664235831644,"sku":null,"price":803.72,"currency_code":"GBP","in_stock":true},{"title":"4m x 5m \/ Without Underlay","offer_id":57664235864412,"sku":null,"price":666.47,"currency_code":"GBP","in_stock":true},{"title":"4m x 5m \/ With Underlay","offer_id":57664235897180,"sku":null,"price":810.21,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 6m \/ Without Underlay","offer_id":57664235929948,"sku":null,"price":699.98,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 6m \/ With Underlay","offer_id":57664235962716,"sku":null,"price":878.72,"currency_code":"GBP","in_stock":true},{"title":"4m x 5.5m \/ Without Underlay","offer_id":57664235995484,"sku":null,"price":733.23,"currency_code":"GBP","in_stock":true},{"title":"4m x 5.5m \/ With Underlay","offer_id":57664236028252,"sku":null,"price":911.97,"currency_code":"GBP","in_stock":true},{"title":"4.5m x 5m \/ Without Underlay","offer_id":57664236061020,"sku":null,"price":749.72,"currency_code":"GBP","in_stock":true},{"title":"4.5m x 5m \/ With Underlay","offer_id":57664236093788,"sku":null,"price":928.46,"currency_code":"GBP","in_stock":true},{"title":"4m x 6m \/ Without Underlay","offer_id":57664236126556,"sku":null,"price":799.72,"currency_code":"GBP","in_stock":true},{"title":"4m x 6m \/ With Underlay","offer_id":57664236159324,"sku":null,"price":978.46,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 7m \/ Without Underlay","offer_id":57664236192092,"sku":null,"price":816.23,"currency_code":"GBP","in_stock":true},{"title":"3.5m x 7m \/ With Underlay","offer_id":57664236224860,"sku":null,"price":1019.97,"currency_code":"GBP","in_stock":true},{"title":"5m x 5m \/ Without Underlay","offer_id":57664236257628,"sku":null,"price":833.23,"currency_code":"GBP","in_stock":true},{"title":"5m x 5m \/ With Underlay","offer_id":57664236290396,"sku":null,"price":1011.97,"currency_code":"GBP","in_stock":true},{"title":"5m x 5.5m \/ Without Underlay","offer_id":57664236323164,"sku":null,"price":916.47,"currency_code":"GBP","in_stock":true},{"title":"5m x 5.5m \/ With Underlay","offer_id":57664236355932,"sku":null,"price":1132.71,"currency_code":"GBP","in_stock":true},{"title":"4m x 7m \/ Without Underlay","offer_id":57664236388700,"sku":null,"price":932.98,"currency_code":"GBP","in_stock":true},{"title":"4m x 7m \/ With Underlay","offer_id":57664236421468,"sku":null,"price":1136.72,"currency_code":"GBP","in_stock":true},{"title":"5m x 6m \/ Without Underlay","offer_id":57664236454236,"sku":null,"price":999.48,"currency_code":"GBP","in_stock":true},{"title":"5m x 6m \/ With Underlay","offer_id":57664236487004,"sku":null,"price":1215.72,"currency_code":"GBP","in_stock":true},{"title":"5m x 6.5m \/ Without Underlay","offer_id":57664236519772,"sku":null,"price":1082.72,"currency_code":"GBP","in_stock":true},{"title":"5m x 6.5m \/ With Underlay","offer_id":57664236552540,"sku":null,"price":1331.46,"currency_code":"GBP","in_stock":true},{"title":"5.5m x 6m \/ Without Underlay","offer_id":57664236585308,"sku":null,"price":1099.72,"currency_code":"GBP","in_stock":true},{"title":"5.5m x 6m \/ With Underlay","offer_id":57664236618076,"sku":null,"price":1353.46,"currency_code":"GBP","in_stock":true},{"title":"6m x 6m \/ Without Underlay","offer_id":57664236650844,"sku":null,"price":1199.48,"currency_code":"GBP","in_stock":true},{"title":"6m x 6m \/ With Underlay","offer_id":57664236683612,"sku":null,"price":1453.22,"currency_code":"GBP","in_stock":true},{"title":"5m x 8m \/ Without Underlay","offer_id":57664236716380,"sku":null,"price":1332.73,"currency_code":"GBP","in_stock":true},{"title":"5m x 8m \/ With Underlay","offer_id":57664236749148,"sku":null,"price":1613.97,"currency_code":"GBP","in_stock":true},{"title":"6m x 7m \/ Without Underlay","offer_id":57664236781916,"sku":null,"price":1399.23,"currency_code":"GBP","in_stock":true},{"title":"6m x 7m \/ With Underlay","offer_id":57664236814684,"sku":null,"price":1692.97,"currency_code":"GBP","in_stock":true},{"title":"5m x 9m \/ Without Underlay","offer_id":57664236847452,"sku":null,"price":1499.23,"currency_code":"GBP","in_stock":true},{"title":"5m x 9m \/ With Underlay","offer_id":57664236880220,"sku":null,"price":1819.22,"currency_code":"GBP","in_stock":true},{"title":"6m x 8m \/ Without Underlay","offer_id":57664236912988,"sku":null,"price":1598.98,"currency_code":"GBP","in_stock":true},{"title":"6m x 8m \/ With Underlay","offer_id":57664236945756,"sku":null,"price":1940.22,"currency_code":"GBP","in_stock":true},{"title":"6m x 9m \/ Without Underlay","offer_id":57664236978524,"sku":null,"price":1798.98,"currency_code":"GBP","in_stock":true},{"title":"6m x 9m \/ With Underlay","offer_id":57664237011292,"sku":null,"price":2181.47,"currency_code":"GBP","in_stock":true},{"title":"7m x 8m \/ Without Underlay","offer_id":57664237044060,"sku":null,"price":1865.48,"currency_code":"GBP","in_stock":true},{"title":"7m x 8m \/ With Underlay","offer_id":57664237076828,"sku":null,"price":2259.22,"currency_code":"GBP","in_stock":true},{"title":"6m x 10m \/ Without Underlay","offer_id":57664237109596,"sku":null,"price":1998.72,"currency_code":"GBP","in_stock":true},{"title":"6m x 10m \/ With Underlay","offer_id":57664237142364,"sku":null,"price":2427.46,"currency_code":"GBP","in_stock":true},{"title":"7m x 9m \/ Without Underlay","offer_id":57664237175132,"sku":null,"price":2098.72,"currency_code":"GBP","in_stock":true},{"title":"7m x 9m \/ With Underlay","offer_id":57664237207900,"sku":null,"price":2539.96,"currency_code":"GBP","in_stock":true},{"title":"8m x 8m \/ Without Underlay","offer_id":57664237240668,"sku":null,"price":2131.97,"currency_code":"GBP","in_stock":true},{"title":"8m x 8m \/ With Underlay","offer_id":57664237273436,"sku":null,"price":2586.96,"currency_code":"GBP","in_stock":true},{"title":"7m x 10m \/ Without Underlay","offer_id":57664237306204,"sku":null,"price":2331.73,"currency_code":"GBP","in_stock":true},{"title":"7m x 10m \/ With Underlay","offer_id":57664237338972,"sku":null,"price":2831.72,"currency_code":"GBP","in_stock":true},{"title":"8m x 9m \/ Without Underlay","offer_id":57664237371740,"sku":null,"price":2398.22,"currency_code":"GBP","in_stock":true},{"title":"8m x 9m \/ With Underlay","offer_id":57664237404508,"sku":null,"price":2896.96,"currency_code":"GBP","in_stock":true},{"title":"8m x 10m \/ Without Underlay","offer_id":57664237437276,"sku":null,"price":2664.73,"currency_code":"GBP","in_stock":true},{"title":"8m x 10m \/ With Underlay","offer_id":57664237470044,"sku":null,"price":3230.97,"currency_code":"GBP","in_stock":true},{"title":"9.2m x 9m \/ Without Underlay","offer_id":57664237502812,"sku":null,"price":2758.22,"currency_code":"GBP","in_stock":true},{"title":"9.2m x 9m \/ With Underlay","offer_id":57664237535580,"sku":null,"price":3383.21,"currency_code":"GBP","in_stock":true},{"title":"9m x 10m \/ Without Underlay","offer_id":57664237568348,"sku":null,"price":2997.72,"currency_code":"GBP","in_stock":true},{"title":"9m x 10m \/ With Underlay","offer_id":57664237601116,"sku":null,"price":3622.71,"currency_code":"GBP","in_stock":true},{"title":"10m x 10m \/ Without Underlay","offer_id":57664237633884,"sku":null,"price":3330.72,"currency_code":"GBP","in_stock":true},{"title":"10m x 10m \/ With Underlay","offer_id":57664237666652,"sku":null,"price":4034.46,"currency_code":"GBP","in_stock":true},{"title":"9m x 12m \/ Without Underlay","offer_id":57664237699420,"sku":null,"price":3597.23,"currency_code":"GBP","in_stock":true},{"title":"9m x 12m \/ With Underlay","offer_id":57664237732188,"sku":null,"price":4355.97,"currency_code":"GBP","in_stock":true},{"title":"10m x 12m \/ Without Underlay","offer_id":57664237764956,"sku":null,"price":3996.97,"currency_code":"GBP","in_stock":true},{"title":"10m x 12m \/ With Underlay","offer_id":57664237797724,"sku":null,"price":4839.46,"currency_code":"GBP","in_stock":true},{"title":"10m x 15m \/ Without Underlay","offer_id":57664237830492,"sku":null,"price":4995.98,"currency_code":"GBP","in_stock":true},{"title":"10m x 15m \/ With Underlay","offer_id":57664237863260,"sku":null,"price":6049.72,"currency_code":"GBP","in_stock":true},{"title":"12m x 15m \/ Without Underlay","offer_id":57664237896028,"sku":null,"price":5995.23,"currency_code":"GBP","in_stock":true},{"title":"12m x 15m \/ With Underlay","offer_id":57664237928796,"sku":null,"price":7243.97,"currency_code":"GBP","in_stock":true},{"title":"14m x 20m \/ Without Underlay","offer_id":57664237961564,"sku":null,"price":9325.48,"currency_code":"GBP","in_stock":true},{"title":"14m x 20m \/ With Underlay","offer_id":57664237994332,"sku":null,"price":11562.97,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/92912c498093afdbf1495944cd0912a8.jpg?v=1779039543"},{"product_id":"complete-pond-liner-kit-uk-butyl-0-75mm-geotextile-underlay-premium-bundle","title":"Complete Pond Liner Kit UK | Butyl 0.75mm + Geotextile Underlay | Premium Bundle","description":"\u003ch2\u003ePond Liner Underlay 200gsm UK — Heavy Duty Geotextile | Essential Protection | All Liner Types\u003c\/h2\u003e\n\u003cp\u003eThe single most important accessory for any pond liner installation — our \u003cstrong\u003e200gsm Heavy Duty Geotextile Pond Liner Underlay\u003c\/strong\u003e is the protective foundation that keeps your pond liner in perfect condition for decades. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNeedle-punched polypropylene geotextile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eApproximately 2mm uncompressed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAll pond liner types: EPDM, Butyl, PVC, HDPE, LDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey\/Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — Your chosen pond liner is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. Add 30–40cm on each dimension for edge overlap — or simply order the next size up if you're between sizes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e","brand":"PondLiners Co","offers":[{"title":"3m x 3m","offer_id":57665556152668,"sku":null,"price":220.99,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":57665556185436,"sku":null,"price":295.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":57665556218204,"sku":null,"price":490.99,"currency_code":"GBP","in_stock":true},{"title":"6m x 5m","offer_id":57665556250972,"sku":null,"price":735.99,"currency_code":"GBP","in_stock":true},{"title":"7m x 6m","offer_id":57665556283740,"sku":null,"price":1048.99,"currency_code":"GBP","in_stock":true},{"title":"8m x 6m","offer_id":57665556316508,"sku":null,"price":1176.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/fb57e55f3a874139ca547731d6be61e4_1ea12475-cb90-4bb3-9bde-e67076ccade9.jpg?v=1779039634"},{"product_id":"butyl-pond-liner-underlay-bundle-uk-0-75mm-premium-grade-complete-kit","title":"Butyl Pond Liner \u0026 Underlay Bundle UK | 0.75mm Premium Grade | Complete Kit","description":"\u003ch2\u003ePond Liner Underlay 200gsm UK — Heavy Duty Geotextile | Essential Protection | All Liner Types\u003c\/h2\u003e\n\u003cp\u003eThe single most important accessory for any pond liner installation — our \u003cstrong\u003e200gsm Heavy Duty Geotextile Pond Liner Underlay\u003c\/strong\u003e is the protective foundation that keeps your pond liner in perfect condition for decades. Professional pond builders consider underlay non-negotiable: a pond liner without underlay is a pond liner waiting to fail.\u003c\/p\u003e\n\u003cp\u003eOur geotextile underlay is a heavy-duty 200gsm needle-punched polypropylene fabric — the same professional specification used in commercial reservoir lining, landscape drainage, and civil engineering projects. It acts as a cushion between the ground and your pond liner, absorbing the shock of stones, roots, and ground movement that would otherwise puncture or stress your investment over time.\u003c\/p\u003e\n\u003ch3\u003eFull Technical Specifications\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eProperty\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eNeedle-punched polypropylene geotextile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e200gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eThickness\u003c\/td\u003e\n\u003ctd\u003eApproximately 2mm uncompressed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Range\u003c\/td\u003e\n\u003ctd\u003e-30°C to +70°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUV Resistance\u003c\/td\u003e\n\u003ctd\u003eGood (protected by liner once installed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFish Safe\u003c\/td\u003e\n\u003ctd\u003e✅ Yes — inert polypropylene, non-toxic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGuarantee\u003c\/td\u003e\n\u003ctd\u003e20 Years\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eAll pond liner types: EPDM, Butyl, PVC, HDPE, LDPE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater Permeability\u003c\/td\u003e\n\u003ctd\u003eHigh — allows drainage, does not trap water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eGrey\/Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3\u003e5 Reasons Underlay Is Essential\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e🛡️ \u003cstrong\u003eStone Puncture Protection\u003c\/strong\u003e — Even carefully prepared ground contains sharp stones that can work upward through soil movement. Underlay provides a tough buffer preventing these from reaching your liner\u003c\/li\u003e\n\u003cli\u003e🌱 \u003cstrong\u003eRoot Penetration Barrier\u003c\/strong\u003e — Aquatic plant roots can penetrate most liner materials over time. 200gsm geotextile significantly reduces this risk\u003c\/li\u003e\n\u003cli\u003e🌡️ \u003cstrong\u003eThermal Insulation\u003c\/strong\u003e — Provides a layer of insulation beneath the liner, helping maintain more stable water temperatures in winter\u003c\/li\u003e\n\u003cli\u003e⚡ \u003cstrong\u003eGround Movement Cushioning\u003c\/strong\u003e — Soils expand and contract with moisture changes and frost. Underlay absorbs this movement, preventing it from stressing the liner\u003c\/li\u003e\n\u003cli\u003e⏰ \u003cstrong\u003eExtended Liner Life\u003c\/strong\u003e — Pond liners installed with geotextile underlay last significantly longer than those without. The underlay investment pays for itself many times over\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eStep-by-Step Installation Guide\u003c\/h3\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcavate and clean\u003c\/strong\u003e — Dig your pond and remove all large stones, roots, glass, and sharp debris. The cleaner the substrate, the better\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRoll out the underlay\u003c\/strong\u003e — Starting from one end, roll the underlay fabric into the excavation and press flat against all surfaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap at edges\u003c\/strong\u003e — Allow 30–40cm of underlay to extend beyond the pond edge in all directions, protecting the liner at its most vulnerable point\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverlap joins\u003c\/strong\u003e — If multiple pieces are needed, overlap by at least 300mm. No adhesive needed — the liner weight holds all pieces in position\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstall liner on top\u003c\/strong\u003e — Your chosen pond liner is installed directly on top of the underlay. The two layers work together to provide optimal protection\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003eCompatible With All Pond Liner Types\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ EPDM Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ Butyl Rubber Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ PVC Pond Liner — all thicknesses\u003c\/li\u003e\n\u003cli\u003e✅ HDPE Pond Liner — all grades\u003c\/li\u003e\n\u003cli\u003e✅ LDPE Pond Liner — all grades\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e✅ Trust \u0026amp; Guarantee\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e✅ Fish Safe Certified — Inert polypropylene, safe for all aquatic life\u003c\/li\u003e\n\u003cli\u003e✅ Free UK Delivery — All mainland UK orders delivered free\u003c\/li\u003e\n\u003cli\u003e✅ 20 Year Guarantee — Long-term fabric warranty\u003c\/li\u003e\n\u003cli\u003e✅ Expert Advice Available — Our team can help calculate the exact quantity needed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Do I really need underlay, or can I use sand instead?\u003c\/strong\u003e\u003cbr\u003eA: Sand is a good supplement but not a replacement for geotextile underlay. Sand can be washed away by water movement during pond filling, leaving voids that create pressure points. Use both sand (50mm base layer) AND geotextile underlay for the best protection.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How much underlay do I need?\u003c\/strong\u003e\u003cbr\u003eA: Order the same dimensions as your pond liner. Add 30–40cm on each dimension for edge overlap — or simply order the next size up if you're between sizes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can underlay be used for other applications?\u003c\/strong\u003e\u003cbr\u003eA: Yes. Our 200gsm geotextile is widely used for weed suppression in garden borders, drainage separation layers in decking and paving projects, and erosion control on slopes.\u003c\/p\u003e","brand":"PondLiners Co","offers":[{"title":"3x3m","offer_id":57665829044572,"sku":null,"price":220.99,"currency_code":"GBP","in_stock":true},{"title":"4x3m","offer_id":57665829077340,"sku":null,"price":295.99,"currency_code":"GBP","in_stock":true},{"title":"5x4m","offer_id":57665829110108,"sku":null,"price":490.99,"currency_code":"GBP","in_stock":true},{"title":"6x5m","offer_id":57665829142876,"sku":null,"price":735.99,"currency_code":"GBP","in_stock":true},{"title":"7x6m","offer_id":57665829175644,"sku":null,"price":1048.99,"currency_code":"GBP","in_stock":true},{"title":"8x6m","offer_id":57665829208412,"sku":null,"price":1176.99,"currency_code":"GBP","in_stock":true},{"title":"10x8m","offer_id":57665829241180,"sku":null,"price":1960.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0889\/2035\/9260\/files\/d5be1ff4b6309881a2a0cc1c5c1fab65.jpg?v=1779039528"}],"url":"https:\/\/www.pondlinersco.co.uk\/collections\/butyl-pond-liners.oembed","provider":"PondLinersco.co.uk","version":"1.0","type":"link"}