{"title":"Pond Liner Underlay UK | 60gsm \u0026 200gsm Geotextile Fleece","description":"\u003cp\u003ePond liner underlay is the layer that goes between the excavated ground and your liner. It stops grit, stones and roots rubbing against the membrane as the pond fills, settles and moves through the seasons. We sell it in two weights, each in 93 sizes from 2m x 2m up to 45m x 40m, so you can order the same size as your liner and cover the whole excavation.\u003c\/p\u003e\n\u003ch2\u003eWhich underlay weight do I need?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/premium-pond-liner-underlay-sheets-heavy-duty-200gsm-best-selling-easy-cut-long-lasting-protection\"\u003e200gsm heavy-duty underlay\u003c\/a\u003e\u003c\/strong\u003e: the choice for most ponds. Use it on stony, flinty or root-filled ground, under koi ponds, and wherever rocks, plant baskets or heavy edging sit on the liner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003ca href=\"\/products\/pond-liner-underlay-60gsm-lightweight\"\u003e60gsm lightweight underlay\u003c\/a\u003e\u003c\/strong\u003e: a lower-cost separating layer for ground that is already smooth and stone-free, such as sandy soil, sanded beds or boarded raised ponds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat size underlay should I order?\u003c\/h2\u003e\n\u003cp\u003eOrder underlay in the same size as your pond liner: pond length plus twice the maximum depth plus the edge overlap, and the same for the width. Our \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond planner\u003c\/a\u003e works out the liner and underlay sizes for you. If your exact size is not listed, choose the next size up that covers both length and width. Where pieces are joined, overlap them by at least 300mm.\u003c\/p\u003e\n\u003cp\u003eNew to underlay? Read our \u003ca href=\"\/pages\/pond-liner-guides-underlay\"\u003epond underlay guides\u003c\/a\u003e, or browse \u003ca href=\"\/collections\/pond-liners\"\u003eall pond liners\u003c\/a\u003e.\u003c\/p\u003e\n","products":[{"product_id":"premium-pond-liner-underlay-sheets-heavy-duty-200gsm-best-selling-easy-cut-long-lasting-protection","title":"Pond Liner Underlay 200gsm | Heavy Duty Geotextile | Protects All Liner Types","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\u003cdiv class=\"plx-keyfacts\" style=\"border:1px solid #d7e3d7;border-left:4px solid #2d6a2d;border-radius:6px;padding:16px 20px;margin:20px 0;background:#f6faf6;\"\u003e\n\u003ch3 style=\"margin-top:0;\"\u003e200gsm Pond Underlay — Key Facts\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e needle-punched, non-woven polypropylene geotextile\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 200gsm (grams per square metre), approximately 2mm thick uncompressed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGuarantee:\u003c\/strong\u003e 20 years\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSizes:\u003c\/strong\u003e 93 sizes, from 2m x 2m (4m²) up to 45m x 40m (1,800m²)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround already smooth and stone-free?\u003c\/strong\u003e Our \u003ca href=\"\/products\/pond-liner-underlay-60gsm-lightweight\"\u003e60gsm lightweight underlay\u003c\/a\u003e is a lower-cost separating layer for well-prepared beds.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse under:\u003c\/strong\u003e EPDM, butyl, PVC, HDPE and LDPE pond liners\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuying an HDPE liner?\u003c\/strong\u003e Our \u003ca href=\"\/products\/heavy-duty-hdpe-pond-liner-40year-guarantee-free-underlay-1\"\u003e40-year HDPE pond liner\u003c\/a\u003e already includes underlay. Our \u003ca href=\"\/products\/industrial-heavy-duty-pond-liner-25-year-guarantee-pond-lining\"\u003e25-year HDPE pond liner\u003c\/a\u003e does not, so add this underlay in the same size.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSold by:\u003c\/strong\u003e PondLinersco.co.uk (Express Matting Services Ltd, Burnley, Lancashire, UK)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\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\n\u003ch3\u003eUnderlay vs Sand vs Old Carpet\u003c\/h3\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003ctr\u003e\n\u003cth\u003eBase layer\u003c\/th\u003e\n\u003cth\u003eHow it performs under a pond liner\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e200gsm geotextile underlay (this product)\u003c\/td\u003e\n\u003ctd\u003eEven cushion over the whole pond; does not wash away; inert and fish safe\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSand only\u003c\/td\u003e\n\u003ctd\u003eGood as a 50mm base, but can wash away during filling and leave voids\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOld carpet\u003c\/td\u003e\n\u003ctd\u003eDegrades and compresses over time and may contain chemicals; not recommended\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cp\u003eBest practice: a 50mm sand base, then this underlay, then the liner.\u003c\/p\u003e\n\u003ch3\u003eHow Much Underlay Do I Need?\u003c\/h3\u003e\n\u003cp\u003eUnderlay is sized exactly like the liner. Measure the pond's longest length, widest width and deepest point, then:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLength = pond length + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eWidth = pond width + (2 x maximum depth) + 0.6m\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eGarden pond 3m x 2m, 0.6m deep:\u003c\/strong\u003e 4.8m x 3.8m, so order \u003cstrong\u003e5m x 4m\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKoi pond 6m x 4m, 1.5m deep:\u003c\/strong\u003e 9.6m x 7.6m, so order \u003cstrong\u003e10m x 8m\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eBetween sizes? Choose the next size up, or use the \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond liner size calculator\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003ePond Underlay: Questions Answered\u003c\/h3\u003e\n\u003ch4\u003eDoes pond underlay go on top of or under the liner?\u003c\/h4\u003e\n\u003cp\u003eGeotextile pond underlay goes beneath the pond liner — between the excavated soil and the liner. The underlay protects the liner from below. Some installations also use a layer of underlay on top of the liner beneath heavy rocks, but the primary underlay layer is always beneath the liner.\u003c\/p\u003e\n\u003ch4\u003eWhat GSM pond underlay should I use?\u003c\/h4\u003e\n\u003cp\u003e200gsm non-woven geotextile is the standard recommendation for most UK garden ponds. Use 300gsm for rocky or flint-heavy soil, natural swimming ponds, or commercial installations. 100gsm is insufficient for effective protection and is not recommended.\u003c\/p\u003e\n\u003ch4\u003eCan I use old carpet instead of pond underlay?\u003c\/h4\u003e\n\u003cp\u003eOld carpet was historically used as pond underlay but is not recommended. Carpet degrades and compresses over time, can introduce biocides and synthetic fibres into pond water, and does not provide consistent protection. Purpose-made geotextile underlay is inexpensive, durable, and specifically designed for pond use.\u003c\/p\u003e\n\u003ch4\u003eWhat size underlay do I need for my pond?\u003c\/h4\u003e\n\u003cp\u003eOrder underlay in the same size as your pond liner, so it covers the whole liner footprint. For a 3m x 2m pond that is 0.6m deep, the liner works out at 4.8m x 3.8m, so order the 5m x 4m underlay.\u003c\/p\u003e\n\u003ch4\u003eHow do I join two pieces of pond underlay?\u003c\/h4\u003e\n\u003cp\u003eOverlap the pieces by at least 300mm. No adhesive is needed; the weight of the liner and water holds the pieces in position.\u003c\/p\u003e\n\u003ch4\u003eIs underlay included with your HDPE pond liners?\u003c\/h4\u003e\n\u003cp\u003eOur 40-year HDPE pond liner includes underlay. Our 25-year HDPE pond liner does not, so order this 200gsm underlay in the same size as the liner.\u003c\/p\u003e\n\u003ch4\u003eCan this underlay be used for other jobs?\u003c\/h4\u003e\n\u003cp\u003eYes. 200gsm geotextile is also used for weed suppression in garden borders, as a separation layer under decking and paving, and for erosion control on slopes.\u003c\/p\u003e\n\u003ch4\u003eWhat is the largest size available?\u003c\/h4\u003e\n\u003cp\u003eThe largest standard size is 45m x 40m (1,800m²). For larger or bespoke projects, contact our team for advice.\u003c\/p\u003e\n\u003ch3\u003ePond Underlay Guides\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/pond-liner-underlay-complete-buying-guide-uk\"\u003ePond Liner Underlay — Complete UK Buying Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/do-you-need-pond-liner-underlay-uk-expert-guide-2025\"\u003eDo You Need Pond Liner Underlay? UK Expert Guide\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/pond-liner-fleece-underlay-vs-geotextile-uk-which-is-better\"\u003eFleece Underlay vs Geotextile — Which Is Better?\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/blogs\/news\/pond-liner-installation-guide-uk-all-types\"\u003ePond Liner Installation Guide — All Liner Types\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eShop liners: \u003ca href=\"\/collections\/pond-liners\"\u003eall pond liners\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"PondLinersco.co.uk","offers":[{"title":"2m x 2m","offer_id":55312525164892,"sku":"UDL-200-2mX2m","price":31.24,"currency_code":"GBP","in_stock":true},{"title":"2.5m x 2m","offer_id":55312525197660,"sku":"UDL-200-25mX2m","price":38.74,"currency_code":"GBP","in_stock":true},{"title":"3m x 3m","offer_id":55312525230428,"sku":"UDL-200-3mX3m","price":71.24,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":55312525263196,"sku":"UDL-200-4mX3m","price":91.24,"currency_code":"GBP","in_stock":true},{"title":"4m x 4m","offer_id":55312525295964,"sku":"UDL-200-4mX4m","price":112.49,"currency_code":"GBP","in_stock":true},{"title":"5m x 3m","offer_id":55312525328732,"sku":"UDL-200-5mX3m","price":104.99,"currency_code":"GBP","in_stock":true},{"title":"5m x 4m","offer_id":55312525361500,"sku":"UDL-200-5mX4m","price":143.74,"currency_code":"GBP","in_stock":true},{"title":"5m x 4.5m","offer_id":59348543373660,"sku":"UDL-200-5mX45m","price":161.9,"currency_code":"GBP","in_stock":true},{"title":"5m x 5m","offer_id":55312525394268,"sku":"UDL-200-5mX5m","price":178.74,"currency_code":"GBP","in_stock":true},{"title":"6m x 3m","offer_id":55312525427036,"sku":"UDL-200-6mX3m","price":141.24,"currency_code":"GBP","in_stock":true},{"title":"6m x 4m","offer_id":55312525459804,"sku":"UDL-200-6mX4m","price":178.74,"currency_code":"GBP","in_stock":true},{"title":"6m x 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Well-Prepared Ground\u003c\/h2\u003e\n\u003cp\u003eIf you are lining a pond on ground that is already fine, sandy or stone-free, you still want a buffer between the soil and the liner, but you may not need a heavy-duty fleece. This 60gsm pond liner underlay is the lightweight grade: a thin, flexible geotextile fleece that lies under your liner and takes the rub from grit, small stones and fine roots. It is sold in 93 sizes from 2m x 2m up to 45m x 40m, so you can order the same footprint as your liner and cover the whole excavation in one go. It suits budget builds, small wildlife ponds, temporary or short-life water features, and contractors who want an economical layer on carefully prepared beds.\u003c\/p\u003e\n\n\u003ch3\u003eWhy it works\u003c\/h3\u003e\n\u003ch4\u003eA separating layer, not a cushion\u003c\/h4\u003e\n\u003cp\u003eAt 60 grams per square metre, this underlay is thin and light. Its job is to stop the liner sitting directly on soil, where grit and small stones can scuff and abrade the membrane as the pond fills, settles and moves through the seasons. Because it is lightweight it drapes closely into shelves, slopes and corners without bulky folds, which makes it quick to lay and easy to tuck under edging.\u003c\/p\u003e\n\u003ch4\u003eSized to your liner\u003c\/h4\u003e\n\u003cp\u003eOrder the same size as your liner and you have enough underlay to cover the full footprint, including the overlap around the edge. The ordered area is supplied as sheets of 8m x 2m or 5m x 2m, which you lay side by side and overlap at the joins. Sheets are easier to handle on site than one large piece, and they let you work around plant shelves a strip at a time.\u003c\/p\u003e\n\u003ch4\u003eKnow its limits\u003c\/h4\u003e\n\u003cp\u003eA 60gsm fleece is not designed to stop sharp flints, tree roots or rubble. On stony, flinty or root-filled ground, or under a koi pond with heavy rockwork, choose our \u003ca href=\"\/products\/premium-pond-liner-underlay-sheets-heavy-duty-200gsm-best-selling-easy-cut-long-lasting-protection\"\u003e200gsm heavy-duty underlay\u003c\/a\u003e instead.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e60gsm lightweight geotextile underlay\u003c\/li\u003e\n\u003cli\u003e93 sizes from 2m x 2m to 45m x 40m\u003c\/li\u003e\n\u003cli\u003eSupplied as 8m x 2m or 5m x 2m sheets covering the ordered area\u003c\/li\u003e\n\u003cli\u003eGoes under any flexible pond liner\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhere it's used\u003c\/h3\u003e\n\u003cp\u003eGarden and wildlife ponds dug in sandy or loamy soil, raised and timber-framed ponds where the base is boarded or smooth, bog gardens and shallow marginal areas, temporary water features at shows and events, and contract landscaping jobs where the bed has been raked, screened and sanded before lining. It is also handy as an extra separating layer over a sand bed.\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e60gsm (grams per square metre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGrade\u003c\/th\u003e\n\u003ctd\u003eLightweight \/ basic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSizes\u003c\/th\u003e\n\u003ctd\u003e93 sizes, 2m x 2m to 45m x 40m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSupplied as\u003c\/th\u003e\n\u003ctd\u003eSheets of 8m x 2m or 5m x 2m that together cover the ordered size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFibre and thickness\u003c\/th\u003e\n\u003ctd\u003eNot published for this line\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eColour\u003c\/th\u003e\n\u003ctd\u003eNot published for this line (pictured: mottled grey)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eBeneath flexible pond liners (EPDM, butyl, PVC, LDPE, HDPE)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eChoosing the right option\u003c\/h3\u003e\n\u003cp\u003eStart with your liner size. Work it out as pond length plus twice the maximum depth plus the edge overlap, and the same for the width; our \u003ca href=\"\/pages\/pond-liner-size-calculator\"\u003epond planner\u003c\/a\u003e does the sum for you. Then choose the underlay size that matches or exceeds the liner in both directions. If your exact size is not listed, go up to the next size that covers both dimensions, because any surplus can be folded under at the edge or used as a second layer on the floor of the pond.\u003c\/p\u003e\n\u003cp\u003eNext, decide on the weight. Choose this 60gsm grade when the ground is smooth and you have removed stones, roots and debris, or where the pond is small and shallow. Choose our 200gsm heavy-duty underlay for stony or flinty soil, ponds with heavy rocks or plant baskets on the base, koi ponds, and anywhere you want the most protection. Many builders use 200gsm on the floor and 60gsm on gentle, stone-free sides.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation, use \u0026amp; care\u003c\/h3\u003e\n\u003cp\u003eClear the excavation of stones, roots and anything sharp, then firm and smooth the surface. Lay the sheets from the deepest point outwards, overlapping each join by at least 300mm, and press the fleece into the shelves and corners. Hold the edges with smooth stones while you position the liner on top, then trim any excess once the pond is full and the edging is in place. Store unused sheets dry and rolled.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently asked questions\u003c\/h3\u003e\n\u003ch4\u003eIs 60gsm thick enough for my pond?\u003c\/h4\u003e\n\u003cp\u003eIt is suitable on ground that is already smooth and free of stones and roots. It is a separating layer rather than a puncture barrier, so on stony or flinty ground use 200gsm.\u003c\/p\u003e\n\u003ch4\u003eWill the underlay arrive as one piece?\u003c\/h4\u003e\n\u003cp\u003eNo. The ordered size is supplied as sheets of 8m x 2m or 5m x 2m that together cover the area. Overlap the sheets by at least 300mm.\u003c\/p\u003e\n\u003ch4\u003eCan I use it on top of the liner?\u003c\/h4\u003e\n\u003cp\u003eYes. A layer laid over the liner under rocks or pebbles helps protect the liner from above. For heavy rockwork the 200gsm grade is the better choice.\u003c\/p\u003e\n\u003ch4\u003eWhat size should I order?\u003c\/h4\u003e\n\u003cp\u003eOrder the same size as your liner, or the next size up that covers both length and width.\u003c\/p\u003e\n\n\u003ch3\u003eOrdering \u0026amp; delivery\u003c\/h3\u003e\n\u003cp\u003eChoose your size from the list and add it to your basket alongside your liner. Delivery options and costs are shown at checkout before you pay. If you are unsure which size or weight you need, contact us with your pond dimensions and we will help you work it out.\u003c\/p\u003e\n","brand":"PondLinersco.co.uk","offers":[{"title":"2m x 2m","offer_id":59348448215388,"sku":"PLC-UL60-2X2","price":14.9,"currency_code":"GBP","in_stock":true},{"title":"2.5m x 2m","offer_id":59348448248156,"sku":"PLC-UL60-2P5X2","price":18.9,"currency_code":"GBP","in_stock":true},{"title":"3m x 3m","offer_id":59348448280924,"sku":"PLC-UL60-3X3","price":32.9,"currency_code":"GBP","in_stock":true},{"title":"4m x 3m","offer_id":59348448313692,"sku":"PLC-UL60-4X3","price":43.9,"currency_code":"GBP","in_stock":true},{"title":"4m x 4m","offer_id":59348448346460,"sku":"PLC-UL60-4X4","price":57.9,"currency_code":"GBP","in_stock":true},{"title":"5m x 3m","offer_id":59348448379228,"sku":"PLC-UL60-5X3","price":54.9,"currency_code":"GBP","in_stock":true},{"title":"5m x 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