{"product_id":"pond-liner-underlay-270gsm","title":"Elevate Pond Liner Underlay, 270gsm","description":"\u003cdiv class=\"myacre-pdp\"\u003e\n\u003cp class=\"ma-eyebrow\"\u003e\u003ca href=\"\/collections\/water-features\"\u003eElevate\u003c\/a\u003e · Pond Liner Underlay\u003c\/p\u003e\n\n\u003ch2\u003eThe owner's insights on liner underlay\u003c\/h2\u003e\n\u003cp\u003eUnderlay is the cheapest part of a pond build and the one that decides whether the expensive part survives. It goes between the excavated ground and the liner, and it takes the punishment that would otherwise reach the rubber.\u003c\/p\u003e\n\u003cp\u003eEPDM is puncture resistant, not puncture proof. Liners almost never fail because the rubber wore out. They fail because a sharp stone, a root or a bit of broken tile was left in the base and worked through under the weight of the water. A pond holds more than a tonne per cubic metre and it presses down on every one of those points, permanently.\u003c\/p\u003e\n\u003cp\u003eAt 270 gsm this is a proper geotextile, not the thin dressmaker's fleece sometimes sold for the job. Use it under every liner, on every build, including ones where the base looks clean.\u003c\/p\u003e\n\n\u003ch3\u003eHow much do you need?\u003c\/h3\u003e\n\u003cdiv class=\"ma-grid\"\u003e\n\u003cdiv class=\"ma-card\"\u003e\n\u003ch4\u003eSame size as the liner\u003c\/h4\u003e\n\u003cp\u003eWork out your liner size first, then order the same area of underlay. Length + (2 × depth) + 60 cm, and the same again for width.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ma-card\"\u003e\n\u003ch4\u003eOverlap the joins\u003c\/h4\u003e\n\u003cp\u003eUnderlay does not need sealing. Where two runs meet, overlap them by about 15 cm and carry on.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ma-card\"\u003e\n\u003ch4\u003eTwo roll shapes\u003c\/h4\u003e\n\u003cp\u003eThe 2 m x 150 m roll suits long narrow runs and streams. The 6 m x 30 m roll covers a wide pond base in fewer passes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"ma-card\"\u003e\n\u003ch4\u003eDo not skip the walls\u003c\/h4\u003e\n\u003cp\u003eTake it up the sides as well as across the base. Roots come in sideways more often than people expect.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"ma-cta-panel\"\u003e\n\u003ch3\u003eOrdering liner at the same time?\u003c\/h3\u003e\n\u003cp\u003eTell us the pond dimensions once and we will size the liner and the underlay together, so the two arrive matched.\u003c\/p\u003e\n\u003ca href=\"tel:1300515620\" class=\"ma-cta-btn\"\u003eCall today\u003c\/a\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eUnderlay specifications\u003c\/h2\u003e\n\u003ctable class=\"ma-spec\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eMaterial\u003c\/th\u003e\n\u003ctd\u003eNon-woven geotextile\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e270 gsm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRoll sizes\u003c\/th\u003e\n\u003ctd\u003e2 m x 150 m, and 6 m x 30 m\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUse\u003c\/th\u003e\n\u003ctd\u003eBeneath EPDM pond liner on the base and walls of the excavation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eJoins\u003c\/th\u003e\n\u003ctd\u003eOverlap approximately 15 cm. No sealing required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAlso available\u003c\/th\u003e\n\u003ctd\u003eRock Pad 500 gsm for heavy rock-set builds, and a gravel barrier for wetland and gravel beds. Ask us\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eElevate, supplied through Aquascape Australia\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003cdiv class=\"ma-faq\"\u003e\n\u003cdetails class=\"ma-q\"\u003e\u003csummary\u003eDo I really need underlay under a pond liner?\u003c\/summary\u003e\u003cdiv class=\"ma-a\"\u003e\u003cp\u003eYes, on every build. EPDM is puncture resistant rather than puncture proof, and liners almost always fail because something sharp was left under them, not because the rubber wore out. Underlay is the cheapest component in the pond and it protects the most expensive one.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ma-q\"\u003e\u003csummary\u003eHow much underlay do I need?\u003c\/summary\u003e\u003cdiv class=\"ma-a\"\u003e\u003cp\u003eThe same area as the liner. Work the liner size out first, using pond length plus twice the maximum depth plus 60 cm of overlap, then order the same coverage in underlay.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ma-q\"\u003e\u003csummary\u003eCan I use old carpet or sand instead?\u003c\/summary\u003e\u003cdiv class=\"ma-a\"\u003e\u003cp\u003eWe would not. Carpet holds water and rots, and sand washes out of the walls before the liner is even in. A 270 gsm geotextile stays put, drains, and does not break down under a permanently wet load.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ma-q\"\u003e\u003csummary\u003eDo the joins need sealing?\u003c\/summary\u003e\u003cdiv class=\"ma-a\"\u003e\u003cp\u003eNo. Underlay is a protective layer, not a waterproof one. Overlap adjacent runs by around 15 cm and lay the liner over the top.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ma-q\"\u003e\u003csummary\u003eWhich roll should I choose?\u003c\/summary\u003e\u003cdiv class=\"ma-a\"\u003e\u003cp\u003eThe 2 m x 150 m roll suits streams and long narrow runs. The 6 m x 30 m roll covers a wide pond base in fewer passes with fewer overlaps. Call us with the shape and we will work it out with you.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Do I really need underlay under a pond liner?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, on every build. EPDM is puncture resistant rather than puncture proof, and liners almost always fail because something sharp was left under them, not because the rubber wore out.\"}}, {\"@type\": \"Question\", \"name\": \"How much underlay do I need?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The same area as the liner. Work the liner size out first, using pond length plus twice the maximum depth plus 60 cm of overlap, then order the same coverage in underlay.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use old carpet or sand instead?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"We would not. Carpet holds water and rots, and sand washes out of the walls before the liner is even in. A 270 gsm geotextile stays put, drains, and does not break down under a permanently wet load.\"}}, {\"@type\": \"Question\", \"name\": \"Do the joins need sealing?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. Underlay is a protective layer, not a waterproof one. Overlap adjacent runs by around 15 cm and lay the liner over the top.\"}}, {\"@type\": \"Question\", \"name\": \"Which roll should I choose?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 2 m x 150 m roll suits streams and long narrow runs. The 6 m x 30 m roll covers a wide pond base in fewer passes with fewer overlaps.\"}}]}\n\u003c\/script\u003e\n\n\u003clink rel=\"stylesheet\" href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0733\/0856\/9790\/files\/ma-pdp-myacre_a9ff4e59-917f-40a7-832b-e9a525b10b31.css?v=1788732521\"\u003e\n\u003c\/div\u003e","brand":"Aquascape","offers":[{"title":"2 m x 150 m","offer_id":48854467969214,"sku":"ulay2702m150m","price":999.0,"currency_code":"AUD","in_stock":true},{"title":"6 m x 30 m","offer_id":48854468133054,"sku":"ulay2706m","price":769.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/0856\/9790\/files\/29169_CLOSEUP_PHOTO_CLR_SQ_300dpi_Boxed_10x15_GeotextileUnderlayment_jpg_9e4e3b8b-1f18-4281-bdc6-65af53cb666e.jpg?v=1788834237","url":"https:\/\/myacre.com.au\/products\/pond-liner-underlay-270gsm","provider":"My Acre","version":"1.0","type":"link"}