{"product_id":"20mm-stud-membrane-black-biokil-crown-high-capacity-cavity-drainage-membrane","title":"20mm Stud Membrane - Black - Biokil Crown - High-Capacity Cavity Drainage Membrane","description":"\u003ch2\u003eBiokil Crown 20mm Stud Membrane – Black\u003c\/h2\u003e\n\u003ch3\u003eHigh-Capacity Cavity Drainage Membrane for Basement Floors and Ground-Bearing Slabs\u003c\/h3\u003e\n\n\u003cp\u003e\n  Biokil Crown 20mm Stud Membrane – Black is a heavy-duty, high-capacity cavity drainage membrane designed for use on basement floors, raft foundations, and ground-bearing slabs where maximum drainage and water movement is required. Manufactured from high-density polyethylene (HDPE), the 20mm stud profile creates a large drainage void beneath floor finishes, directing water to internal drainage systems or sumps as part of a Type C waterproofing solution.\n\u003c\/p\u003e\n\n\u003ch4\u003eKey Features \u0026amp; Benefits\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e20mm Stud Height:\u003c\/strong\u003e Provides superior drainage capacity for high water table or flood-risk environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIdeal for Type C Systems:\u003c\/strong\u003e Designed for use in cavity drainage systems in accordance with BS 8102:2022.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable HDPE Construction:\u003c\/strong\u003e Tough, impact-resistant membrane for long-term below-ground installation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFloor Protection:\u003c\/strong\u003e Isolates finishes from damp or contaminated concrete slabs and helps manage hydrostatic pressure.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with Drainage Channels:\u003c\/strong\u003e Easily integrates with perimeter drainage systems and sump\/pump units.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Details\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-Density Polyethylene (HDPE)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStud Height:\u003c\/strong\u003e 20mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e Approx. 1.0–1.2mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoll Size:\u003c\/strong\u003e Typically 2m x 20m (40m²)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Floor slabs, basement floors, ground-bearing concrete\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e BC20MMBLK\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eApplication Instructions\u003c\/h4\u003e\n\u003col\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSurface Preparation:\u003c\/strong\u003e Remove debris and sharp projections. Ensure slab or substrate is even and structurally sound.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRoll Out Membrane:\u003c\/strong\u003e Lay Biokil Crown 20mm Membrane stud-side down, cutting to size as required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJoin \u0026amp; Seal:\u003c\/strong\u003e Overlap sheets or butt-joint and seal with appropriate tape or jointing accessories.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConnect Drainage:\u003c\/strong\u003e Ensure water flows freely into perimeter drainage or sump systems before applying floor finishes.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eLimitations\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eNot suitable for use as a standalone waterproofing system – must be installed as part of a managed cavity drain system.\u003c\/li\u003e\n  \u003cli\u003eNot designed for wall application – use Biokil Crown 3mm or 8mm membranes for walls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eHealth \u0026amp; Safety\u003c\/h4\u003e\n\u003cp\u003e\n  Always wear gloves and protective clothing when cutting or handling. Refer to the product's Safety Data Sheet (SDS) for full health and safety guidance.\n\u003c\/p\u003e\n","brand":"DIY Refurb","offers":[{"title":"2m X 20m (40sqm)","offer_id":62002183307651,"sku":"CDM20220","price":245.7,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0222\/7290\/1216\/files\/CM20-WEB_eb1ba31b-cd73-43cb-a952-9e26c02a81e7.jpg?v=1784111630","url":"https:\/\/build4less.co.uk\/products\/20mm-stud-membrane-black-biokil-crown-high-capacity-cavity-drainage-membrane","provider":"Build4less","version":"1.0","type":"link"}