{"product_id":"4m-x-125m-x-500mu-bba-black-dpm","title":"4m x 12.5m x 500mu BBA Black DPM","description":"\u003cp\u003eThis 500 micron BBA-certified black polyethylene damp-proof membrane (DPM) provides heavy-duty protection against rising damp in ground-floor constructions. At double the thickness of a standard 250 micron DPM, it offers superior puncture resistance on rough sub-bases and hardcore. Compliant with BS 8102 and BBA approved. Supplied in a 4 m × 12.5 m roll (50 m²).\u003c\/p\u003e\n\u003ch3\u003eKey Benefits\u003c\/h3\u003e\n\u003cdiv class=\"sw-benefits-grid\"\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eBBA certified — independently verified performance\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003e500 micron (2000 gauge) — heavy-duty puncture resistance\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eCompliant with BS 8102 for below-ground waterproofing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eEffective barrier against rising damp and ground moisture\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eIdeal for rough sub-bases where puncture risk is higher\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eSuitable beneath slabs, screeds and insulation\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sw-benefit\"\u003e\n\u003cdiv class=\"sw-check\"\u003e​\u003c\/div\u003e\n\u003cspan\u003eUV stabilised black polyethylene\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eApplication\u003c\/h3\u003e\n\u003cp\u003eLay the membrane over the prepared sub-base or blinding layer with a minimum 300 mm overlap at all joints. Seal overlaps with DPM jointing tape. Turn up at perimeters to lap with the wall DPC. Take care to avoid puncturing — protect with a sand blinding layer if laid directly on hardcore. Can also be used as a slip membrane over insulation before screeding with a 150 mm overlap.\u003c\/p\u003e\n\u003ch3\u003eCoverage\u003c\/h3\u003e\n\u003cp\u003eEach roll covers 50 m² (4 m × 12.5 m). Allow approximately 10–15% extra for overlaps and wastage depending on floor plan complexity.\u003c\/p\u003e","brand":"TEKCEM","offers":[{"title":"Default Title","offer_id":51305554608467,"sku":"SCREEDWORKS-12-STD","price":49.8,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/6720\/9043\/files\/Screenshot2025-12-18at11.51.56.png?v=1766055135","url":"https:\/\/shop.screedworks.co.uk\/products\/4m-x-125m-x-500mu-bba-black-dpm","provider":"screedworks","version":"1.0","type":"link"}