GCP Preprufe 300R Plus is a 1.2mm heavy-duty HDPE pre-applied waterproofing membrane designed for horizontal below-slab applications on mud slabs, rafts and pile caps, and for vertical blind-side applications using single-sided formwork. Once concrete is poured directly against the membrane, Advanced Bond Technology™ creates a fully bonded, continuous watertight seal that eliminates lateral water migration — removing the need for compartmentalisation used with unbonded systems. The ZipLap™ seam uses colour-coded ZipStrips™ (green and blue) to create a fast adhesive-to-adhesive overlap bond without heat, specialist tools or primers, making it practical year-round including in cold and wet conditions. The UV-resistant surface allows up to 56 days' exposure before concreting, offering useful programme flexibility. Benefits Reduces cost and saves time, fast installation only 2 operators needed. No primers sealants fillets or specialist equipment are required Easy detailing, the membrane is flexible in use but keeps its shape and conforms to corners and other construction details Because the Preprufe 300R is a smooth membrane unlike fabric, mesh or fleece membranes, you are able to clean the surface before concreting to ensure a secure bond Cold applied and single layer, no hot works double layers or protection screed Passive waterproofing – unlike bentonite based systems, does not rely on water exposure activation, is designed to be unaffected by most groundwater contaminants, rain or wet/dry cycling. Good to know Water and vapour proofing for all basement grades to BS 8102:2009. Gas resistance - PREPRUFE® 300R PLUS LT will restrict the ingress of methane, carbon dioxide and radon gases into buildings from landfill and naturally occurring sources and satisfy the performance criteria for a gas-resistant membrane, as defined in BS 8485:2015+A1:2019, Table 7. Independent test results available upon request PREPRUFE® 300R Plus membrane heavy-duty 1.2mm grade can be used in horizontal applications below concrete slabs and on rafts (i.e. mud slabs) and can be applied to vertical concrete substrates poured using blind side single sided formwork systems. PREPRUFE® 300R Plus Membrane is designed to accept the placing of heavy reinforcement using conventional concrete spacers.
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