Traditional water-repellent bitumen-impregnated kraft paper building membrane conforming to BS 1521 Class A1, serving as moisture separation layer under timber cladding.
SEND PROJECT DETAILS →| Standard | BS 1521 Class A1 |
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| Water Resistance | Zero water penetration after 24 hours head test |
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| Vapour Check | Acts as traditional breathable weather baffle under timber siding |
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Manufactured in Türkiye under European BS EN quality regimes. Full traceability with third-party lab testing and mill certificates supplied with every bill of lading.
Submit your architectural project bill of quantities (BOQ), tender drawings, or required schedule. Our technical team returns guaranteed DDP / FOB factory pricing and testing certifications within 24 hours.