With the Soudal sws Inside Extra butyl sealing membrane, you create a reliable airtight and vapour-retardant seal around interior window and door joints. Measuring 200 mm wide and 30 m long, this membrane prevents air leakage, drafts, and moisture penetration into the surrounding insulation. The high-tack adhesive layer ensures rapid and secure initial bonding to both the frame and the structural substrate. Thanks to its soft synthetic fleece exterior, you can plaster or render directly over the membrane without complex surface preparation. This enables you to deliver clean, durable, and energy-efficient building envelopes on every new build or renovation project.
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