Airtight and vapour-tight interior sealing
- Effective vapour diffusion barrier: This Soudal membrane prevents interior moisture ingress into wall cavities and eliminates draughts around window frames.
- Directly plasterable non-woven surface: The flexible fleece surface allows you to apply plaster or render straight over the sealed joint.
- Wide profile for joints: The 300 mm width ensures you can bridge wide structural gaps and uneven reveals with ease.
Create an airtight and vapour-tight seal around your interior window and door joints with the Soudal sws Inside Standard membrane. This flexible butyl membrane prevents warm indoor air and moisture from penetrating perimeter insulation, stopping draughts and condensation at the source. With a generous 300 mm width and a 30 m roll length, you can effortlessly bridge wide structural gaps and uneven reveals. The self-adhesive strip fixes directly to the window profile, while the membrane bonds to the masonry using compatible adhesives such as Soudafoil 330D or Soudafoil 360H. Its non-woven fleece surface allows you to apply plaster or render straight over the finished seal.