SBS Membrane
Styrene-butadiene-styrene-modified bitumen sheet. The SBS modifier makes it elastomeric, so it stretches under movement and recovers afterwards. Available torch-applied and self-adhesive.
On an actual building
Where a substrate moves — expansion joints, long spans, dynamic details — SBS survives the movement that would permanently deform an APP sheet.
What we most often have to correct
That self-adhesive means less preparation. It bonds to whatever is on the surface, so if that is dust, it bonds to dust and lifts at the edges.
Where this comes up in our work
Terms that come up alongside this one
- APP Membrane
Atactic-polypropylene-modified bitumen sheet, torch-applied to a primed substrate with lapped and sealed joints.
- Expansion Joint
A deliberate gap through a structure that allows adjacent parts to move independently under thermal and structural movement..
- Thermal Movement
Expansion and contraction of building materials as temperature changes.
SBS Membrane — questions we get asked
What does sbs membrane mean in waterproofing?
Styrene-butadiene-styrene-modified bitumen sheet. The SBS modifier makes it elastomeric, so it stretches under movement and recovers afterwards. Available torch-applied and self-adhesive.
Why does sbs membrane matter on a real project?
Where a substrate moves — expansion joints, long spans, dynamic details — SBS survives the movement that would permanently deform an APP sheet.
What do people commonly get wrong about sbs membrane?
That self-adhesive means less preparation. It bonds to whatever is on the surface, so if that is dust, it bonds to dust and lifts at the edges.
Have a building showing this?
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