Expansion Joints
Waterproofing across movement joints — high-elongation SBS details that flex with the structure instead of fighting it.
One System, Built to Work Together.
Expansion joints exist because the structure moves — thermally, under load, between phases. The waterproofing that crosses them has to absorb that movement continuously without fatigue, which a field membrane laid flat across the gap was never designed to do.
Insutech details joints with high-elongation SBS membrane strips installed as a loop over a backer rod, welded into the field membrane on both sides. The detail moves with the joint while the waterproofing line stays continuous.
- Podium and parking deck joints
- Roof and slab movement joints
- Bridge and infrastructure joints
- Precast and phased-pour junctions
- Basement wall and raft joints
See the System in Action.
Layer by Layer.
- 01
Joint Preparation
Joint edges cleaned and made good, with the gap filled by a compressible backer rod.
- 02
Bituminous Primer
Both joint faces primed to guarantee adhesion of the detail strip.
- 03
SBS Detail Strip
A high-elongation SBS strip is looped over the joint with slack left to absorb movement.
- 04
Field Membrane Tie-In
The main membrane is torch-welded onto the strip on either side, keeping the waterproofing line unbroken.
- 05
Protection & Cover
Protection board or a cover plate shields the detail from traffic and following trades.
01Moves Without Tearing
Elastomeric SBS membranes elongate and recover through repeated movement cycles at the joint.
02Continuous Waterproofing Line
The joint detail welds into the field membrane — no cold gap at the structure's most vulnerable point.
03A Defined Detail
Backer rod, loop and tie-in follow a specified build-up, replacing improvised site solutions.
04Certified Manufacture
CE-marked, ISO-certified production behind every detail strip on the project.