Expansion Joint Treatment
Every large structure needs room to expand and contract with temperature. Expansion joints provide that room — and need to stay both flexible and watertight.
What it is
Expansion joints are intentional gaps built into a structure to allow sections of concrete to expand and contract with temperature changes without cracking. They're sealed with flexible materials designed to stretch and compress repeatedly while still keeping water out.
How it works
The joint gap is cleaned and prepared, a backer rod is installed to control the depth of the sealant, and a flexible sealant — typically polyurethane or silicone-based — is applied over it. The sealant needs to remain elastic enough to move with the joint through repeated thermal cycles without tearing or losing adhesion.
When it's used
- Terraces, podiums and large exposed slabs with expansion joints from original construction
- Joints where the existing sealant has hardened, cracked or lost adhesion
- Building envelope junctions where two structural sections meet and move independently
Advantages
- Prevents cracking caused by thermal expansion and contraction
- Keeps a genuinely watertight seal at a point that moves constantly
- Extends the service life of the surrounding waterproofing system
Not sure which system your problem needs?
The right system depends on your specific site condition. Show us the problem and we'll confirm the right approach.
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