Not every commercial water leak starts with a damaged roof or failed waterproofing membrane. Sometimes the problem is an expansion joint that has lost its seal.
Expansion joints are intentionally installed between sections of a structure so the building can move without uncontrolled cracking. Because these joints create openings through the building envelope, they also need a flexible and durable sealing system.
A properly installed expansion joint seal can:
Reduce rainwater and moisture ingress Accommodate thermal and structural movement Protect concrete and reinforcement from prolonged moisture exposure Help maintain fire-rated separations where required Reduce uncontrolled air leakage Prevent dirt, pests, and debris entering cavities Reduce trip hazards around pedestrian areas Extend the service life of surrounding building materials
Successful expansion joint waterproofing isn't simply about applying more sealant over an old joint. Existing material may need to be removed, substrates cleaned and prepared, backing rods installed at the correct depth, primers applied where required, and a suitable flexible sealant selected for the joint's expected movement.
For commercial buildings on the Gold Coast, correctly maintained expansion joints can make a significant difference to long-term waterproofing performance.