Liquid Membrane Waterproofing

Not in the rain, and not below the manufacturer's minimum temperature. The substrate has to be dry and above dew point. PMMA systems cure fast enough to walk in about an hour and take traffic the same day. Polyurethane cures slowly and is sensitive to trapped moisture, which blisters the film. Polyurea cures very fast but is spray applied and needs tight substrate preparation.

Sometimes. Adhesion and moisture decide it. We assess adhesion and check for trapped moisture in the existing build up, because coating over a wet assembly traps water and causes blisters. Loose, chalking or oily surfaces come off. Asphaltic surfaces can bleed through some resins, so a barrier primer or full removal may be needed.

It matters more than almost anything else. The system is sold by coverage rate, and cutting that rate to save material is where waterproofing quietly disappears. Thickness follows the manufacturer's specified coverage rate, lighter on pedestrian decks and heavier on vehicular parkades, with detail areas built up further. Thickness cannot be judged by eye, so coverage is tracked against the material used.

Torch-on suits large open roof fields where it can be rolled out efficiently, and it is a proven two-ply assembly. Liquid membrane earns its place where a roof or deck is cut up with penetrations, curbs, planters and drains, where torching is a fire risk near combustible walls, or where a walking or driving surface is needed on top. CL Roofing and Renovations installs both, so the choice comes down to the deck. For the specifics of each system we install, see parkade waterproofing and flat deck waterproofing.

We serve British Columbia, Alberta and Texas. Our core service area is Metro Vancouver, including West Vancouver, North Vancouver, Burnaby, and Langley.