Key point
Trafficable car park waterproofing combines a suitable protective membrane, a compatible wearing surface and continuous details at joints, outlets and upstands. Diagnosing the water route is essential.
CarParkCoatings.com · Updated · Technical planning guidance
Form a continuous protective layer
A suitable membrane limits water penetration through the deck within the selected system’s design conditions. The wearing surface protects it against the expected traffic.
Resolve weak interfaces
Joints, outlets, penetrations and wall junctions are potential water paths. Agree compatible details and identify whether existing drainage or falls need separate work.
Check the cause of leakage
Water may come from joints, cracks or other parts of the structure. Establish the route of ingress before treating the open deck surface as the complete solution.
Specification evidence
Request current technical data for the proposed complete system. Confirm the relevant preparation method, moisture limits, movement capability, layer build-up, surface texture, application conditions and return-to-service requirements before installation.
Published by CarParkCoatings.com. Updated 2 October 2026. General planning guidance. Performance, layer thicknesses, curing times and testing requirements must be established for the selected system. This guide does not endorse a named manufacturer or replace a project-specific specification.