Deck and Plaza Waterproofing

A traffic deck system is exposed and combines a bonded waterproof membrane with textured wear and top coats that carry vehicle or pedestrian traffic. A plaza system places the waterproof membrane below protection board, drainage composite, insulation where designed, and pavers, concrete, or landscaping. Harrowgate installs both assemblies and details their transitions.

Only when investigation confirms that the existing membrane is compatible, firmly bonded, dry, and structurally supported by sound concrete. Harrowgate performs adhesion trials and selective openings before recommending a recoat. Blistered, contaminated, brittle, or delaminated areas are removed to a stable edge, then rebuilt within the specified system.

We remove failed material around the drain, repair the concrete throat, confirm the drain body and clamping components, and install the membrane into the approved drain detail. Reinforcement and extra coating build are placed around the perimeter. The grate, ring, and adjacent deck are set so water reaches the outlet without ponding.

Closure depends on repair mortar cure, membrane chemistry, temperature, humidity, number of coats, and traffic type. A localized recoating phase may return sooner than a full-depth concrete repair and complete membrane rebuild. Harrowgate provides a zone-by-zone sequence showing preparation, coating, cure, line marking, and planned traffic release times.

A continuous membrane stops water entering through the treated field, but leakage can bypass it through expansion joints, walls, drains, conduits, curbs, or adjacent untreated zones. We trace the source and include those interfaces in the scope. Structural cracks and failed drainage are repaired as causes, not covered by an isolated surface coat.

The deck must be sound, clean, dry within product limits, and mechanically profiled. Harrowgate removes laitance, oil, rubber, weak coatings, curing compounds, and unsound repairs by shot blasting, grinding, or scarifying. Cracks, spalls, and bugholes are repaired, then dust is extracted before primer and detail coats are installed.

Yes. We create phases around traffic circulation, fire routes, loading schedules, drainage areas, and coating cure times. Temporary boundaries are placed at logical details, not through wet material. Each phase includes access control, ventilation, surface preparation, inspection, coating, cure, markings, and reopening before the next zone is isolated.