Roof waterproofing
Torch-on and self-adhered bituminous membranes, TPO/PVC single-ply, liquid-applied membranes (PU, acrylic, PUA/polyurea), inverted roofs. Critical details: falls, outlets, upstands, penetrations and protection.
Waterproofing solutions
Waterproofing engineering — select, specify and verify
Most waterproofing failures are detailing and workmanship failures, not product failures. We help owners and MCSTs choose an appropriate system, specify it properly and verify the installed work.
Wet areas (bathrooms, kitchens, balconies)
Cementitious and polymer membranes under tiles, with bond breakers at wall–floor junctions, sleeves at penetrations and flood testing before tiling.
Basement waterproofing
Design by protection type: barrier (Type A), structurally integral (Type B) and drained cavity (Type C), selected for the required internal environment grade (BS 8102:2022).
Injection grouting
PU foam/resin for active water stopping, epoxy for structural crack bonding, acrylic gels for curtain grouting behind structures.
Façade waterproofing
Sealant joints, window perimeters, flashings and coatings. Sealant selection by movement capability, substrate and primer compatibility.
Concrete repair
Repair of spalling and cracking to restore cover and integrity before re-waterproofing (EN 1504 principles).
What a good waterproofing specification covers
- Substrate preparation and moisture limits
- System build-up, thickness and laps
- Detailing at outlets, upstands, penetrations and movement joints
- Protection and finishes
- Hold points, inspection and testing (flood test, adhesion, ELD where suitable)
- Warranty terms and maintenance requirements
Members can download a specification outline, method statement and ITP templates.
Planning a waterproofing project?
Email pe@qp.sg or WhatsApp +65 9800 4385 with photos, location and how long the leak has been occurring.