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A waterproofing system is only as reliable as its weakest pinhole. Acceptance testing exists to find those defects before the system is buried, screeded, or returned to service. Specifying and executing a complete QA/QC plan is the most cost-effective insurance available on any waterproofing scope.
Substrate inspection
- Visual inspection for soundness, dust, contamination.
- Moisture test — calcium chloride (ASTM F1869) or relative humidity probe (ASTM F2170).
- Surface profile against ICRI CSP guide chips.
- Concrete tensile strength via pull-off (ASTM C1583), minimum 1.5 MPa typical.
During application
- Wet-film thickness (WFT) using comb gauge each spray pass.
- Ambient and substrate temperature, relative humidity, dew point — logged at the start of each shift.
- Equipment temperature and pressure — both A and B sides for plural-component spray.
After cure
- Dry-film thickness (DFT) by magnetic gauge — minimum 90% of specified, no point below 80%.
- Pull-off adhesion (ASTM D4541) — typical acceptance ≥ 1.5 MPa on concrete with cohesive concrete failure.
- Holiday / pinhole detection — low-voltage wet sponge for thin films, high-voltage spark for membranes > 0.5 mm.
- Hardness (Shore A or D) where elastomer performance is specified.
Flood testing
A 48-hour flood test under a minimum 50 mm head of water remains the definitive acceptance test for horizontal waterproofing. Test plan, dam construction, water depth verification, and leak monitoring all need to be documented and witnessed.
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