Holidays come from missed areas, pinholes over bugholes, outgassing, skips at overlapping passes and roller drag. Small as they are, each one is a leak path. On fluid-applied membranes inspectors look for them by eye, with wet film gauges and with spark testers on conductive substrates. Holidays are marked and recoated before protection goes on.
Spark tester found three holidays at the drain bowls, mark them in paint and hit them with another coat.
Also heard as
- pinhole
- skip
- void
Related terms
Fluid-applied membrane
A liquid waterproofing applied by roller, squeegee or spray that cures into a continuous rubbery film with no laps.
Bugholes
Small surface voids in formed concrete left by trapped air bubbles against the formwork.
ELD
Electronic leak detection, using a small electric current to pinpoint breaches in a membrane.
Outgassing
Gas escaping into curing sealant or membrane from punctured rod or damp concrete, leaving bubbles and pinholes.
Same word, different worlds
Pinhole, void or bare spot in a coating that leaves the metal underneath exposed.
Powder CoatingA skip, void or pinhole in the coating where bare metal is exposed.
Hydrography & ChartingA gap in survey coverage where no data was collected, which must be filled before the survey is complete.