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Pipe penetration waterproofing. Welded, not glued.
·1 min read·FORSPEC Technical Team
The short version
- Each detail piece around a pipe is heat welded to the floor sheet and to the piece beside it.
- The floor and its details end up as one welded membrane.
- Every weld is probed before the floor is tested.
Pipes, wastes and corners are where a membrane is cut, turned and joined. They are also where most leaks begin. On an ACTFLEX 900R floor those joins are welded.
FORSPEC on Instagram · 5 Nov 2026Pipe details welded into the sheetLoads when you tapHow a detail is made
- Corners, penetrations and the floor waste are formed from cut strips of the sheet, 200 to 300 mm wide, or from ACTFLEX SA TAPE.
- Every detail piece is welded to the floor sheet with hot air.
- Each weld is probed along its full length.
After the probe test the floor can be flood tested from 1 hour after installation: 50 mm deep for 24 hours. Tiles or screed go on once the test passes.
The standard drawings for penetrations are in the drawings library.
Where this comes from
Systems, products and drawings
SystemInternal Wet Area WaterproofingThe full build-up, layer by layer→ProductACTFLEX 900RDual-fabric butyl rubber sheet membrane for showers, bathrooms and laundries, with a consistent factory-controlled 0.9 mm gauge.→ProductACTFLEX SA TAPESelf-adhesive butyl sealing tape that reinforces junctions, penetrations and floor wastes inside FORSPEC liquid waterproofing systems.→DrawingB114 · Tap PenetrationCAD detail: PDF and DXF→RangeAll FORSPEC productsBy system, with data sheets and calculators→
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