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Bathroom floor waterproofing. Ready an hour after the sheet.

1 min readFORSPEC Technical Team

The short version

  • A bathroom floor sheeted in ACTFLEX 900R butyl rubber.
  • The sheet is glued down, every lap is heat welded, and every weld is probe tested.
  • ACTFLEX 900R can be tiled, screeded or flood tested from 1 hour after it is installed.

A liquid membrane needs time between coats and time to cure. A sheet does not. That is the point of ACTFLEX 900R on a bathroom floor: once the last weld is probed, the floor is no longer what the job is waiting on.

FORSPEC on Instagram · 4 Nov 2026A bathroom floor in ACTFLEX 900RLoads when you tap

How the floor went down

  1. ACTFLEX 302 ADHESIVE on both faces, left to go tacky, then the sheet bedded from one edge and rolled.
  2. The sheet run 150 mm up every wall.
  3. Every lap welded with hot air.
  4. Every weld probed, with extra care around the pipes and the flange.

The figures

Sheet
0.9 mm butyl rubber, fabric on both faces
Tile, screed or flood test
From 1 hour after installation
Flood test
50 mm deep for 24 hours
Primer
None on sound, dry floors

The walls on this job were coated in ACTFLEX 906 WPU, brought down over the sheet at the base, so the wall and the floor overlap.

Where this comes from

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Systems, products and drawings

SystemInternal Wet Area WaterproofingThe full build-up, layer by layerProductACTFLEX 900RDual-fabric butyl rubber sheet membrane for showers, bathrooms and laundries, with a consistent factory-controlled 0.9 mm gauge.ProductACTFLEX 906 WPUSingle-component water-based polyurethane membrane for wet areas and protected external areas beneath tiles and screeds.RangeAll FORSPEC productsBy system, with data sheets and calculators
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On site with FORSPEC

A lift pit lined before the pour, from FORSPEC on InstagramA lift pit lined before the pourThe membrane under the screed, from FORSPEC on InstagramThe membrane under the screedA pool detailed the right way, from FORSPEC on InstagramA pool detailed the right wayPipe details welded into the sheet, from FORSPEC on Instagram▶ 3.2KPipe details welded into the sheet
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