Pipe penetrations through the waterproofing layer

Every point where a pipe crosses the waterproof membrane is a designed detail in Säker Vatten — never an improvised hole. Floors and walls each have their own rules.

Through a waterproofed floor

No pipe may pass through a sealed bathroom or shower floor except a drain, and only floor drains are allowed in the bath or shower area itself. Holes are cut with no more than a 2 mm gap between the panel and the pipe. Where a transit sleeve is used (in a laundry, machine room, or a bathroom floor where no laundry exists — but never in the bath/shower area), it has a smooth surface matched to the floor sealing. A projecting waste pipe must sit at least 60 mm from the wall waterproofing, at least 100 mm from another sleeve, and at least 40 mm above the waterproofing underlay. The pipe is fixed in place before the waterproofing goes on, and the seal between pipe and membrane is made with the waterproofing contractor's own material.

Through a waterproofed wall

There must be no penetrations in the bath or shower area except the bath/shower mixer connections, or a penetration placed no lower than 2.0 m above the floor and at least 100 mm from the ceiling. Elsewhere, a pipe must sit at least 60 mm from the waterproofing in adjacent walls or floor. Conduits and plastic sheaths are cut 2 mm outside the finished wall, projecting pipes stand about 100 mm from the wall at a right angle, and the seal is made to the plastic sheath, conduit, wall box or steel pipe as appropriate. As on the floor, the pipe is fastened before the waterproofing so nothing moves later.

These clearances exist so the waterproofing contractor can form a proper, tested seal around each penetration — the single most common place a wet room leaks.

Official source: this is M5's plain-language summary, not the official text. For the full rules see Säker Vatten (sakervatten.se).