Tap-water pipes: joints, leak indication and distribution cabinets

The governing idea behind Säker Vatten pipework is simple: a joint should never be hidden where a leak could rot the building unseen. Every detail below follows from that.

Concealed runs are jointless

Pipework that is concealed and cannot be inspected — in a shaft, wall, joist or behind fixed fittings — must be installed without joints. Joints are only allowed where they can be reached and where leaking water is easy to detect: in rooms with a waterproofed floor, in distribution cabinets, in special enclosures, or above false ceilings and in drained ceiling cabinets above waterproofed-floor spaces.

Distribution cabinets and service openings

Cabinets and built-in joint enclosures must have easily accessible service openings so joints can be repaired or replaced. A cabinet whose service opening sits in wet zone 1 must have a watertight hatch, tested and approved for connection to the wall's waterproofing — and it must not be placed in the area intended for the bath or shower.

The leak-indication rules (20 mm / 60 mm / 50 mm)

Built-in joint spaces must have a watertight bottom and a leak indicator. The specifics are precise and worth knowing:

• leak-indicator pipe inner diameter at least 20 mm;
• the outlet must sit at least 60 mm from the floor or wall waterproofing, and must not discharge into the bath or shower area;
• shaft walls must be waterproof to 50 mm above the bottom and fit tightly to it, with a level bottom so leaks run to the indicator;
• cabinets kept clean so indicators can't block.

Leak indicators serving kitchen-only pipes may instead discharge onto a watertight surface in or under the kitchen units.

Limited exceptions

Joint-location rules relax for pipe runs in ceilings that are visible or behind removable panels in basements, offices, commercial premises, public spaces (stairwells, garages) and certain corridors — but never in habitable rooms.

Water service, meter and freeze protection

The incoming tap-water service to a house must be exchangeable, run in a conduit whose length extends beyond a 45° angle of repose from the foundation wall. The water meter follows Swedish Water & Wastewater Association placement and must not sit in outer-wall insulation. Tap-water and heating pipes must not run in unheated spaces or within the building's insulation; they belong on the warm side of the structure, inside the air seal. Outdoor spigots must drain themselves even with a hose attached, to avoid freezing.

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