Fancy do can be expensive

Wall mounted doors are mounted with the cistern inside the wall, making watercases difficult to detect.

Fancy do can be expensive

Wall-mounted toilets have become more popular in recent years, but according to Ole Larmerud, Technical Director at Norske Rørleggerbedrifters Landsforening, most wall-mounted toilets are not fitted according to the regulations.

– Incorrect installation causes water damage to become visible before it’s too late, he says to the magazine We in Villa.

– There are very many wall-mounted toilets where the cistern is mounted on the wrong side of the membrane. We therefore recommend that you first build the wet room and then crate into the cistern, “says the general manager of the wet room (FFV), Lars Gulbrandsen.

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Simple Maintenance Requirements

According to technical regulations, sanitary facilities must be carried out so that leakages can be easily detected and that parts can easily be replaced. When the toilet is hung on the wall and the cistern is hidden inside, both maintenance and availability are hampered.

– Built-in toilets built in violation of the regulations will therefore be illegal, says Lars-Erik Fiskum at the Water Damage Office.

It may be very expensive if you have to get to a cistern hidden in the wall, “says Lars Gulbrandsen. – At worst, you may risk ripping the entire room.

By mounting the wall-hanging toilet after the wet room has been completed, Gulbrandsen will have a much easier availability at leakage.

– All you need is to tear the box around.

According to Byggebransjens våmmetormorm (BVN), it is recommended to have a small layer of extra bathroom tiles, so as to avoid having to replace all tiles.

Also read: Water Squash Suite

Easily visible leaks

Another requirement at sanitary facilities is that any leaks should be easily detected. This is difficult if the cistern is built into the wall. A leak can lie and “make good” look long before it becomes visible, and then the probability is high for the water damage to be extensive. A minimum requirement for choosing the built-in cistern is therefore to establish a so-called drainage opening. In case of a leak, the water will quickly become visible on the bathroom floor.

The challenge with a built-in sieve will nevertheless be a solution that makes it easy to get it, either from the backside or by cutting out a part of the wall, “says Gulbrandsen.

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Mounting options

Fancy do can be expensive

Wall-mounted closet with installation wall and drain opening Photo: Ill: SINTEF Building Research

According to the branch office for wet rooms and Lars Gulbrandsen, the recommendation is to throw in the cistern, as it is called. This means that the toilet bowl and cistern is hung on the outside of a finished wet room wall, either as an installation wall or as a pipe cassette. See

Another solution if you choose the built-in variant is to use a so-called cistern box. It works by draining water from a possible leak into the box and looking out on the floor.

The entire wet-rate for so-called insulator inserts for bulkheads (BNV 42.410) is available from FFV. On CD it costs 1500 kroner, while the price for the paper version is 2125 kroner. The norm is also available on the internet for NOK 1750.

Fancy do can be expensive

Wall-mounted closets Photo: SINTEF Building Research

plumbing check

According to figures from the Insurance Industry Association, there are three to four per cent of the Norwegian building stock water damage each year. Insurance companies offer a premium discount if you carry out a so-called plumbing check, which means that the pipeline will go up with a plumber with a few years’ space.

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