ᐅ Water installation in drywall – done correctly?

Created on: 13 Jul 2023 14:24
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Harri_Bayer55
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Harri_Bayer55
13 Jul 2023 14:24
Hello everyone,
I have a question regarding the installation of pre-wall systems on drywall (see pictures). Our wall has double layers of plasterboard.

The upper mounting of the pre-wall frame is only fixed to the back wall using two simple wooden battens. Is this a common practice? Is this normal? It looks quite odd to me, more like patchwork than professional work, almost like shoddy construction. Don’t they usually use cross braces in such cases?

Two red insulated pipes run behind a wooden frame in a wall construction; installations visible.


Pre-wall installation for washbasin

Metal stud wall with red hot water pipe, blue cold water pipe, and drain pipe.

Backside of washbasin, attached with wooden battens

Vertical metal ruler on a brown background, flanked by wooden boards on the left and right.


Red and silver insulated pipes run through a wood and metal frame construction.


In the bathroom, a U-profile in the middle was cut out to attach the fittings. When I pull firmly on the fittings, the entire wall wobbles. That can’t be right, can it? I should mention that the drywall is currently installed on only one side so that the electrician can still work inside. It’s possible that once the other side is installed, it will be completely stable—I’m just not an expert.

Red electrical cables run through metal studs; a wooden holder secures them inside the wall opening.

Can anyone give me some advice?

Thank you very much!
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Harakiri
13 Jul 2023 14:49
The profile manufacturer would definitely have a panic attack — cutting out side walls is not allowed! If no alternative routing for the cables is possible, a crossover (lateral reinforcement) must be installed there.

Wooden furring strips are often used in the UK, but in your case it looks very improvised — there are actually better ready-made solutions, such as Leifeld UniBlock. Even better is fastening to CW studs, for example with clamping rails or similar (Leifeld also offers various systems for this).
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Harri_Bayer55
13 Jul 2023 15:07
Harakiri schrieb:

The profile manufacturer will definitely have a panic attack – cutting out side walls is not allowed! If no alternative routing for the cables is possible, a crossover reinforcement must be installed there.

Wooden bottom tracks are often used, but in your case it looks very improvised – there are actually better ready-made solutions, such as Leifeld UniBlock. Even better is fastening to metal stud profiles, for example with clamp mounting rails or similar (Leifeld also offers different systems).


Thank you, I will make sure the profile is replaced and done properly. I will take a look at the clamp mounting rails and order them. If necessary, I will install them myself.
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Harakiri
13 Jul 2023 16:30
It is probably too late for the clamping rails, as they usually need to be wrapped around the profiles – this must be done before the paneling.

In theory, you could angle a mounting rail to size, screw it to the profiles on the left and right, so that it ultimately provides the correct depth for the wall panels. However, the installers should actually be familiar with this and usually have the appropriate components readily available.
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Harri_Bayer55
2 Aug 2023 12:40
Thanks for the tip. I showed the problem to the drywall contractor, and after shaking his head, thankfully he was able to fix it. He added a reinforcement profile there. Hopefully, it will all hold up.