ᐅ The underfloor heating system has a kink after the repair.

To install the drain for a walk-in shower, some space had to be made in the concrete slab, which damaged the underfloor heating. During the repair using a coupling, it seems a kink occurred in the pipe. My site manager says it’s not a problem. The pipe has already passed a pressure test successfully. I have now requested that the plumber provide a written statement confirming that the kink does not affect the warranty of the underfloor heating system. This was on Friday, and I have not yet received a response... What do you think?

Regards,
Robin

I find it more unusual that the reinforcement is exposed...

It is a prefabricated concrete slab, meaning the underfloor heating is embedded in the concrete and there is no screed layer.

In our case, the upper floor was also assembled using prefabricated elements, but during the lowering process, one panel caused the connection hose to kink.

I didn’t even notice it at first. A few days later, the pipe was generously exposed and a new connection was made. I asked the installer why, and he said he couldn’t be sure that the kink wouldn’t cause a leak, especially under the concrete. It’s better to fix it now than to risk losing pressure suddenly during the pressure test once everything is finished.

Talk to the construction manager about this and ask for an extended warranty of 10 to 15 years, for example. If he refuses, then it should be redone. Alternatively, if you know the pipe manufacturers, you could inquire with them as well.

There are minimum bend radii for these pipes that must be strictly observed. What exactly happens otherwise, I’m not sure, but it definitely results in a reduction of the cross-sectional area. Just try googling what happens when an aluminum composite pipe is kinked.

According to the manufacturer, dents are acceptable, but bends are not. In their opinion, this is a bend. After the concern was raised, the plumber decided to replace it. Hopefully, this will happen soon, as the subsequent trades will have to wait until then.