Possible defects in installed controlled residential ventilation pipes - concreting will be done today

Hello everyone,

I urgently need an assessment from someone with a bit of experience in controlled residential ventilation regarding the installation.

Yesterday afternoon, the pipes were laid in the ceiling, the upper iron layer is currently being placed, and the concrete will be poured this afternoon.

I checked all the ducts yesterday evening to see if they were okay. I discovered two things:

1. Hole in the pipe: however, you cannot see inside the pipe, so I assume the pipe has an outer and an inner wall and the hole does not go through the inner wall.
Question here, how "serious" is this: does the section of pipe need to be replaced, is simply taping it with duct tape or similar enough, or is it merely cosmetic and can be concreted over like this?

2. Valve treated with tape: on all other valves, the pipe in the valve is not additionally wrapped with tape; moreover, on the other valves, the second connection is closed with a plastic cap, whereas here tape was used instead. Presumably, a lock is damaged and the mentioned cap is missing.
Again, the question is how "serious" this is: does the valve need to be replaced, or is this just a pragmatic fix that can remain as is?

Unfortunately, my installer has been unreachable since yesterday late afternoon, and according to the office, he is out all day today. The office is trying to reach him and also has the pictures I already emailed yesterday, but I am currently wondering what I will do if the concrete arrives this afternoon before the installer can take a position. In an emergency, I will have to tape the hole myself with duct tape, better than nothing. Also, it is to be feared that more holes might appear after laying the upper iron layer that I would then have to take care of.

Thank you for your help.

That is all uncritical. As you have noticed, there is an inner and outer pipe. You can possibly patch it again with duct tape, but it should not pose a problem as it is.

For the valve, a cap would of course be the right decision, but the execution will also hold. The pipe was probably not properly sealed and that’s why the tape and the other end is like that due to the missing cap. You can open it again and put a piece of styrofoam in front and then seal it again with tape.

You probably won't be able to get a cap quickly either.

Thank you for the reassuring information. :)

The boss has meanwhile had the office lady convey that the hole is unsightly and someone will come to patch it before it is concreted this afternoon.

However, everything is fine with the valve. Maybe the cover is also beneath the valve, as it sits 5 cm further inside, but I didn't want to check because then I would have had to break the seal.

I would rather be concerned that the pipes are in the ceiling and not on it, but that is probably common practice nowadays. Besides that: The pipe will still be completely encased in concrete. So what could happen? It will definitely be airtight then.

Best regards

K1300S

Why worry?

It has certainly been calculated, the pipes are usually concrete-strong, so where is the problem?

I would rather be concerned that the pipes lie in the ceiling and not on it, but that seems to be common practice nowadays. Apart from that: The pipe will still be completely concreted in. So what could happen? It will definitely be airtight then.

Best regards

K1300S

In new buildings, according to my research, this is concreted in much more often than laid on the ceiling.

What could happen? That concrete flows in if the hole was not or not properly patched. I just got a call again that the hole is patched and really had to be patched. So I am relieved for now. :)