ᐅ Electrical cable fastening/nail driven through bitumen waterproofing membrane

Hello, we are currently building a single-family house with two full stories and no basement. On the ground floor, the architect specified a bitumen membrane with a thickness of 0.5cm (0.2 inches), which has already been installed. This week, the electricians were on site and laid network cables, satellite cables, and some electrical wiring inside conduit pipes on the ground floor, directly on top of the bitumen membrane. These conduits were secured individually or bundled together with fastening tape. Nails were driven through the fastening tape and the bitumen membrane.

Now my question is: Is this allowed, and if not, where is this specified in the relevant standards or regulations? Under what conditions would such an installation be permitted? If the bitumen membrane is damaged, wouldn’t it have been better not to install it in the first place, or am I misunderstanding something?

A few more details: The concrete slab is 20cm (8 inches) thick, and beneath it is a gravel layer approximately 65cm (26 inches) thick.

Thank you for your answers.

It is allowed because it concerns water vapor – there is even debate about whether the membranes are still necessary at all.

This is not about waterproofing like with a tanked basement.

A few penetrations don’t matter – you can of course apply a bit of bitumen on top.

My electrician attached the pipes using a hot air blower – though he wasn’t required to do so.

I am now considering extensively sealing the spots where the waterproofing membrane is penetrated (nail + metal strip) with a thick bituminous coating. Is this a reasonable alternative, and should I have it done by the responsible party? I would also do it myself.

When you feel better then...

xyztestuser schrieb:
Is this allowed

Please ask your architect and share their response with us. Personally, I think this is a typical case of substandard work... Completely acceptable, proven thousands of times, yet somehow still wrong. So, just smear some bitumen over it and that’s that. Whether the electrician does it or you do depends on your architect’s answer and whether you want it just done or done properly.

And why is it shoddy?