ᐅ Electrical cable fastening/nail driven through bitumen waterproofing membrane
Created on: 29 May 2016 04:32
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xyztestuser
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.
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.
K
Knallkörper2 Oct 2017 11:46The ground beneath the slab is damp. Waterproof concrete is not vapor-tight. There is usually a vapor-proof layer between the insulation and the screed. Therefore, if there is no bitumen roofing membrane, the floor structure will always have elevated moisture levels.
W
winnetou782 Oct 2017 12:05Isn’t the capillary-breaking layer meant to prevent that?
K
Knallkörper2 Oct 2017 12:08No, the capillary break layer only prevents liquid water from rising beneath the concrete slab. It has nothing to do with vapor.
W
winnetou782 Oct 2017 12:09Ok,
So, that means you are not allowed to fasten pipes with nails or screws.
But in practice, you often see exactly that.
So, that means you are not allowed to fasten pipes with nails or screws.
But in practice, you often see exactly that.
Knallkörper schrieb:
WU concrete is not diffusion-tight.If it is installed according to the standards, it is!
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