Hello everyone,
I want to install a few cables into our house.
Since the multi-utility wall entry is completely sealed and not accessible, I was thinking of drilling a hole just above it in the drip edge to pass the cables through. Outside, this would come out about 20 cm (8 inches) below ground level in the drip edge.
We have a cavity wall construction: facing brick, mineral wool insulation, and Poroton blocks.
My question is whether this approach is feasible? What should be considered regarding insulation and thermal bridging? Is there perhaps a specific building component designed for such purposes?
I’m hoping for some practical advice and helpful tips.
Best regards
I want to install a few cables into our house.
Since the multi-utility wall entry is completely sealed and not accessible, I was thinking of drilling a hole just above it in the drip edge to pass the cables through. Outside, this would come out about 20 cm (8 inches) below ground level in the drip edge.
We have a cavity wall construction: facing brick, mineral wool insulation, and Poroton blocks.
My question is whether this approach is feasible? What should be considered regarding insulation and thermal bridging? Is there perhaps a specific building component designed for such purposes?
I’m hoping for some practical advice and helpful tips.
Best regards
And a small addendum.
I just had a phone call with a friend to discuss the project. He is not a professional... he didn’t understand my problem and basically said I shouldn’t buy expensive special cable glands but just drill a hole, insert the cable, fill the gap with well foam, and that’s it.
That sounds tempting, of course... what are the drawbacks of this approach?
I just had a phone call with a friend to discuss the project. He is not a professional... he didn’t understand my problem and basically said I shouldn’t buy expensive special cable glands but just drill a hole, insert the cable, fill the gap with well foam, and that’s it.
That sounds tempting, of course... what are the drawbacks of this approach?
Roppo schrieb:
I was told not to buy expensive special cable glands, but just drill a hole, push the cable through, fill the gap behind with expanding foam, and that's it.
That sounds tempting... what are the drawbacks of this method? You can do it that way. However, it is still a thermal bridge... I'm pretty sure about that. With such a hole, it might only cost a few euros per year in heat loss. But it’s definitely simpler than using a proper cable gland. Otherwise, try googling "3m wmd 16/8." I’ve heard positive feedback about it several times, and the reviews on major online retailers are also promising. The price should be reasonable as well.
Oh yes, thank you very much, that’s a great suggestion!
But what exactly is the advantage compared to directly routing the cables?
Because I still have to foam the heat shrink tubing. And since I shrink everything at the end, I won’t be able to add any cables later on either.
However, there must be a reason why this product exists...
But what exactly is the advantage compared to directly routing the cables?
Because I still have to foam the heat shrink tubing. And since I shrink everything at the end, I won’t be able to add any cables later on either.
However, there must be a reason why this product exists...
Roppo schrieb:
But there must be a reason why this product exists... Just my layman’s opinion. But I know the heat-shrink technique from public utilities. Pipes or cables in the street are connected this way to extend or repair them. In that context, the adhesive is meant to prevent water ingress. I also checked again on the 3M website. It says the following:
The corrugated surface of the wall sleeve is coated with a special sealing material. This ensures a permanently waterproof seal when closing the penetration opening with mortar or cement. The package includes a polyolefin heat-shrink tube shrunk onto a supporting spiral, a cable cleaning cloth, and installation instructions. I can imagine that the connection between the cable outer sheath and the sealing material might not be optimal without the heat-shrink tube.
Roppo schrieb:
I also won’t be able to add any cables in the future. Here is something else from 3M:
Cables or pipes can also be pulled in at a later time, and installation as a reserved penetration is possible. You just have to install a second one alongside from the start.
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