How best to seal the hole with the cable running through it so it doesn't draw moisture into the walls?

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I would like to run an underground cable (5x6 mm²) outside. To do this, I need to drill a 2 cm wide hole in the basement wall to run it outside.

This will all be done below ground level. All I know so far is that I need to drill from the inside to the outside downward, so that water doesn't get into the cellar every time it rains.

Now the question is how best to seal the hole with the cable running through it so it doesn't draw moisture into the walls. I would not want to drill a 10 cm diameter hole to seal it with an O-ring seal. There would be no soil in front of the hole, but a gravel pit.

Answer

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Instead of sealing the annulus, there are also wall penetrations for individual pipes that are further sealed with well foam and bituminous paint. For example, google 3M WMD 16/8 heat shrink wall ducting.

  • That in itself looks like a good solution. But is it really important to use such a supply system? Can't you just make a hole the same size as the diameter of the cable, run the cable right through it, and then seal it with foam on the inside and bitumen on the outside?
  • You can, but then it would be a shoddy job. What if your gravel pit fills up during a heavy rain and water rushes into the basement? Better to do it right now and have peace of mind in the long run. A professional can drill a core hole for about $70, and sealing the backfill space costs about the same.
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