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Old 12.08.2020, 10:39
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amogles amogles is offline
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Re: Help needed - drill holes in concrete wall

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Is depending how thick is the concrete wall if is under 200mm will condensate and then is needed a breathable membrane and isolation installed with gap from the wall, with top and bottom ventilation...
I live in a building built in 1970. The load bearing walls all appear to be cast concrete, with only the interior partition walls being of lighter brick.

We had a lot of condensation problems until about 10 years ago when the house had a membrane and cladding put on the exterior and the difference was like night and day. For example, before the membrane, mould would appear on the back of furniture so we had to re-arrange it so that as little furniture as possible was stood against exterior walls, or where it was unavoidable, leave a significant air gap. All these problems are no more.

Strangely though, heating costs are only down marginally, much less than the landlord predicted, so the membrane appears to be doing more for the condensation than for the actual loss of heat.
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