Cavity Wall Condensation Problem
- Thread starter fred812
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My house has several cold solid walls too, no condensation (except on windows in the bedroom) but then we have enough ventilation.
There is a choice: stay warm and risk ill health, or reduce the risk considerably by ventilating and wearing suitable clothes.
JohnD is right I'm afraid, and most condensation problems are cured by ventilation. The outside air might be more humid than inside, but then it is cooler. As soon as it comes indoors and warms up, its humidity drops, and it is then able to pick up moisture. All to do with vapour pressures.
There is a choice: stay warm and risk ill health, or reduce the risk considerably by ventilating and wearing suitable clothes.
JohnD is right I'm afraid, and most condensation problems are cured by ventilation. The outside air might be more humid than inside, but then it is cooler. As soon as it comes indoors and warms up, its humidity drops, and it is then able to pick up moisture. All to do with vapour pressures.
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Thanks, I do appreciate the discussion. When the cavity wall insulation was put in I was told that because of a construction issue in another part of the building that there was a risk of settlement of the insulation on that wall and that the risk of condensation at that point would be worse because of the cavity wall insulation, ie that condensation would be concentrated on fewer cold spots.
Its not that wall that has the problem, but I think it characteristic of blown fibre (Rockwool??) cavity wall insulation settling.
Thanks for the input.
Its not that wall that has the problem, but I think it characteristic of blown fibre (Rockwool??) cavity wall insulation settling.
Thanks for the input.
But not all, and I would agree not in this case.
Fair point. We do a bit on the older aluminium frames but only upstarirs. The toilet system is terrible. I have a demidifier which sits at about 60% most of the time.
The problem on the walls has developed over a number of years though.
The problem on the walls has developed over a number of years though.
Humidity is usually called "Relative Humidity" for a reason. It is temperature dependent. Air that is near 100% RH near 0ºC is a much lower percentage if the temperature of that air is raised to 20ºC. Conversely air near 100% RH at 20ºC will be dropping moisture if it is taken down to 0ºC. So your statement is incorrect. Did you mean warm air can hold more moisture?
I made another thread that explains some of the misconceptions about ventilation
//www.diynot.com/forums/building/condensation-discussion.350716/
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//www.diynot.com/forums/building/condensation-discussion.350716/
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