AIUI, if the temperature is lower then the air contains less water vapour. If a room is warmer, it follows the air could contain more water vapour. Wouldn't there be more chance of condensation forming on a cold surface?
This place I've bought has damp patches in the top corners of the main bedroom. I try to maintain the temperature in there at 15c overnight. There's 250mm of insulation in the loft and cavity wall insulation mortar plugs in the walls. I suspect the cavity wall insulation may have 'slumped', as there's no evidence of it in the loft. I'm wondering if it's polystyrene balls. I can't ask the previous owner as he's dead. We're going to have some windows replaced and hopefully get a peek into the cavity then.
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