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I am trying to insulate a cold room in a 1900s house that has drafts coming up from a cavity beneath. The floors have been stripped and there is large gap under the skirting board that is about 5-8mm high and goes back about 20-50mm. I want to prevent the air from coming up from the cavity...

I've been having similar issues in a similar room and house. I'm seeing only 1 degree C rise per hour. E.g. 15C start to 18c in 3 hours with very mild 11C outside. Interestingly it takes about 10 hours to go back to 15C after the heating is switched off - so can't be entirely due to...