Last year my gas plumber got rid of the old fashion immersion tank and replace with a new combi boiler in the attic. It been great as it is out of the way, more efficient and the hot water pressure is perfect. But I notice in winter I get condensation builds up in the attic! I live in a terrace house and do not have underfelt under the roof-slates, therefore the cold slates and a warm boiler builds up condensation during winter!!
I'm thinking of having underfelt putting in by professional roofer. The underfelt is 'breathable' and hopes this will solve the problem (??)
I've lived here for over 12 years and never had this problem until new combi boiler fitted in attic a year ago and thats when it started to build condensation in attic. I'm sure the causes is the boiler making the attic warm and then when the heating is off, the air cool down it builds condensation against the cold slates (??)
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