I have a long, 'tandem' garage attached to my house. The wall to the left is my house wall so is a cavity wall. The wall to the right is a single skin brick wall (100mm wide). I shall be dividing the garage in half with a stud wall and plan to put insulation between the roof joists (flat roof) with a plasterboard ceiling.
I wish to use the garage as a gym / 'chill out' room so would like to make it a bit warmer. I should add there will be a spa in there also, so a bit of moisture generated from that.
I've tried to find information on the internet and it all seems to contradict itself, so I thought I'd asks the experts on this forum!
Various websites say that I have to put a damp proof membrane against the wall before I attach the insulation, but others say that I do not need this and the insulation board can fix directly to the wall with no damp proof membrane. Some suggest forming a small cavity using battens.
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