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Hiya
I am building a workshop in my garden (approx. 6x2.5m) with teenager den at one end. Photo attached. It is timber framed (recycled 4x2 roof rafters), with timber external T&G cladding. I have bought 9mm ply for the inside walls and plan to insulate with Rockwool. It will have a pent roof (chipboard and felt). I have been given some old uPVC double glazed windows/doors which I will install. I have also been given a roll of breathable membrane and my plan was to wrap the building in it and clad over the top but now I am wondering if I ought to put 20mm battens between the membrane and the cladding. I am not looking for this workshop to last a lifetime. 10 years will be fine as we may move after the kids have (hopefully) flown the nest. What do people think? Is it necessary?
Also, if I batten what do you do with the corners, where the cladding meets. Presumable I need a timber in the corner to fix them to and seal the join? So I’ll need an extra wide batten at each corner?
Another question, is the 9mm ply considered to be a vapour barrier on the inside? If not, what is the cheapest form of vapour barrier? I was thinking of using DPM but that’s not that cheap.
Any advice/comments welcome.
Thanks.
Luigi