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Thanks for that Alistair. I was not going to put in a seperate ceiling but use the pitched underside of ther roof as the ceiling, if this is the case, there will only be ventilation between the purlins underneath the corrugated outer roof. Would it be best to use a membrane in that instance? I...

Thanks Aaron, so basically the same principal as the walls. I guess any condensation will be dealt with by having opening windows and using trickle vents etc. Cheers, Ben

Hi all, Just joined the forum as I am building a garden office. I am using the method you suggest for walls Alastair. Cladding..horizontal! 25x50mm battens,,vertical building paper 9mm wbp ply (What do you think about substituting this for OSB3 9mm?) 100mm studwork 100mm full fill...