Hello I am replacing the roof boarding (Sarking as we call it in Scotland) and replacing with engineered (T&G) OSB3. Do I need to use a breathable vapour barrier and if yes - does it go under or over the OSB? The covering will then be felted and slated. Much appreciate any help or advice on this one. Regarding the vapour barrier if needed, what one to choose?
Regards
Firkin
Regards
Firkin