Backyard studio roof detail
I’m in the process of converting/rebuilding a backyard building into a conditioned studio space for a client. The building is located in SW Ohio, climate zone 4A. It is not classified as an inhabitable building, but I’m doing my best to make sure it’s durable and comfortable. I’m also using it as a bit of a test bed to for improving my building techniques.
My question is how to address the roof assembly. It is possibly best described as a “Quasi-Cathedral” ceiling with 2×4 trusses. The ceiling is detailed to follow the truss outline to provide additional ceiling height. Where the roof approaches the eaves, there is minimal room for insulation. This is certainly less than ideal, but has been allowed since this is an uninhabitable accessory building. I may be able to fur down slightly to boost R-value, but not enough to get to code. Re-roofing is not in the current scope.
My question is whether to add ventilation chutes or not. I’m thinking some site built channels (7/16″ osb or 1/4″ luan), might help to mitigate potential moisture issues on the back of the roof sheathing. This would have a trade-off of reduce insulation space in the rafter bay.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part