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- 14 Jan 2021
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Hi, first post in here, after some guidance if possible. I’ve started building a low budget garden room, it doesn’t have to last forever so not spending silly money on one. The size is 3m x 6m (half of this space is just for storage) The walls are built from insulated cold room panels. I’ve got 4x2 roof joists at 600 centres.
Now the roof - I created the roof deck from old 18mm osb. I then wrapped in cheap breather membrane and have then fixed box profile metal sheets to the top. Left no air gap between membrane and metal. I know this is not usually a good idea due to condensation on the under side of the metal but the steel sheets are only 0.04mm thick, so flimsy as hell and didn’t want to fix onto battens (rattle in the wind) although I know that is the right way to do it. Do you think I can get away without an air gap for the size of the building?
Now the roof - I created the roof deck from old 18mm osb. I then wrapped in cheap breather membrane and have then fixed box profile metal sheets to the top. Left no air gap between membrane and metal. I know this is not usually a good idea due to condensation on the under side of the metal but the steel sheets are only 0.04mm thick, so flimsy as hell and didn’t want to fix onto battens (rattle in the wind) although I know that is the right way to do it. Do you think I can get away without an air gap for the size of the building?