Boatfixer
Established Member
I'm in the process of putting up a lean to building to be used as a utility room. The walls are 4x2 studding and I was planning on (from inside to outside) plasterboard, stud wall filled with rockwool insulation, polythene vapour barrier, 2x1 to provide an air gap and shiplap on the outside. I'm now wondering if I should use ply or osb instead of the polythene sheeting to provide more rigidity as well as a vapour barrier or if I should be doing something else entirely..... I Have the studding up and the shiplap treated ready to go so I cant completely change things but now is the last chance to make any design changes.......