Hi.
I have planned to add insulation to my cabin. I had a moisture expert visit, who assured me there should be no issues, but we didn't get into details about the construction other than 50cm of foam board and 12mm plywood work well on walls and roof.
I'm considering the existing interior wall, which today consists of something like a masonite board, not particularly stiff and about a mm thick, maybe 1.5. Glue on 50 mm of foam board with stone glue, then glue 12 mm plywood on top.
I believe that both the foam board and the plywood will carry their own weight on the wall as they will stand on the floor, plus I can screw it down into the floor and then cover it with molding. But in the ceiling, there won't be any molding, can I trust the glue here or should I sink two long screws at the top that go through everything into the wall stud?
I'm also a bit worried about the ceiling where I plan to do the same thing. Should I screw some battens into the ceiling joists and then clamp the foam board when I screw up the plywood? Will the air gap cause any problems in the future?
It would be great if you think it's feasible to glue everything onto the ceiling, but it would also be nice to keep the ceiling in the ceiling.
The wall is 2m high. The ceiling is a sloped roof extending from wall to peak, 1.85 on each side.
The boards are 1.22 x 2.44 m.
