New Roof
Vaulted Ceiling
8"x2" (203mmx50.8mm) Joists
I plan to leave a 50 mm airgap and then use 110mm Celotex XR4000 Insulation Board.
Do I also need to leave an airgap between plasterboard and Celotex? I assume not?
I may consider using 150mm Celotex XR4000 Insulation Board if no airgap is required on the plasterboard side.
Thanks
Vaulted Ceiling
8"x2" (203mmx50.8mm) Joists
I plan to leave a 50 mm airgap and then use 110mm Celotex XR4000 Insulation Board.
Do I also need to leave an airgap between plasterboard and Celotex? I assume not?
I may consider using 150mm Celotex XR4000 Insulation Board if no airgap is required on the plasterboard side.
Thanks