Hello, our house was built in '63 and currently has a sub-roof of masonite and then concrete tiles. A crumbling chimney and leaky penetrations make us consider redoing the roof and removing the chimney to replace it with mechanical exhaust ventilation.
The problem we have is the lack of a vapor barrier on the upper floor and 140 mm insulation in the roof and walls (sloped ceilings and knee walls). We currently don't have any moisture problems in the attic except for the leaking penetrations. So the question is, should we replace the masonite with tongue-and-groove boards, which are extremely sensitive to moisture, and tight roofing felt (possibly vapor open) or should we lay new masonite similar to the old one that's held up well for 60 years??
The problem we have is the lack of a vapor barrier on the upper floor and 140 mm insulation in the roof and walls (sloped ceilings and knee walls). We currently don't have any moisture problems in the attic except for the leaking penetrations. So the question is, should we replace the masonite with tongue-and-groove boards, which are extremely sensitive to moisture, and tight roofing felt (possibly vapor open) or should we lay new masonite similar to the old one that's held up well for 60 years??
With the absence of a diff lock internally, I don't think it's a good idea to insulate more as it would lower the temperature outside the insulation and increase the risk of condensation within the insulation or on the undersheathing.
