I'm in the middle of some alterations on my bungalow and have a few dilemmas, here's one of them!
The back of the bungalow has a 7.5m x 4m roof which is has a 4.5 degree pitch and is topped with rubber over non breathable old style felt over plywood. I Want to insulate it but am not sure if I'll need a moisture barrier or not!
The rafters are 100mm deep so I was going to use 50mm celotex flush with bottom of rafters then fix foil backed plasterboard before skimming, I'll drill holes through the rafters to allow cross ventilation and fit circular soffit vents wher I can. There is also a 4.8m glass roofed utility room across part of this room so I'll only have 2.7m length of soffit to vent!
So based on this set up will I need a moisture barrier?
Will there be enough ventilation?
Any advice appreciated
The back of the bungalow has a 7.5m x 4m roof which is has a 4.5 degree pitch and is topped with rubber over non breathable old style felt over plywood. I Want to insulate it but am not sure if I'll need a moisture barrier or not!
The rafters are 100mm deep so I was going to use 50mm celotex flush with bottom of rafters then fix foil backed plasterboard before skimming, I'll drill holes through the rafters to allow cross ventilation and fit circular soffit vents wher I can. There is also a 4.8m glass roofed utility room across part of this room so I'll only have 2.7m length of soffit to vent!
So based on this set up will I need a moisture barrier?
Will there be enough ventilation?
Any advice appreciated