Hi there
Insulating our extension with 150mm foil backed boards between the rafters, but due to some obstructions they will stick out past the rafters. We then plan on screwing 50mm insulation backed plasterboard over this. There will therefore be a void where the rafters are. Does this need to be filled? Quick sketch of a cross section to hopefully help explain the above.
Insulating our extension with 150mm foil backed boards between the rafters, but due to some obstructions they will stick out past the rafters. We then plan on screwing 50mm insulation backed plasterboard over this. There will therefore be a void where the rafters are. Does this need to be filled? Quick sketch of a cross section to hopefully help explain the above.