Mulling over the possibility of doing a loft conversion. Very early days and probably not till next spring.
House built in 1925 with a plain tile roof in good condition. A dormer will be on the back, but I was wondering if I can simply put the required amount of PIR in between the rafters from inside as the roof is original and has no felt/breathable membrane under the tiles. Don’t fancy stripping a good roof. Also, I’m aware for flat roofs, 120mm is required, what’s it for lofts? What about air gap or can I simply push PIR up to the battens?
cheers
House built in 1925 with a plain tile roof in good condition. A dormer will be on the back, but I was wondering if I can simply put the required amount of PIR in between the rafters from inside as the roof is original and has no felt/breathable membrane under the tiles. Don’t fancy stripping a good roof. Also, I’m aware for flat roofs, 120mm is required, what’s it for lofts? What about air gap or can I simply push PIR up to the battens?
cheers