Christ it’s hard going to get started! Won’t go into the architect/SE design saga as I’ll just work myself up. Must be a boom on as I can’t give my money away!
It’s going to be self build so I’m using my energy to contemplate insulation. Getting mixed messages as to whether U values of the roof need to be 0.18 or 0.16. Which is correct?
Also type of insulation and method - typically PIR between rafters then a layer over the top before plasterboard. What thicknesses and where are the air gaps? My roof is sound but old and has no felt. Just plain tiles. 25mm between tile and insulation? Any gap between the full layer over the rafters and plasterboard?
what about this super quilt foil stuff? Looks easier. Again, mixed messages as to whether insulated plasterboard needs to go over the 2 layers you install.
advice on method, ease of installation and cheapest appreciated. (Cheapest is my language)
It’s going to be self build so I’m using my energy to contemplate insulation. Getting mixed messages as to whether U values of the roof need to be 0.18 or 0.16. Which is correct?
Also type of insulation and method - typically PIR between rafters then a layer over the top before plasterboard. What thicknesses and where are the air gaps? My roof is sound but old and has no felt. Just plain tiles. 25mm between tile and insulation? Any gap between the full layer over the rafters and plasterboard?
what about this super quilt foil stuff? Looks easier. Again, mixed messages as to whether insulated plasterboard needs to go over the 2 layers you install.
advice on method, ease of installation and cheapest appreciated. (Cheapest is my language)