So another green question...
i think i want a cold deck insulation pitched roof. But not sure of the insulation thickness?
I have 6x2 (150x50mm) rafters and wanted to insulate between them.
with 100mm celotex i think i would need to counter batten under the raters to keep an air gap.
From my reading it seems you need the following specs?
1. tiles.
2. battens
3. felt
4. 50mm air gap
5. insulation (not sure how thick ?)
6. 40mm air gap
7. vapor control layer
8. plaster board
also is 100mm celotex enough it give me a u-value of 0.29 according to their calculator?
what do you'all think?
cheers
A
i think i want a cold deck insulation pitched roof. But not sure of the insulation thickness?
I have 6x2 (150x50mm) rafters and wanted to insulate between them.
with 100mm celotex i think i would need to counter batten under the raters to keep an air gap.
From my reading it seems you need the following specs?
1. tiles.
2. battens
3. felt
4. 50mm air gap
5. insulation (not sure how thick ?)
6. 40mm air gap
7. vapor control layer
8. plaster board
also is 100mm celotex enough it give me a u-value of 0.29 according to their calculator?
what do you'all think?
cheers
A