Hi all,
Just had a new extension 3mx5m. Pitched roof with breathable membrane fitted with Marley Moderns. The rafters have enough space for 170mm I believe ( want a bit of space to run cables though)
Now looking for the insulation to fit in there.
Any recommendations on whats best or they all the same pretty much? (celotex,kingspan,xtratherm etc)
I think the building regs person said they have to be 150mm to achieve the required U value? Think I have to achieve 0.18 U value?
I was thinking 100mm first, then a 50mm over that, then board. Or maybe 2x70mm. Depending on prices etc.
If anyone knows of the cheapest place to get them I would appreciate that too. (trade or public).
Edit.....Sorry one last thing, I presume I'm looking for a board thats foil backed both sides to minimise condensation? Thanks
Just had a new extension 3mx5m. Pitched roof with breathable membrane fitted with Marley Moderns. The rafters have enough space for 170mm I believe ( want a bit of space to run cables though)
Now looking for the insulation to fit in there.
Any recommendations on whats best or they all the same pretty much? (celotex,kingspan,xtratherm etc)
I think the building regs person said they have to be 150mm to achieve the required U value? Think I have to achieve 0.18 U value?
I was thinking 100mm first, then a 50mm over that, then board. Or maybe 2x70mm. Depending on prices etc.
If anyone knows of the cheapest place to get them I would appreciate that too. (trade or public).
Edit.....Sorry one last thing, I presume I'm looking for a board thats foil backed both sides to minimise condensation? Thanks