Hi all,
The loft in my 30s semi has a cross-braced chipboard floor. I wanted to take to the next level by insulating the 'ceiling' so I can have clean storage and hobby/office space. I bought some 100mm sheets of PIR which I was going to friction fit between the rafters (which leaves about 50mm to the tile, so a nice air gap). Then do 50mm PIR at right angles over the rafters. I am a bit daunted now I have some boards and have seen the scale of the task!
I asked a local loft firm to give me a quote, and whilst they said a lot of good things (and the price is ok-ish), they said they don't use PIR at all. They use 'airtec double', which looks like a cross between bubblewrap and foil. Apparently they put this on the rafters, and it is equivalent to 50mm PIR, then they plasterboard. It sounds like witchcraft to me!
Is this stuff really equivalent to 50mm PIR?!
Is it a good idea to use only 50mm, then plasterboard, on a roof? Will it be too hot/cold?
I really don't want something poor, as fixing it would be extremely expensive and destructive!
I would be happy to hear anyone's thoughts. Is it an insane idea?
Cheers,
Richard.
The loft in my 30s semi has a cross-braced chipboard floor. I wanted to take to the next level by insulating the 'ceiling' so I can have clean storage and hobby/office space. I bought some 100mm sheets of PIR which I was going to friction fit between the rafters (which leaves about 50mm to the tile, so a nice air gap). Then do 50mm PIR at right angles over the rafters. I am a bit daunted now I have some boards and have seen the scale of the task!
I asked a local loft firm to give me a quote, and whilst they said a lot of good things (and the price is ok-ish), they said they don't use PIR at all. They use 'airtec double', which looks like a cross between bubblewrap and foil. Apparently they put this on the rafters, and it is equivalent to 50mm PIR, then they plasterboard. It sounds like witchcraft to me!
Is this stuff really equivalent to 50mm PIR?!
Is it a good idea to use only 50mm, then plasterboard, on a roof? Will it be too hot/cold?
I really don't want something poor, as fixing it would be extremely expensive and destructive!
I would be happy to hear anyone's thoughts. Is it an insane idea?
Cheers,
Richard.