Xenomorph
Distinguished Member
You’re right and cold in winter too. I just searched for Celotex, that’s the stuff that you can cut with a knife so it fits tight between the trusses?
Correct. I can certainly vouch for its effectiveness, as I'm currently sitting in the converted roof space of a bungalow. I remember in my previous house the roof space really got hot as hell in the summer. The Celotex keeps heat in during winter, and reflects heat on the roof during summer.
You're right, it comes in big sheets, and can be cut to fit the space. People usually plasterboard over the top to create a nice finish.