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Thanks. So it seems like PIR might be best. In terms of the curved/canted section would it be best to use cut pieces of PIR like celotex or a board that is designed to bend like Jackoboard? Also will duplex plasterboard bend to a curve? The radius is about 50cm. Many thanks for all comments...

Thank you. It seems like some sort of flexible wool based insulation would be best. I know there are many types. Do people recommend fibre glass type or natural forms such as sheep's wool or does it not matter?

Thank you ok yes this makes sense and a better option then celotex due to less risk of cold bridging. What about vermiculite? That would be easier to install as I wouldn't have to rip out the current plaster board completely.

Thank you. I have added pictures of the bay roof before and after adding attic insulation which in itself seems to be making a difference. I'll add a picture of the bay front this morning.

I would like to insulate the wooden frame bay on the 1st floor of my house which sits above double glazed windows on the ground floor (green arrow) I have looked at options used on previous posts about this and most suggest using celotex but I have a few concerns about this: 1) Risk of an...

I recently bought a 1930 semi detached property with cavity walls which had new DG windows and patio doors installed 7 years ago (10 year warranty still valid). I am having two separate but linked issues: - Severe dampness and mould along right side of patio door (attached image ). There is...