Below the bay window of the main bedroom I've discovered a cavity (see photo) whereas the rest of the house is brick. This drops down to the top of the ground floor bay bay window.
It gets very cold in the bedroom and now I know why ! I was thinking of using Celotex 75mm PIR and replace the plaster with dry lined plasterboard?
Do I need to add a plastic sheet vapour barrier as well ? If I cut the PIR as tight as possible for the gap do I need to attach / bond it to the timber frame ?
Thanks
It gets very cold in the bedroom and now I know why ! I was thinking of using Celotex 75mm PIR and replace the plaster with dry lined plasterboard?
Do I need to add a plastic sheet vapour barrier as well ? If I cut the PIR as tight as possible for the gap do I need to attach / bond it to the timber frame ?
Thanks