Im planning on installing rigid board insulation (e.g celotex/kingspan) on the inside of my house (its a 1920s bungalow with thin 15cm timber frame walls). Would you mind advising on the following?
1. I assume I can just leave the existing walls and plaster completely alone and just build an internal stud wall which I can fill with insulation. If so do I just attach the new studs to the existing studs through the plaster(using some very long screws/nails?) or do I need to remove all the old plaster to reveal the existing studs?
2. Do I need to leave an air gap on either side of the celotex/kingpspan, or should it be flush against the plasterboard?
3. Do I need to put some form of water proof barrier between the celotex/kingspan and the plasterboard, and if so which side (I think its the internal side right?)
4. If I wish to install 100mm of celotex what would be the total size of the new stud wall (i.e how much of the room would I loose?)
if its timber stud then I would remove the plasterboard,its easier.Remember you will have to alter the electrical back boxes aswell,and the window boards,skirting, architraves.The moisture barrier will be on the other side of the side of the stud so it wont affect the alteration.
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