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Insulating a cavity wall internally

I am converting an integral garage to a kitchen and need to insulate a cavity wall that contains no insulation. I was hoping to batten it at 400 centres with insulation between and then plasterboard and skim. My queries are: what thickness of celotex board would I need and would I require an air gap between them?
Any advice would be great

1 Answer from a MyBuilder Insulation Installer

It will be easier to just use 62.5mm kingspan K18 kooltherm insulated plasterboards. These come complete with a foil barrier bonded to the back. Screw 2" x 1" tanalised battons to the wall first then screw the boards on them.


Answered 17th Jan 2016

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