johnR wrote on Fri, 12 February 2010 13:45 |
I'd be wary of relying on expanding foam to improve isolation. It sets rigid and is probably worse than an air gap.
Normally in the UK a cavity wall is one with two layers of brick or cement blocks separated by an air gap. This would be where foam is pumped in. I suspect that if you tried to pump it in behind a plaster board wall the pressure would blow the board off.
Some cavity wall insulation is in the form of fibres or granules that are blown in. It might be worth investigating one of these.
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I am not actually entirely certain of the building structure.
It is fairly modern (70s) so I would think it should be brick cavity brick walls.
Will be down tomorrow to investigate.
I am going to have to contact someone about the details of the insulation too.