I have been left high and dry by some builders and I am now trying to finish an extension. I have checked cavity wall projects for the answer but it is not clear.
As far as I can see the walls are of breeze block on the outside, a cavity and then timber frame. Then there is wool type insulation, a sheet of polythene and then plasterboard. Is this correct?
Should internal walls be the same or only walls to the outside of extension.
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