Cavity wall mess

Uncle Peter · 2014-05-21T13:01:30+00:00

When they do cavity wall insulation, do they always drill about 30 holes in the side of the house? I've never had it done myself as this house already had it, but my neighbour (2 storey semi-detached house) had it done recently and I thought they just drilled one big hole where they pumped it in. The council are doing all the flats (2 stories only) near here and they drilled about 30 1 to 2 inch holes all over the wall aswell. Even if they fill them in, they're obviously going to be noticeable. Another question - with a semi-detached, do you share a cavity? If so how does only one owner get cavity wall insulation?