HM
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[quote author=warreng link=1095856605/0#0 date=1095856605]He's done a wall with a gap in between for damp proofing, do you require this? [/quote]
That doesn't make sense to me. A damp proofed wall (as I understand it) is one where a waterproof membrance is laid between courses of bricks - usually up to about 6 inches above ground level. So water can't "climb" the brickwork 'cos it hits a barrier which it can't cross.
A "wall with a gap between" suggests a cavity wall. That's different to damp proofing (again, as I understand it). That's more for insulation purposes, a bit like double glazing sandwiching a layer of air to keep down thermal and noise conduction. It may contribute to damp proofing, I don't know, but if I were looking at damp proofing a wall I wouldn't start by building a cavity.
Andrew
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