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I'm looking at the 70mm circular vents, one place states it as "10,000mm2 per metre ventilation area at 200mm centres". Not sure of the roof angle I'm afraid, but it doesn't look very steep to my uneducated eye.

Hi all, I've got an 1850's-ish semi which currently has no ventilation into the loft space, this was raised as a concern on the survey when we got the place. Not noticed any moisture buildup in the loft space (not that I tend to spend much time looking up there..) but as I'm about to remove and...