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Where wind blows... Members have responded to the letter from Rollo Reed (Verulam, Vol.74, No. 2, 16 January 1996). Bill Hyde writes from Worcester: No doubt in a hurricane there are downdraughts, but I suggest that, if all of the purlin damage in Rollo Reed's photographs had been caused by downward forces, the roof coverings would still be in place. May it be that failure occurred upwards, and that the failed purlins are now simply sagging under their own weight? Verulam