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In February, when discussing snow loads, we suggested that it was difficult to believe that a committee had intended the permitted reductions in loading, allowed where large areas were supported, to be applied to snow loading. We also speculated that in commenting thus we might well be inviting yet another correction; and so indeed, up to a point, we were. Mr J. C. Thomson's letter arrived just too late for the February column. He comments: I was intrigued to read Mr W. G. Ellis’ comments on the ‘large area’ reductions in roof super loading that he has encountered in his checking activities ( Verulam, November 1979). Verulam