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Purlins . . . again The letters from Messrs Ascough and Millington (April 1982) have brought the following response from Professor A. Bolton: Mr Massey’s December 1981 letter, as you remark, concerned rafters supported on purlins. Mr Peter Ascough says that the solution is very simple-it all depends on the way the seatings are formed-and illustrates his answer by drawings showing rafters supported on wheels. Mr G. S. Millington discusses the reactions supporting the rafter as being all-important. As he says, sometimes the ridge is so flimsy that there is no chance of the reaction there being anything but horizontal, one-half of the roof merely leans on the other. If, however, the ridge is a substantial member, itself supported on cross-walls or other supports, it might provide a vertical reaction at the top of the rafter. Mr Ascough points out that timber shrinks and that the rafter may hang from a purlin or ridge beam or strut up from the wall-plate as the rest of the supports shrink away. Verulam