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Hipped roofs in timber Various contributions have been received on this topic. Mr L. Wadsworth writes from St John S, Worcester: Having read the anonymous contribution on this subject (16 February 1999), I would like to comment further. I have, in the past, attempted to determine how a hipped roof works, but I used simple statics not 3-dimensional computer analysis. Your contributor says that 'all rafter feet have only z-direction restraint at the wallplate and are hence free to spread'. Presumably, he means that the rafters in the hipped end are supported only in the z-direction since, obviously, all the rafters away from the hipped end will be tied by the ceiling joists.