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Hipped rafters Two more contributors have reverted to this much-discussed topic. Stuart Marchant writes from London SW18: I have been following the recent correspondence with interest and studying my own roof I fail to understand how Alasdair Beal(1 June 1999) infers that purlins greatly reduce the triangulation forces. The purlins in the roofs that I have seen are generally perpendicular to the rafters with inclined props. These will induce an axial load in the rafter in much the same way as a ridge board, although of a slightly reduced magnitude, resulting in an outward thrust at the wallplate.