Rafters can be designed as for the more simple roof described earlier - the jack rafters will maintain the same cross-section, be birdsmouthed over the plate and nailed either side of the hip rafter. The angle of cut on the rafter abutting the hip rafter is what is known as a compound angle and this, like many other of the angles necessary on timbers in roof structures, can be calculated from the 'carpenter's square' or by reference to such specialist sets of tables as can be found in the Roofing Ready Reckoner (see the bibliography).

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