Roof rafters

Old 06-20-01, 05:42 AM
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If I know the roof pitch(6/12 roof) and the roof length, what is the formular to calculator the rafter length?
Old 06-20-01, 02:42 PM
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go to the basics. a right angled triangle.
the length of the hypotenuse (rafter) squared = length of the base (half the ceiling span) squared + length of the height squared.

Old 06-21-01, 04:15 AM
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or buy a swanson speed square,comes with a very helpful book giving lenghts angles etc.much easier i think

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