![]() Or if you are using pitch instead of slope If you add the two calculations, square root(run² + rise²) and slope ÷ run in one formula it becomes: (building width + eaves) * (building length + gables) * slope factor = square footage of roof Used for calculating roof square footage and common rafters length. But if you want to call 6 : 12 a roof pitch, for sure you can, everyone will know what you are talking about. ![]() You can also call this a pitch, usually written as a fraction, 6/12 reduced to, a 1/2 roof pitch. 6 : 12 = the slope rises 6 inches for ever 12 inches of run. The rise in inches per foot is a slope ratio. This factor comes with different names, roof slope factor, roof slope multiplier, roof pitch multiplier, secant, or what it most likely should be called, a slope factor. The various factors and how they are calculated.Ĭalculating the square footage of a roof or the length of a rafter using a factor. ![]()
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