Roof Area Conversion Factors

You can consult the following chart to discover the slope factor and hip valley factor.

Roof area conversion factors.

When scaling a roof size from a drawing multiply roof area x slope factor total area 2 12 roof area x 1 0147 total area 3 12 roof area x 1 031 total area 4 12 roof area x 1 054 total area 5 12 roof area x 1 083 total area 6 12 roof area x 1 118 total area 7 12 roof area x 1 158 total area 8 12 roof area x 1 202 total area. A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run. The headache of using pythagoras and trigonometry can be spared by making use of these charts. Download the slope chart pdf.

Take your area result and multiply it by the pitch multiplier or slope correction factor found in the table above to arrive at the roof s surface area. Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq. Feet the area of a hip roof equals the area of a gable roof with the same dimensions. A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof.

For roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. Pitch of roof slope factor valley hip factor.