Roof Area Conversion Factors

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.

Roof area conversion factors. 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. You can consult the following chart to discover the slope factor and hip valley factor. 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.

Download the slope chart pdf. 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. Pitch of roof slope factor valley hip factor. 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.

The roof slope factor chart also consists of conversion factors to determine the slope 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.