Roof Area Slope Factor

The surface area of the roof is found by multiplying the number found in step 3 by the number found in step 1.

Roof area slope factor.

Surface area of roof area covered by roof roof pitch factor 800 1 12 896 square feet. In construction the slope factor can be used to easily calculate the area of a roof. The slope factor extrapolates the actual area of a sloped area shown in two 2 dimensions on a plan. For example a 3 pitch or 3 in 12 pitch or 3 12 pitch all imply that the roof rises 3 inches for every 12 inches of it s horizontal run.

Roof pitch or roof slope is a measure of roof steepness or incline represented in inches rise of 12 inches run. 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 slope factor works with metric and imperial measurements. This factor can be applied to an elevation view or a plan view.

In the us the slope of the roof is typically expressed as a ratio rise in run or rise run which by general agreement in the us roofing industry always uses 12 inches as the run and states how many inches the roof rises vertically for every 12 inches the roof goes across horizontally. In other words the surface area is impacted by the slope of the roof. The roof slope factor chart also consists of conversion factors to determine the slope of the roof. The headache of using pythagoras and trigonometry can be spared by making use of these charts.

It is possible to apply a slope or pitch factor to an area. 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. 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. Sloped roofs commonly have slopes like 6 in 12 6 12 or 8 12.