Roof Area Pitch Factor

The overhanging portions on the roof are duly added into the figure.

Roof area pitch 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. If the area is 10 000 squares then roof pitch would be 12 500 10 000x1 25. This is done by measuring the width of the roof on the gable side and the exterior wall sections from corner to corner. 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.

Get your roof size by using this roof pitch calculator. Valley hip factor. Now you re ready to price out the materials. Download the slope chart pdf.

In other words the surface area is impacted by the slope of the roof. Both metric and imperial measurement systems are displayed in a popup menu over the results area. How roof pitch is calculated to accurately calculate the area of your roof you must first determine its slope or pitch. The roof pitch can also be determined by staying on the ground.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Slope of the roof. The surface area of the roof is found by multiplying the number found in step 3 by the number found in step 1. Surface area of roof area covered by roof roof pitch factor 800 1 12 896 square feet.

Dividing by 12 gives the ratio of inches in rise per distance. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor. Roof pitch is given as the number of inches in height change over the distance of one foot.

For example a standard roof pitch is. The maths behind this number is that it is the square root of rise run 2 1. A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.