Roof Area Pitch Factor

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.

Roof area pitch factor.

This is done by measuring the width of the roof on the gable side and the exterior wall sections from corner to corner. Now you re ready to price out the materials. Valley hip factor. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

Enter your numbers into this go to roof pitch calculator. 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. Both metric and imperial measurement systems are displayed in a popup menu over the results area. The maths behind this number is that it is the square root of rise run 2 1.

Surface area of roof area covered by roof roof pitch factor 800 1 12 896 square feet. 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. Dividing by 12 gives the ratio of inches in rise per distance. The roof pitch can also be determined by staying on the ground.

Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch. In other words the surface area is impacted by the slope of the roof. Roof pitch is given as the number of inches in height change over the distance of one foot. 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. For example a standard roof pitch is. Slope of the roof. 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.

How roof pitch is calculated to accurately calculate the area of your roof you must first determine its slope or pitch. Download the slope chart pdf. The surface area of the roof is found by multiplying the number found in step 3 by the number found in step 1.