Roof Area Pitch Factor

In other words the surface area is impacted by the slope of the roof.

Roof area pitch factor.

The roof pitch can also be determined by staying on the ground. This is done by measuring the width of the roof on the gable side and the exterior wall sections from corner to corner. 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. Dividing by 12 gives the ratio of inches in rise per distance.

Download the slope chart pdf. If the area is 10 000 squares then roof pitch would be 12 500 10 000x1 25. 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. Valley hip factor.

Roof pitch is given as the number of inches in height change over the distance of one foot. The surface area of the roof is found by multiplying the number found in step 3 by the number found in step 1. Now you re ready to price out the materials. The maths behind this number is that it is the square root of rise run 2 1.

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. 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. 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. Surface area of roof area covered by roof roof pitch factor 800 1 12 896 square feet.

Slope of the roof. Both metric and imperial measurement systems are displayed in a popup menu over the results area. For example a standard roof pitch is. 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.

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. Get your roof size by using this roof pitch calculator.