Roof Area Pitch Factor

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 area pitch factor.

Get your roof size by using this 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. If the area is 10 000 squares then roof pitch would be 12 500 10 000x1 25. Dividing by 12 gives the ratio of inches in rise per distance.

For example a standard roof pitch is. Both metric and imperial measurement systems are displayed in a popup menu over the results area. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The maths behind this number is that it is the square root of rise run 2 1.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. In other words the surface area is impacted by 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. 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.

Now you re ready to price out the materials. How roof pitch is calculated to accurately calculate the area of your roof you must first determine its slope or pitch. Roof pitch is given as the number of inches in height change over the distance of one foot. This is done by measuring the width of the roof on the gable side and the exterior wall sections from corner to corner.

Surface area of roof area covered by roof roof pitch factor 800 1 12 896 square feet. Download the slope chart pdf. 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. Slope of the roof.

The roof pitch can also be determined by staying on the ground. Enter your numbers into this go to roof pitch calculator. Valley hip factor.