Formula Roof Pitch Multiplier

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 pitch area multipliers. Simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself.

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Multiply step 1 and step 2 i e.

Formula roof pitch multiplier.

If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. 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. 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.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. So in this case for every 12 inches the roof goes across horizontally b while rising 6 inches a there s actually 13 416 inches of roof c. For example a 4 12 pitch roof that is 100 square feet. Roof pitch is used to describe the slope or angle of the roof.

Image 1 12 to 12 12 roof pitch 7 12 pitch. Roof pitch degree table. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. Use our roof pitch calculator to find the pitch of your roof.

The roof pitch multiplier is a number that allows you to find the total surface area of your roof. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

The value arrived at 928 reflects the square feet of the roof. A 12 in 12 pitch is a steep 45 degree angle roof. Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof with the same slope. Find the value of 7 12 from the roof slope multiplier table which is 1 16.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. 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. Multiply 20 and 40 which equals 800. 800 multiplied by 1 16.

100 1 054 105 4ft 2. See the image below for more explanation on rise run and pitch. The pitch of the roof is the rise over a 12 inch run.