Formula Roof Pitch Multiplier

See the image below for more explanation on rise run and pitch. The value arrived at 928 reflects the square feet of the roof. 100 1 054 105 4ft 2.

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For example a 4 12 pitch roof that is 100 square feet.

Formula roof pitch multiplier.

The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. Find the value of 7 12 from the roof slope multiplier table which is 1 16. 800 multiplied by 1 16.

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. Roof pitch is used to describe the slope or angle of the roof. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Simply multiply this number by the area covered by a sloped roof to obtain the total surface area of the roof itself.

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

The pitch of the roof is the rise over a 12 inch run. Image 1 12 to 12 12 roof pitch 7 12 pitch. 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 roof pitch multiplier is a number that allows you to find the total surface area of your roof.

Multiply 20 and 40 which equals 800. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. The maths behind this number is that it is the square root of rise run 2 1. A 12 in 12 pitch is a steep 45 degree angle roof.

Use our roof pitch calculator to find the pitch of your roof. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. 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. 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 step 1 and step 2 i e. Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. Roof pitch area multipliers.