Formula Roof Pitch Multiplier

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. 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. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16.

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How To Calculate Roof Pitch

Now divide the rise by the multiplier to get the pitch eg.

Formula roof pitch multiplier.

Step 1 multiply 20 and 40 which equals 800. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. Here are the equations you may use to solve for the length of the slope and the rafter. Use the following formula which also describes a right triangle.

Rafter rise run this formula is from the pythagorean theorem. Measure the rise of your roof. Calculate the rafter length substituting these values into the following formula. Roof pitch degree table.

The pitch of this roof is 4 8 12. You can also calculate roof pitch even without using a roof slope calculator. Let s say it is equal to 1 5 m. Image 1 12 to 12 12 roof pitch 7 12 pitch.

Since pitch is the rise over a 12 inch run divide the run by 12 to get the multiplier in this case 120 12 10. The formula for the roof pitch multiplier comes from the famous pythagorean theorem. 800 multiplied by 1 16. If your roof is flat or has no more than a 3 in 12 pitch you can calculate its total square footage by simply multiplying the length by the width.

For example a 4 12 pitch roof that is 100 square feet. 48 10 4 8. Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Where a is the rise of the roof b is the run of the roof and c is the rafter hypotenuse of the triangle with side lengths a and b.

Step 3 multiply step 1 and step 2 i e. 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. The calculator above can handle much of this math. Now solving for c in the equation above gives.

If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. Use our roof pitch calculator to find the pitch of your roof. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 100 1 054 105 4ft2.

Calculate the roof pitch as the proportion of rise and run. Now you re ready to price out the materials. Pitch rise run 1 5 6 25.