Formula Roof Pitch Multiplier

Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Roof pitch degree table. 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.

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The pitch of this roof is 4 8 12.

Formula roof pitch multiplier.

Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy. 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. Now you re ready to price out the materials. Step 3 multiply step 1 and step 2 i e.

Now solving for c in the equation above gives. Use the following formula which also describes a right triangle. 100 1 054 105 4ft2. Pitch rise run 1 5 6 25.

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. The calculator above can handle much of this math. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16.

800 multiplied by 1 16. 48 10 4 8. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Image 1 12 to 12 12 roof pitch 7 12 pitch.

Now divide the rise by the multiplier to get the pitch eg. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. Calculate the roof pitch as the proportion of rise and run. For example a 4 12 pitch roof that is 100 square feet.

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. Let s say it is equal to 1 5 m. Here are the equations you may use to solve for the length of the slope and the rafter. Calculate the rafter length substituting these values into the following formula.

Use our roof pitch calculator to find the pitch of your roof. Rafter rise run this formula is from the pythagorean theorem. Measure the rise of your roof. 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.

Step 1 multiply 20 and 40 which equals 800. You can also calculate roof pitch even without using a roof slope calculator. The formula for the roof pitch multiplier comes from the famous pythagorean theorem.