Formula Roof Pitch Multiplier

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 pitch of this roof is 4 8 12. Use the following formula which also describes a right triangle.

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

Formula roof pitch multiplier.

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 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. 48 10 4 8.

Calculate the rafter length substituting these values into the following formula. For example a 4 12 pitch roof that is 100 square feet. 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. Steep roofs measure your house at ground level then add in the roof s overhang for greater accuracy.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Step 3 multiply step 1 and step 2 i e. Use our roof pitch calculator to find the pitch of your roof. Let s say it is equal to 1 5 m.

Next multiply the footprint of the roof by the multiplier below for your roof pitch to find the overall roof area. Step 2 find the value of 7 12 from the roof slope multiplier table which is 1 16. Step 1 multiply 20 and 40 which equals 800. So the actual roof surface if it were laid down flat on the ground would be 1 118 times larger than the footprint of the roof.

Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. 100 1 054 105 4ft2. Measure the rise of your roof. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps.

Roof pitch degree table. That gives you 5 590 square feet which is the actual area of the surface of the roof. You can also calculate roof pitch even without using a roof slope calculator. The calculator above can handle much of this math.

The formula for the roof pitch multiplier comes from the famous pythagorean theorem. Pitch rise run 1 5 6 25. Image 1 12 to 12 12 roof pitch 7 12 pitch. Calculate the roof pitch as the proportion of rise and run.

And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. Here are the equations you may use to solve for the length of the slope and the rafter. 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. Rafter rise run this formula is from the pythagorean theorem.

Now solving for c in the equation above gives.