12 12 Roof Pitch Multiplier

What is the multiplier.

12 12 roof pitch multiplier.

Roof pitch multiplier 13 over 12 1 08. 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. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. Divide the first part of the ratio by 12 to work out the pitch.

So 2400 x 1 12 2 688 2 88 sqs added for pitch. For example a roof with a pitch of 1 cannot use metal shingles. If this isn t practical then perform the same measurement on the underside of the roof. 800 multiplied by 1 16.

Image 1 12 to 12 12 roof pitch 7 12 pitch. Multiply step 1 and step 2 i e. Helps determine what materials are suitable for your roof. Get your roof size by using this roof pitch calculator.

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. Now divide the rise by the multiplier to get the pitch eg. A 12 12 pitch roof has a pitch angle of 45. The value arrived at 928 reflects the square feet of the roof.

A flat roof has a pitch of 1 meaning the material needed is 1. Find the inverse tangent of the pitch to find the angle in degrees. To convert between american roofing ratios and pitch degrees follow these steps. This will give you the rise over run or pitch.

Multiply 20 and 40 which equals 800. The calculator above can handle much of this math. Then the roof multiplier is. Roof pitch degree table.

Roof is 6 12 pitch and measures at 2 400 square feet. For example if you measure 4 inches the pitch of your roof is 4 12. Why figure what your roof pitch is. 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.

Roofers typically refer to it as a pitch and can be found by factoring the rise over a 12 inch run. C sqrt 5 2 12 2 sqrt 169 13 in. 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. We included a roof pitch chart below the 7 12 example image and the calculator below that.

Find the value of 7 12 from the roof slope multiplier table which is 1 16. Using the pythagorean theorem we find that for every 12 inches the roof spans horizontally there are 13 inches of actual roof. 48 10 4 8.