12 12 Roof Pitch Multiplier

What is the multiplier.

12 12 roof pitch multiplier.

The pitch of this roof is 4 8 12. 48 10 4 8. Roof is 6 12 pitch and measures at 2 400 square feet. Multiply step 1 and step 2 i e.

We included a roof pitch chart below the 7 12 example image and the calculator below that. Divide the first part of the ratio by 12 to work out the pitch. Roofers typically refer to it as a pitch and can be found by factoring the rise over a 12 inch run. Get your roof size by using this roof pitch calculator.

For example if you measure 4 inches the pitch of your roof is 4 12. So 2400 x 1 12 2 688 2 88 sqs added for pitch. Helps determine what materials are suitable for your roof. Roof pitch degree table.

C sqrt 5 2 12 2 sqrt 169 13 in. This will give you the rise over run or pitch. If the home measures 20 x 40 and has a 7 12 roof then to calculate the slope of the roof follow these steps. The value arrived at 928 reflects the square feet of the roof.

Then the roof multiplier is. Using the pythagorean theorem we find that for every 12 inches the roof spans horizontally there are 13 inches of actual roof. Find the inverse tangent of the pitch to find the angle in degrees. Now divide the rise by the multiplier to get the pitch eg.

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 multiplier 13 over 12 1 08. 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. 800 multiplied by 1 16.

Image 1 12 to 12 12 roof pitch 7 12 pitch. A 12 12 pitch roof has a pitch angle of 45. 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 calculator above can handle much of this math.

Multiply 20 and 40 which equals 800. To convert between american roofing ratios and pitch degrees follow these steps. 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.

A flat roof has a pitch of 1 meaning the material needed is 1. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. 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.