12 12 Roof Pitch Multiplier

Find the inverse tangent of the pitch to find the angle in degrees.

12 12 roof pitch multiplier.

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. Roof pitch multiplier 13 over 12 1 08. The pitch of this roof is 4 8 12. 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. A 12 12 pitch roof has a pitch angle of 45. So 2400 x 1 12 2 688 2 88 sqs added for pitch. What is the multiplier.

Roofers typically refer to it as a pitch and can be found by factoring the rise over a 12 inch run. 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. Divide the first part of the ratio by 12 to work out the pitch. Why figure what your roof pitch is.

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. 800 multiplied by 1 16. Roof is 6 12 pitch and measures at 2 400 square feet. To convert between american roofing ratios and pitch degrees follow these steps.

The calculator above can handle much of this math. If this isn t practical then perform the same measurement on the underside of the roof. Multiply 20 and 40 which equals 800. 48 10 4 8.

The value arrived at 928 reflects the square feet of the roof. Now divide the rise by the multiplier to get the pitch eg. C sqrt 5 2 12 2 sqrt 169 13 in. Helps determine what materials are suitable for your roof.

For example a roof with a pitch of 1 cannot use metal shingles. Roof pitch degree table. A flat roof has a pitch of 1 meaning the material needed is 1. Image 1 12 to 12 12 roof pitch 7 12 pitch.

Using the pythagorean theorem we find that for every 12 inches the roof spans horizontally there are 13 inches of actual roof. Find the value of 7 12 from the roof slope multiplier table which is 1 16. This will give you the rise over run or pitch. 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.

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. Then the roof multiplier is. Multiply step 1 and step 2 i e.