12 12 Roof Pitch Multiplier

What is the multiplier.

12 12 roof pitch multiplier.

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. Multiply 20 and 40 which equals 800. 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.

For example a roof with a pitch of 1 cannot use metal shingles. Get your roof size by using this roof pitch calculator. This will give you the rise over run or pitch. For example if you measure 4 inches the pitch of your roof is 4 12.

The value arrived at 928 reflects the square feet of the roof. To convert between american roofing ratios and pitch degrees follow these steps. C sqrt 5 2 12 2 sqrt 169 13 in. Image 1 12 to 12 12 roof pitch 7 12 pitch.

Multiply step 1 and step 2 i e. Find the inverse tangent of the pitch to find the angle in degrees. 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. Find the value of 7 12 from the roof slope multiplier table which is 1 16.

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. Then the roof multiplier is. 48 10 4 8. Roof pitch multiplier 13 over 12 1 08.

The pitch of this roof is 4 8 12. We included a roof pitch chart below the 7 12 example image and the calculator below that. So 2400 x 1 12 2 688 2 88 sqs added for pitch. A 12 12 pitch roof has a pitch angle of 45.

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. 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. 800 multiplied by 1 16. Helps determine what materials are suitable for your roof.

The calculator above can handle much of this math. Divide the first part of the ratio by 12 to work out the pitch. Roof is 6 12 pitch and measures at 2 400 square feet. Using the pythagorean theorem we find that for every 12 inches the roof spans horizontally there are 13 inches of actual roof.

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