18 12 Roof Pitch Factor

Image 1 12 to 12 12 roof pitch 7 12 pitch.

18 12 roof pitch factor.

The roof pitch factor is also used to calculate the length of common rafters. 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. On a related note the pitch properly the slope of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections. In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by the rafter.

In order to calculate roof pitch find every inch the roof will rise for every 12 it runs or spans. In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table. Slope factor chart pitch of roof slope factor 3 12 1 0308 1 4362 4 12 1 0541 1 4530 5 12 1 0833 1 4743 6 12 1 1180 1 5000 7 12 1 1577 1 5298 8 12. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length.

We included a roof pitch chart below the 7 12 example image and the calculator below that. A roof with a 6 rise for every 12 run has a 6. While the slope of the common rafters are expressed as x in 12 the slope of the hip and valley rafter on the same roof will be x in 16 97 so where two roof sections intersect to form a 90 angle a regular hip or valley and each roof. This will give you the rise over run or pitch.

Roof pitch factor calculator. The roof pitch factor will help in figuring out the exact roof estimate. Roof pitch is used to describe the slope or angle of the roof. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision.

It is very important to determine roof pitch factors before calculating the roof pitch estimate. For example if you measure 4 inches the pitch of your roof is 4 12. A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. The last step is to come off the ladder and simply multiply the factor determined in the step above with the number of total squares of the area.

Pitched roof provide you protection again heavy rains. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. Roof pitch degree table.