18 12 Roof Pitch Factor

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.

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. Image 1 12 to 12 12 roof pitch 7 12 pitch. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

For example if you measure 4 inches the pitch of your roof is 4 12. In that case the multiplier is multiplied by the run of the rafter the horizontal distance that will be covered by the rafter. A roof with a 6 rise for every 12 run has a 6. We included a roof pitch chart below the 7 12 example image and the calculator below that.

The roof pitch factor will help in figuring out the exact roof estimate. Roof pitch factor calculator. 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. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

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. A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. 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. 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. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Roof pitch degree table.

In our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table. Pitched roof provide you protection again heavy rains. This will give you the rise over run or pitch.