18 12 Roof Pitch Factor

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.

18 12 roof pitch factor.

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

A roof pitch of 4 in 12 4 12 has a rise of 4 and a run of 12. If you have already decided that you are going to have pitched roof on your house then you have made a nice decision. For example if you measure 4 inches the pitch of your roof is 4 12. We included a roof pitch chart below the 7 12 example image and the calculator below that.

Roof pitch is used to describe the slope or angle of the roof. Roof pitch factor calculator. It is very important to determine roof pitch factors before calculating the roof pitch estimate. The roof pitch factor is also used to calculate the length of common rafters.

In order to calculate roof pitch find every inch the roof will rise for every 12 it runs or spans. 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. This will give you the rise over run or pitch. 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 our example the roof pitch was calculated as 9 12 which has a factor of 1 25 in the table. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. There are lots of advantages that you can get by having pitched roof on your house as compare to flat roof. Image 1 12 to 12 12 roof pitch 7 12 pitch.

A roof with a 6 rise for every 12 run has a 6. 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. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.