Roof Slope Conversion Chart

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.

Roof slope conversion chart.

To obtain an accurate roof pitch measurement properly measure the rise and run. First convert the pitch to a slope. Giving you a slope of 8 556 in 12 or. Approximately 8 9 16 in 12.

For many home owners the roof is a hugely important feature of the home and is the key section of the home which is seen from the exterior. You can also calculate roof pitch even without using a roof slope calculator. It s very inexpensive and very accurate. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

Given that roofs are normally spotted from a distance long before any windows and doors they will be a large determining factor as to what someone will think of when they look at your property. If you re not sure what the slope of your roof is and you want to determine that in either degrees or rise in run we recommend this slope finder on amazon. Use the following formula which also describes a right triangle. To do this simply convert the rise and run as a fraction to a decimal form eg.

0 713 x 12 8 556. Here are the equations you may use to solve for the length of the slope and the rafter. Then you ll be able to measure slope from an unfinished attic space under the roof. Rise run rise run slope.