Roof Pitch Conversion Factor

A 10 slope roof should not be confused with a 10 pitch roof as a 10 slope roof means that the roof rises by ten inches for every foot of run.

Roof pitch conversion factor.

Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. The headache of using pythagoras and trigonometry can be spared by making use of these charts. The combination of two numbers are used to display or show the roof pitch. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

The roof slope factor chart also consists of conversion factors to determine the slope of the roof. In essence a roof pitch chart is provided as a rough guide usually by a roofing company to help you see what the average roof pitches tend to be. Then you ll be able to measure slope from an unfinished attic space under the roof. To obtain an accurate roof pitch measurement properly measure the rise and run.

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. 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. Usually they come in the form of a roof pitch diagram chart but other times it will be presented to you in a conversion format. Roof pitch is used to describe the slope or angle of the roof.