Roof Pitch Conversion Factor

The roof slope factor chart also consists of conversion factors to determine the slope.

Roof pitch conversion factor.

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. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. 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.

A roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roof pitch and corresponding angles. Roof pitch refers to the slope which the rafter creates.