Roof Pitch Conversion Factor

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.

Roof pitch conversion factor.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 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 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. 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.

Roof pitch and corresponding angles. Roof pitch refers to the slope which the rafter creates. The roof slope factor chart also consists of conversion factors to determine the slope. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.