Roof Pitch Conversion Factor

The roof pitch conversion factor is a number that when multiplied by the area covered by the roof gives an estimate the total surface area of the sloped roof itself.

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. The roof slope factor chart also consists of conversion factors to determine the slope. It is sometimes called the roof pitch multiplier. In essence a roof pitch chart is provided as a rough guide usually by a roofing company.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 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.