Roof Pitch Slope Factor

The pitch of a roof is determined by 2 numbers.

Roof pitch slope factor.

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. The rise and the length. For example if you measure 4 inches the pitch of your roof is 4 12. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

Roof pitch refers to the slope which the rafter creates. For tile shingle slate and metal roofing roof pitch is a term used in the roofing industry to describe the angle slope of a roofing structure. The headache of using pythagoras and trigonometry can be spared by making use of these charts. 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.

The slope factor works with metric and imperial measurements. This will give you the rise over run or pitch. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 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.

This calculator calculates the factor for a slope online. Most commonly a roof pitch will be from 0 flat to 12 45. 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.