Roof Slope Factor Degrees

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.

Roof slope factor degrees.

Look at the column labeled pitch then look under degrees to get the corresponding amount of degrees. To obtain an accurate roof pitch measurement properly measure the rise and run. Then you ll be able to measure slope from an unfinished attic space under the roof. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.

Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. As 6 is half of 12 it is considered to be 50. Therefore your slope factor for a 6 12 pitch roof is 1 118. If you know the roof pitch in degrees find the secant of the slope using a scientific calculator.

8 12 pitch 33 75 degrees. Similarly grades and angles can be calculated for the actual pitch using the roof pitch factor formula. Grades are the measure of percentage. Determine its angle through taking a 12 inch level and.

Other than the 45 roof slope which is 12 in 12 none of the standard roof pitches 5 in 12 6 in 12 etc are equal to a whole degree. Using a tape measure make a pencil mark 12 inches from the end of a carpenter s level. That s your roof pitch multiplier. Identify the rise and run.

Roof pitch to degrees equivalents this drawing demonstrates how many degrees rise for each pitch of a typical roof. The rise will be equal to the amount of the incline within the given distance or the run that. The angle for 6 12 is 26 57 and in grades it is described as 50. Roof pitch and corresponding angles.

Factor charts you could calculate the slope factor for every single roof pitch but as a public service many roofing companies provide slope factor charts. Last updated july 10 2020 the following table shows the roof pitch rise in run equivalents for all roof slopes in degrees from 1 to 72. For help converting any slope from one way of expressing it to another see roof slope expressed as rise in run degrees and percentage. Enter 6 into the calculator slope factor 1 1180 multiply the roof length by the gable wall length 40 24 960 multiply this amount by the slope factor 960 1 1180 1073 28 the area of this roof 1073 3 sq.

Divide its rise by run in. For example if the roof pitch is 45 then sec 45 1 414213.