Roof Pitch Numbers

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 numbers.

Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean. Pitch rise run 1 5 6 25. Roof pitch and corresponding angles. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.

Angle arctan pitch arctan 0 25 14. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. The rafters equal the span.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. The rafter length is 3 4 the span about 48. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.

Roof pitch calculator is determined by the number of inches it rises vertically for every 12 inches it extends horizontally. The ridge height is 1 9 to 1 7th the span an angle of 12 5 to 16. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe. Often you express roof pitch as the ratio between the rise and the run in the form of x 12.

The ridge height is 2 9ths to 1 3 the span an angle of 24 to 34. Calculate the roof pitch as the proportion of rise and run. Roof pitch refers to the slope which the rafter creates. The 7 means that the roof rises 7 for every 12 it runs.

How to measure roof pitch. For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch. Recalculate this value into an angle. Finally you can find the roof pitch in the form of x 12.

The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The most commonly used roof pitches fall in a range between 4 12 and 9 12.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.