1 5 Pitch Roof

0 pitch 1 00x the roof area.

1 5 pitch roof.

Visually this roof appears flat. 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. However roof pitch is technically measured and defined differently. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42.

The combination of two numbers are used to display or show the roof pitch. Note that roof pitch is sometimes used in parallel with roof slope. Rafter rise run 1 5 6 2 25 36 38 25 rafter 38 25 6 18 m. We have a prairie style house in east tennessee mixed humid climate zone 4a built in the 1950s with a low slope roof pitch of 1 5 per 12.

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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Since this is a flat roof or nearly flat roof. I e 4 inches of rise per 12 inches one foot of run.

This pitch might be as low as 1 12. You can go by the measurements taken by walking the roof. Pitch rise run 1 5 6 25. It was fashionable for modern style homes built in the 1960s to have little pitch just a barely negligible slope to help drain water.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Think of a classic addams family haunted house with its soaring peaks and you have a. 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. Let s say it is equal to 1 5 m.

Roofs on victorian era houses were often sharply angled with a steep pitch. It is a planks on rafters roof that was originally tar and gravel. Sometimes pitch is also expressed in. If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.

However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. The pitch of a roof is its vertical rise over its horizontal span. Calculate the rafter length substituting these values into the following formula.

Measure the rise of your roof. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.