Roof Slope 1 4 Over 12 Note

Roof pitch degree table.

Roof slope 1 4 over 12 note.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Most roof s have a pitch in the 4 12 to 9 12 range. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. The combination of two numbers are used to display or show the roof pitch. Image 1 12 to 12 12 roof pitch 7 12 pitch. For example if you measure 4 inches the pitch of your roof is 4 12.

If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. This will give you the rise over run or pitch. Slope conversion tables 1 4 1 2 3 4 1 1 1 4 1 1 2 1 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 2 25 3 4 5 6 7 8 9 10. 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.

The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.