Roof Slope 1 4 Over 12 Note

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

Roof slope 1 4 over 12 note.

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. Roof pitch degree table. 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. For example if you measure 4 inches the pitch of your roof is 4 12.

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 pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

This will give you the rise over run or pitch. 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. Image 1 12 to 12 12 roof pitch 7 12 pitch. 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 table below shows common roof pitches and the equivalent grade degrees and radians for each.