Roof Slope 1 4 Over 12 Note

This will give you the rise over run or pitch.

Roof slope 1 4 over 12 note.

For example if you measure 4 inches the pitch of your roof is 4 12. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

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. Image 1 12 to 12 12 roof pitch 7 12 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.

Most roof s have a pitch in the 4 12 to 9 12 range. 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. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. 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.