Roof Slope 1 4 Over 12 Note

Roof pitch degree table.

Roof slope 1 4 over 12 note.

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 combination of two numbers are used to display or show the roof pitch. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 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.

Image 1 12 to 12 12 roof pitch 7 12 pitch. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

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 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. This will give you the rise over run or pitch. For example if you measure 4 inches the pitch of your roof is 4 12.

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.