Roof Slope 1 4 Over 12 Note

The combination of two numbers are used to display or show the roof pitch.

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. 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. Roof pitch degree table.

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

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. 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. 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.