Roof Slope 1 4 Over 12

These roofs have a pitch less than 4 12.

Roof slope 1 4 over 12.

For example if you measure 4 inches the pitch of your roof is 4 12. If a roof rises 1 in a length of 12 this is 1 12 roof pitch. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. They have a pitch ranging from 4 12 to 9 12.

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. 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. High and low pitch examples. Most roof s have a pitch in the 4 12 to 9 12 range.

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. Conventional roofs are the easiest to construct and you can walk on them safely. 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 will give you the rise over run or pitch. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Roof pitch degree table.

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. 1 12 roof pitch angle 4 76 degrees. Generally such roofs have a pitch ranging from 1 2 12 to 2 12. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

For every 12 horizontal feet the roof changes 8 feet in vertical height. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.