1 4 Roof Slope

While roof slope is typically expressed in rise it can also be expressed in degrees or in percent of slope.

1 4 roof slope.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. They have a pitch ranging from 4 12 to 9 12. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep.

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 measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. This means that the rise of the slope goes up or down 8 inches for every 12 inches.

Liquid applied roofing must have a design roof slope of 1 4 12 or greater 2 slope. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. To put it in perspective the angle of this slope would be around 30 degrees. The basic ranges of pitch are not uniformly defined but range from flat which are not perfectly flat but sloped to drain water up to 1 2 12 to 2 12 1 in 24 to 1 in 6.

That s the same as a 14 degree slope or a 25 slope. You can also calculate roof pitch even without using a roof slope calculator. Most roof s have a pitch in the 4 12 to 9 12 range. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25.

Why is the roof slope 25. An example for a steep sloped roof is 8 12. 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. 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.

Slope ratio a roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Conventional from 4 12 1 in 3 to 9 12 3 in 4. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. A 3 in 12 roof rises 3 for every 12 of run.

Conventional roofs are the easiest to construct and you can walk on them safely. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.