1 4 Roof Slope

Conventional roofs are the easiest to construct and you can walk on them safely.

1 4 roof slope.

While roof slope is typically expressed in rise it can also be expressed in degrees or in percent of slope. Low slope roofing which requires special materials and techniques to avoid leaks and ranges from 1 12 2 12 to 4 12 1 in 3. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. These roofs have a pitch less than 4 12.

This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Conventional from 4 12 1 in 3 to 9 12 3 in 4.

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. 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. 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.

That s the same as a 14 degree slope or a 25 slope. 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. You can also calculate roof pitch even without using a roof slope calculator. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep.

They have a pitch ranging from 4 12 to 9 12. This means that the rise of the slope goes up or down 8 inches for every 12 inches. A 3 in 12 roof rises 3 for every 12 of run. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25.

An example for a steep sloped roof is 8 12. Why is the roof slope 25. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. 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.

Liquid applied roofing must have a design roof slope of 1 4 12 or greater 2 slope. Most roof s have a pitch in the 4 12 to 9 12 range.