1 4 Roof Slope

The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

1 4 roof slope.

Conventional roofs are the easiest to construct and you can walk on them safely. While roof slope is typically expressed in rise it can also be expressed in degrees or in percent of slope. This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. You can also calculate roof pitch even without using a roof slope calculator.

These roofs have a pitch less than 4 12. 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. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. 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. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle. Why is the roof slope 25. 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.

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. 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. 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. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. For most home styles roof pitches fall in a range 4 12 a moderate slope up to 8 12 fairly steep. This means that the rise of the slope goes up or down 8 inches for every 12 inches.

That s the same as a 14 degree slope or a 25 slope. A 3 in 12 roof rises 3 for every 12 of run. They have a pitch ranging from 4 12 to 9 12. To put it in perspective the angle of this slope would be around 30 degrees.

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 measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.