1 4 Roof Slope

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.

1 4 roof slope.

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. Conventional from 4 12 1 in 3 to 9 12 3 in 4. This means that the rise of the slope goes up or down 8 inches for every 12 inches. 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.

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. These roofs have a pitch less than 4 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

This means for every 12 horizontal units the roof must rise a minimum of one fourth vertical unit. Liquid applied roofing must have a design roof slope of 1 4 12 or greater 2 slope. High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. You can also calculate roof pitch even without using a roof slope calculator.

To put it in perspective the angle of this slope would be around 30 degrees. 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. 3 of rise per 12 of run is the same as 1 of rise per 4 of run or 1 4 25. Examples of extreme slopes range from 1 4 12 almost flat to 12 12 sloping down at a perfect 45 degree angle.

That s the same as a 14 degree slope or a 25 slope. Most roof s have a pitch in the 4 12 to 9 12 range. An example for a steep sloped roof is 8 12. A 3 in 12 roof rises 3 for every 12 of run.

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. Why is the roof slope 25. 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.

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