1 In 4 Roof Slope

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

1 in 4 roof 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. Roof pitch on the form x 12 can be expressed in grades as. 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. Slope as grade for an elevation of 1 m over a distance of 2 m can be calculated as.

0 pitch 1 00x the roof area. They have a pitch ranging from 4 12 to 9 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. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Roof pitch is the slope created by the rafter. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42. These roofs have a pitch less than 4 12. S grade 1 m 2 m 50 slope and roof pitch.

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. Conventional from 4 12 1 in 3 to 9 12 3 in 4. S grade 100 x 12 3. Since this is a flat roof or nearly 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. Conventional roofs are the easiest to construct and you can walk on them safely. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit.

High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. 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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. You can also calculate roof pitch even without using a roof slope calculator.

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. Most roof s have a pitch in the 4 12 to 9 12 range. The table below shows common roof pitches and the equivalent grade degrees and radians for each.