For Roof Slopes From 2 12 To 4 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.

For roof slopes from 2 12 to 4 12.

A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope.

The combination of two numbers are used to display or show the roof pitch. This will give you the rise over run or pitch. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

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. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. If this isn t practical then perform the same measurement on the underside of. Most roof s have a pitch in the 4 12 to 9 12 range.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. The slope of a roof often referred to as the pitch is determined by rise over run the roof s vertical rise in inches for every twelve inches of horizontal length the run.

So a roof with four inches of rise every 12 inches horizontally run would have a slope of 4 12 sometimes displayed as 4 12. Roof pitch is a term describing how steep or flat your roof slope is. That means the roof doesn t shed water as easily as steeper roofs which is why choosing the right type of roofing material is so important. Simply put it s a shallow roof.

Five best practices reasons for using roofing felt underlayment. 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. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. For example if you measure 4 inches the pitch of your roof is 4 12.