For Roof Slopes From 2 12 To 4 12

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

For roof slopes from 2 12 to 4 12. For example if you measure 4 inches the pitch of your roof is 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. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. 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.

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. Most roof s have a pitch in the 4 12 to 9 12 range. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Five best practices reasons for using roofing felt underlayment.

Simply put it s a shallow roof. 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. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. 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. This will give you the rise over run or pitch.

Roof pitch is a term describing how steep or flat your roof slope is. 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 handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. If this isn t practical then perform the same measurement on the underside of. 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 table below shows common roof pitches and the equivalent grade degrees and radians for each.