For Roof Slopes From 2 12 To 4 12

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.

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. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. 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. The combination of two numbers are used to display or show the roof pitch.

Simply put it s a shallow roof. Most roof s have a pitch in the 4 12 to 9 12 range. 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. Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. 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. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on.

The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. 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. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope.

For example if you measure 4 inches the pitch of your roof is 4 12. If this isn t practical then perform the same measurement on the underside of. 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 will give you the rise over run or pitch.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Roof pitch is a term describing how steep or flat your roof slope is. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt.