For Roof Slopes From 2 12 To 4 12

This will give you the rise over run or pitch.

For roof slopes from 2 12 to 4 12.

On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. 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.

Most roof s have a pitch in the 4 12 to 9 12 range. 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 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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

If this isn t practical then perform the same measurement on the underside of. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. Roof pitch is a term describing how steep or flat your roof slope is. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance.

For example if you measure 4 inches the pitch of your roof is 4 12. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. The combination of two numbers are used to display or show the roof pitch.

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. Five best practices reasons for using roofing felt underlayment. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12. 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. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 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. Simply put it s a shallow roof.