For Roof Slopes From 2 12 To 4 12

For example if you measure 4 inches the pitch of your roof is 4 12.

For roof slopes from 2 12 to 4 12.

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. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. 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.

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. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. 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.

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. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. This will give you the rise over run or pitch. Simply put it s a shallow roof.

The combination of two numbers are used to display or show the roof pitch. Five best practices reasons for using roofing felt underlayment. Roof pitch is a term describing how steep or flat your roof slope is. 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. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. 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.