2 In 12 Roof Slope

Asphalt shingles can only be installed on roof slopes of 2 12 or greater.

2 in 12 roof slope.

For a 3 8 inch in 12 inch slope. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. For a 6 1 2 inch in 12 inch slope 6 1 2 6 5 arctan 6 5 divided by 12 arctan 0 54167 28 44 slope. I am going to be roofing a building that has some areas that are 2 in 12 pitch.

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 means for every 12 horizontal units the roof must rise a minimum of 2 vertical units. Simply put it s a shallow roof. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.

The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Divide the rise by the run and multiply by 100. A 2 12 roof slope means your roof has 2 inches of vertical drop for every 12 inches of horizontal distance. Also if asphalt shingles are installed on a roof slope of 2 12 to 4 12.

I am going to be using comp shingles and double felt. Please share any tricks or tips for making this roof water tight. 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. The table below shows common roof pitches and the equivalent grade degrees and radians for each.