1 2 On 12 Roof Slope

Metal roof slope is expressed by a ratio indicating the roof pitch which notes the vertical rise of the roof in inches for every 12 inches the roof runs horizontally in other words dividing the vertical rise and its horizontal span.

1 2 on 12 roof slope.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Pitch of roof slope factor valley hip factor.

Download the slope chart pdf. Asphalt shingles continue to be the most widely installed roof covering option in north america. 0 pitch 1 00x the roof area. 1 pitch 1 01 2 pitch 1 02 3 pitch 1 03 4 pitch 1 05 5 pitch 1 085 6 pitch 1 12 7 pitch 1 16 8 pitch 1 21 9 pitch 1 25 10 pitch 1 31 11 pitch 1 36 12 pitch 1 42.

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 combination of two numbers are used to display or show the roof pitch. Since this is a flat roof or nearly flat roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

For example if you measure 4 inches the pitch of your roof is 4 12. 3 12 1 2 12 and 1 4 12. Roof pitch is a term describing how steep or flat your roof slope is. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof.

The most common slopes are. Simply put it s a shallow roof. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

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 short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. You can go by the measurements taken by walking the roof. A 4 12 slope is enough to accommodate water runoff but is not suitable for regions that are.