1 4 Per Foot Roof Slope

Low slope or steep slope commercial application.

1 4 per foot roof slope.

Steep slope means that the roof has a slope of more than 3 inches per foot. 4 3 1 slope. In commercial low slope roofing applications the roof has a slope of less than 3 inches per foot. 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.

However you can only use this pitch with built up roofing or specialized synthetic roofing. For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. A 12 12 roof pitch would be selected as 12 inches of rise per foot with no fraction and the value generated by the calculator would be 45º. If the slope is 4 12 the pitch for the 24 foot span is 1 6.

Flat roofs are not perfectly flat in reality they need a small slope for water runoff. 8 27 2014 9 49 23 am. We can divide roofs into the following categories. 3 12 1 2 12 and 1 4 12.

This means that the rise of the slope goes up or down 8 inches for every 12 inches. An example for a steep sloped roof is 8 12. Strangely enough if a pitch of 6 inches rise per foot is entered then the degrees generated is not 22 5º it is 26 6º. Remember slope is expressed as a ratio and in inches per foot.

Roofs on most commercial buildings have at least a small slope of 1 4 inch. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. 18 4o inches per foot.

Most roof s have a pitch in the 4 12 to 9 12 range. The most common slopes are. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. This means that for every horizontal foot the roof level goes up less than 3 inches vertically.

When looking at metal roofing panel you will need to consult with the manufacturer to ensure that the metal panel you selected will work for your application. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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 pitch is 1 3 the slope is 8 12.

A low slope roof is one whose slope is less than 3 12. Slope minimums for various roof coverings.