1 4 Per Foot Roof Slope

Roofs on most commercial buildings have at least a small slope of 1 4 inch.

1 4 per foot roof slope.

Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. Flat roofs are not perfectly flat in reality they need a small slope for water runoff. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Low slope or steep slope commercial application.

To put it in perspective the angle of this slope would be around 30 degrees. However you can only use this pitch with built up roofing or specialized synthetic roofing. If the pitch is 1 3 the slope is 8 12. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

Remember slope is expressed as a ratio and in inches per foot. The most common slopes are. 3 12 1 2 12 and 1 4 12. Steep slope means that the roof has a slope of more than 3 inches per foot.

For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. 8 27 2014 9 49 23 am. This means that the rise of the slope goes up or down 8 inches for every 12 inches. 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.

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. The table below shows common roof pitches and the equivalent grade degrees and radians for each. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 4 3 1 slope.

And pitch is a fraction derived by dividing the rise by the entire span. If the slope is 4 12 the pitch for the 24 foot span is 1 6. Most roof s have a pitch in the 4 12 to 9 12 range. 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.

A low slope roof is one whose slope is less than 3 12. Slope minimums for various roof coverings. 18 4o inches per foot. In commercial low slope roofing applications the roof has a slope of less than 3 inches per foot.

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. An example for a steep sloped roof is 8 12.