1 4 Per Foot Roof Slope

8 27 2014 9 49 23 am.

1 4 per foot roof slope.

The table below shows common roof pitches and the equivalent grade degrees and radians for each. A low slope roof is one whose slope is less than 3 12. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. If the pitch is 1 3 the slope is 8 12.

Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. 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 that for every horizontal foot the roof level goes up less than 3 inches vertically. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

If the slope is 4 12 the pitch for the 24 foot span is 1 6. 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. 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.

However you can only use this pitch with built up roofing or specialized synthetic roofing. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Most roof s have a pitch in the 4 12 to 9 12 range. And pitch is a fraction derived by dividing the rise by the entire span.

In commercial low slope roofing applications the roof has a slope of less than 3 inches per foot. This means that the rise of the slope goes up or down 8 inches for every 12 inches. To put it in perspective the angle of this slope would be around 30 degrees. We can divide roofs into the following categories.

An example for a steep sloped roof is 8 12. Steep slope means that the roof has a slope of more than 3 inches per foot. Flat roofs are not perfectly flat in reality they need a small slope for water runoff. The most common slopes are.

3 12 1 2 12 and 1 4 12. For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. Slope minimums for various roof coverings. Low slope or steep slope commercial application.

4 3 1 slope. 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.