1 4 Per Foot Roof Slope

4 3 1 slope.

1 4 per foot roof slope.

Slope minimums for various roof coverings. Flat roofs are not perfectly flat in reality they need a small slope for water runoff. However you can only use this pitch with built up roofing or specialized synthetic roofing. 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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. We can divide roofs into the following categories. 18 4o inches per foot.

3 12 1 2 12 and 1 4 12. 8 27 2014 9 49 23 am. And pitch is a fraction derived by dividing the rise by the entire span. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.

Most roof s have a pitch in the 4 12 to 9 12 range. 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. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.

Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7. The table below shows common roof pitches and the equivalent grade degrees and radians for each. The most common slopes are. This means that the rise of the slope goes up or down 8 inches for every 12 inches.

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. If the pitch is 1 3 the slope is 8 12. 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. In commercial low slope roofing applications the roof has a slope of less than 3 inches per foot.

Roofs on most commercial buildings have at least a small slope of 1 4 inch. Low slope or steep slope commercial application. An example for a steep sloped roof is 8 12. If the slope is 4 12 the pitch for the 24 foot span is 1 6.

For example a pitch 1 12 means that per every twelve yards of building length the rise will be equal to one yard. 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.