1 4 Per Foot Roof Slope

Most roof s have a pitch in the 4 12 to 9 12 range.

1 4 per foot roof slope.

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. The most common slopes are. In commercial low slope roofing applications the roof has a slope of less than 3 inches per foot.

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. We can divide roofs into the following categories. 8 27 2014 9 49 23 am.

3 12 1 2 12 and 1 4 12. 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. 4 3 1 slope.

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. 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. Generally these roofs have a pitch from 1 2 12 to 2 12 from 4 2 to 16 7.

This means that for every horizontal foot the roof level goes up less than 3 inches vertically. Remember slope is expressed as a ratio and in inches per foot. To put it in perspective the angle of this slope would be around 30 degrees. Low slope or steep slope commercial application.

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. The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches. Steep slope means that the roof has a slope of more than 3 inches per foot.

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. 18 4o inches per foot. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. 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 measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Flat roofs are not perfectly flat in reality they need a small slope for water runoff.