Roof Sqaure Footage Per Area Drain And Dwonspout

To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3.

Roof sqaure footage per area drain and dwonspout.

Max area of roof draining to one down. For a 5 inch k style gutter the square footage should be up to 5 500 sq ft and for a 6 inch k style gutter the square footage should be upto 7 900 sq ft. Adapted from smith 2014 cited below. Calculate the total roof area by multiplying its length by width.

Determine leader or pipe size. Two hundred feet of gutter can cost anywhere between 660 and 4 500. 6 inch 3 840 square feet. Calculate total roof area.

5 inch 2 500 square feet. Gutters come in a wide range of materials the cost depends on which you choose. 6 inch 7 960 square feet. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.

For most homes this means installing spouts at either end of a gutter section. We have rounded smith s data and comment further below. 5 inch 5 520 square feet. According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8.

To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity. Maximum horizontal projected roof area that can be drained in square feet. Roof drainage capacity for other roof drain pipe or leader diameters. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

There are 5 easy steps to figure out how many drains your commercial roofing project will need. Doubling the number of downspouts halves the required capacity for each. If a roof s various drainage areas call for different size gutters go for the biggest one k style. A house in chicago has a roof whose actual drainage area is 1 000 square feet.

After you have calculated the square footage use following calculations. Plumbing codes typically use the vertically projected roof area for drainage design and they often use a square foot allowance per square inch of downspout for 1 in hr 25 mm hr rainfall that varies with diameter for example 3 in 76 mm. Vinyl gutters cost 2 to 5 per linear foot.