Roof Sqaure Footage Per Area Drain And Dwonspout

A house in chicago has a roof whose actual drainage area is 1 000 square feet.

Roof sqaure footage per area drain and dwonspout.

For most homes this means installing spouts at either end of a gutter section. 6 inch 3 840 square feet. Doubling the number of downspouts halves the required capacity for each. After you have calculated the square footage use following calculations.

Calculate total roof area. Adapted from smith 2014 cited below. Gutters come in a wide range of materials the cost depends on which you choose. Max area of roof draining to one down.

Maximum horizontal projected roof area that can be drained in square feet. 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. 5 inch 5 520 square feet. 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.

Metal gutters vary in price from 6 to 12 for aluminum and 9 to 20 for steel to 25 or more for high end copper. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. 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 drainage capacity for other roof drain pipe or leader diameters.

5 inch 2 500 square feet. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Determine leader or pipe size. How many downspout installations should your gutters have.

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. There are 5 easy steps to figure out how many drains your commercial roofing project will need. If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.

Vinyl gutters cost 2 to 5 per linear foot. To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity. Two hundred feet of gutter can cost anywhere between 660 and 4 500.