Roof Sqaure Footage Per Area Drain And Dwonspout

5 inch 5 520 square feet.

Roof sqaure footage per area drain and dwonspout.

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. For most homes this means installing spouts at either end of a gutter section. There are 5 easy steps to figure out how many drains your commercial roofing project will need. 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.

A house in chicago has a roof whose actual drainage area is 1 000 square feet. Roof drainage capacity for other roof drain pipe or leader diameters. Doubling the number of downspouts halves the required capacity for each. Maximum horizontal projected roof area that can be drained in square feet.

If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet. We have rounded smith s data and comment further below. Vinyl gutters cost 2 to 5 per linear foot. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Calculate total roof area. How many downspout installations should your gutters have. 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.

5 inch 2 500 square feet. Adapted from smith 2014 cited below. 6 inch 7 960 square feet. Determine leader or pipe size.

After you have calculated the square footage use following calculations. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 6 inch 3 840 square feet. Gutters come in a wide range of materials the cost depends on which you choose.

To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity. 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. Calculate the total roof area by multiplying its length by width.