Roof Sqaure Footage Per Area Drain And Dwonspout

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.

Roof sqaure footage per area drain and dwonspout.

Determine leader or pipe size. Calculate total roof area. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 5 inch 2 500 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. Two hundred feet of gutter can cost anywhere between 660 and 4 500. 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. If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet.

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. For most homes this means installing spouts at either end of a gutter section. Gutters come in a wide range of materials the cost depends on which you choose.

We have rounded smith s data and comment further below. There are 5 easy steps to figure out how many drains your commercial roofing project will need. Maximum horizontal projected roof area that can be drained in square feet. 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.

6 inch 7 960 square feet. Max area of roof draining to one down. A house in chicago has a roof whose actual drainage area is 1 000 square feet. Adapted from smith 2014 cited below.

Calculate the total roof area by multiplying its length by width. If a roof s various drainage areas call for different size gutters go for the biggest one k style. How many downspout installations should your gutters have. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

5 inch 5 520 square feet. Doubling the number of downspouts halves the required capacity for each. 6 inch 3 840 square feet.