Roof Sqaure Footage Per Area Drain And Dwonspout

After you have calculated the square footage use following calculations.

Roof sqaure footage per area drain and dwonspout.

How many downspout installations should your gutters have. Gutters come in a wide range of materials the cost depends on which you choose. A house in chicago has a roof whose actual drainage area is 1 000 square 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.

We have rounded smith s data and comment further below. Adapted from smith 2014 cited below. 5 inch 5 520 square feet. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Roof drainage capacity for other roof drain pipe or leader diameters. 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. Calculate total roof area.

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. There are 5 easy steps to figure out how many drains your commercial roofing project will need. 6 inch 7 960 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. Determine leader or pipe size. Vinyl gutters cost 2 to 5 per linear foot. 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.

Maximum horizontal projected roof area that can be drained in square feet. 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. Calculate the total roof area by multiplying its length by width.

To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity. If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet. Doubling the number of downspouts halves the required capacity for each.