Calculate How Many Downspouts Gutters Need

Cost of vinyl gutters and downspouts.

Calculate how many downspouts gutters need.

Size downspouts to fit the gutter. Not only can runoff from a roof ruin landscaping next to a building it may cause erosion that will damage the foundation. As with gutters a downspout s capacity must match or exceed the expected runoff. Doubling the number of downspouts halves the required capacity for each.

In terms of material options most seamless gutters roughly 80 of all installs are made from aluminum. Smaller gutters may need extra downspouts to make up for their low volume. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to the specifications in smacna s architectural sheet metal manual 7th edition 2012. Use the chart below to figure out how many extra downspouts you need.

Of gutters and downspouts you will be spending about 1 500 1 800. As with gutters a downspout s capacity must match or exceed the expected runoff. Use the chart below to figure out how many extra downspouts you need. So if you need to install 150 ln ft.

One 3x4 downspout will drain 1200 sq. Heavy rainstorms put a lot more pressure on gutters. On average two hundred feet of gutter and 50 feet of downspout will cost approximately 2250. 3 by 4 inches 1 200 square.

Aluminum is the most popular choice for gutter material because it s lightweight and durable. Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200. Large gutters can hold more water and may not need as many spouts. Gutters come in many sizes.

Keeping gutters in good condition is more important than many people realize. From time to time rain gutters wear out and must be replaced. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. 2 by 3 inches 600 square feet.

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Prices range from 6 12 per linear foot for both gutters and downspouts.

Cost of aluminum gutters and downspouts. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Typically professionally installed aluminum seamless gutters cost 10 12 per linear foot.