Gutter And Downspout Dimensions

The flexible design easily bends and holds its shape and can be extended from 25 in.

Gutter and downspout dimensions. One downspout is typically enough for every 20 25 feet of guttering. Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter. The sizes available in this style are 3 4 5 and 6. Most downspouts are rectangular but they can also be round or square.

Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Continuing with our example in the last step we know our gutter downspout system may be subject to as much as 1 880 gallons per minute. Round downspouts come in various sizes and colors and mostly used with half round gutters. However too large a gutter downspout can look unattractive.

How to figure the right downspout size. Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200 square feet. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. The downspout size must suit.

Round 3 inches 706 square feet 4 inches 1 255 square feet. Offset of more than 10 ft 3 0 m can affect drainage capacity. The larger a gutter downspout the more water it can drain quickly. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. For design purposes and aesthetics let s assume you have selected an 8 gutter. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. But more could be.

As with gutters a downspout s capacity must match or exceed the expected runoff. The size of the downspout should be constant through out its length. Size of the gutter drainage area. The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well.

5 inch standard k style gutter shop 5 gutterbrush. Gutter downspout sizes are 3 to 6 inches. This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system. Use the chart below to figure out how many extra downspouts you need.

You should be able to. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage.