Gutter And Downspout Dimensions

As with gutters a downspout s capacity must match or exceed the expected runoff.

Gutter and downspout dimensions.

Use the chart below to figure out how many extra downspouts you need. Gutter downspout sizes are 3 to 6 inches. Size of the gutter drainage area. Round downspouts come in various sizes and colors and mostly used with half round gutters.

Offset of more than 10 ft 3 0 m can affect drainage capacity. How to figure the right downspout size. The downspout size must suit. The sizes available in this style are 3 4 5 and 6.

The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200 square feet.

For design purposes and aesthetics let s assume you have selected an 8 gutter. You should be able to. However too large a gutter downspout can look unattractive. Most downspouts are rectangular but they can also be round or square.

The gutter outlet capacity should suit the downspout capacity. One downspout is typically enough for every 20 25 feet of guttering. The larger a gutter downspout the more water it can drain quickly. Rainfall intensity is measured in inches per hour at a 5 minute interval.

You should have enough gutter downspouts to effectively handle the size of your entire gutter system. But more could be. This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system. The size of the downspout should be constant through out its length.

The flexible design easily bends and holds its shape and can be extended from 25 in. Round 3 inches 706 square feet 4 inches 1 255 square feet. Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area.