Common Gutter Downspout Sizes

For runs of over 40 but less than 60 the gutters should be installed.

Common gutter downspout sizes.

Rectangular gutter downspouts are available in 2 3 3 4 and 4 5 sizes. Use the chart below to figure out how many extra downspouts you need. Round downspouts are typically used with half round gutters. The size of the downspout should be constant through out its length.

Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run. How do you size a downspout. The downspouts help you size the gutters. Table 1 2 rainfall data and drainage factors a storms which should be exceeded only once in 10 years b storms which should be exceeded only once in 100 years intensity lasting 5 minutes calculated roof area drained per.

By far the 5 inch size is most popular and works for most roofs. One inch of rain falling on a 1000 square feet of roof amounts to 550 gallons of water flowing off your house. Now that we are well aware of the various gutter downspout sizes and styles let us dig deeper into the materials used for effective downspouts and how much they shall cost. They come in various colors and sizes of 3 4 5 and 6.

Downspouts of less than 7 00 sq in 4515 sq mm cross section should not be used except for small areas such as porches and canopies. Typical downspouts come in two sizes. You may also need a splash block to catch splatter coming out of the downspout. The downspout size must suit the bottom width of the gutter.

The standard is about inch per 10 feet. Your rain gutters handle a lot of water. Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter. As with gutters a downspout s capacity must match or exceed the expected runoff.

The above recommendations assume that you have properly sized downspouts every 40 feet. A long lasting guttering system and downspout will not only relieve if you any hassles and tensions in the future but also cut down on repair and. 2x3 inch downspouts fit 5 inch gutters and 3x4 inch downspouts fit 6 inch gutters. Typical residential k style gutters come in two sizes.

The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well. This is the second most common downspout style seen in homes constructed in the city. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s. What are common gutter sizes.

The second most common style of downspouts in urban homes is the rectangular downspout coming under a range of sizes such as 2 3 3 4 and 4 5. The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well.