Gutter And Downspout Sizing

Area for drainage design and they often use a square foot.

Gutter and downspout sizing.

Mm hr rainfall that varies with diameter for example 3. 3 by 4 inches 1 200 square feet. Plumbing codes typically use the vertically projected roof. As with gutters a downspout s capacity must match or exceed the expected runoff.

There is a range of downspout styles which are available in the market as listed below. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. Downspouts and gutters are sized in relation to rainfall on this basis. Please lower the maximum spacing between downspouts to see this effect.

Types of gutter downspouts. Round downspouts come in various sizes and colors and mostly used with half round gutters. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Use the chart below to figure out how many extra downspouts you need.

Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200 square feet. Contact an saf commercial gutter pro now. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. It is easy to see that you can vary gutter size downspout size and downspout spacing to properly size a gutter downspout system.

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. As with gutters a downspout s capacity must match or exceed the expected runoff. By reducing the downspout spacing to perhaps 35lf you could use a 6 gutter with 9 4 x6 downspouts in lieu of an 8 system. Gutter professionals have experience matching the gutters and the downspouts.

Use the chart below to figure out how many extra downspouts you need. Are sized in relation to rainfall on this basis. The sizes available in this style are 3 4 5 and 6. For example a 6 inch k style gutter requires a 3 x 4 downspout while a 5 inch k style gutter uses a 2 x 3 downspout.

With 1 gpm 0 063 l s flow rate.