Gutter And Downspout Sizing

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

Gutter and downspout sizing. Please lower the maximum spacing between downspouts to see this effect. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Downspouts and gutters are sized in relation to rainfall on this basis. With 1 gpm 0 063 l s flow rate.

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. The sizes available in this style are 3 4 5 and 6. 2 by 3 inches 600 square feet. Rectangular 2 by 3 inches 600 square feet 3 by 4 inches 1 200 square feet.

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. Gutter professionals have experience matching the gutters and the downspouts. Contact an saf commercial gutter pro now.

Use the chart below to figure out how many extra downspouts you need. Allowance per square inch of downspout for 1 in hr 25. Are sized in relation to rainfall on this basis. Plumbing codes typically use the vertically projected roof.

As with gutters a downspout s capacity must match or exceed the expected runoff. Types of gutter downspouts. 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. 3 by 4 inches 1 200 square feet.

Mm hr rainfall that varies with diameter for example 3. It is easy to see that you can vary gutter size downspout size and downspout spacing to properly size a gutter downspout system. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. Use the chart below to figure out how many extra downspouts you need.

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.