Gutter And Downspout Design

Connect areas c and b with one gutter.

Gutter and downspout design.

The flows and capacities of the roof gutter and downspouts shown in this design guide are based on actual measurements taken from some of the materials available. Featuring durable plastic construction this extension can be buried bent or connected to additional sections. Maintenance durability and longevity are important factors to consider when designing gutters and downspouts. This will mark a high point for your gutter and the gutter leading from this point will gently slope downward leading in a different direction on different sides of this point.

Connect areas d and a with one gutter. Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. For practical purposes the roof gutter depths and areas used are assumed to hold true for all available gutter of a given style top width and material even though differences do occur.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. The downspout size must suit the bottom width of the gutter. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. Wide or a 117 mm 4 1 2 semicircle.

Offset of more than 10 ft 3 0 m can affect drainage capacity. Please lower the maximum spacing between downspouts to see this effect. 3 by 4 inches 1 200 square feet. Use the chart below to figure out how many extra downspouts you need.

Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. Then run two downspouts to the storage tank as shown on the house drawing. 2 by 3 inches 600 square feet. The following are detailed gutter design drawings based on the data that you entered above.

Make the gutter out of galvanized metal. As with gutters a downspout s capacity must match or exceed the expected runoff. The gutter outlet capacity should suit the downspout capacity. Measure the distance between each downspout and draw a thick line through the exact middle point between them.

In addition to gutter and downspout design the functionality and long term performance of your roof drainage system is critical. The proper slope is 1 inch down for every 20 feet of gutter. The design of gutter and downspout assemblies is an area of building design which demands special attention.