Gutter And Downspout Design

Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive.

Gutter and downspout design.

As with gutters a downspout s capacity must match or exceed the expected runoff. Featuring durable plastic construction this extension can be buried bent or connected to additional sections. If not designed with sufficient capacity quality of materials and finish and correct installation the building structure is vulnerable to roof leaks structural degradation to both roof and wall structures foundation leaks and or decay and ground erosion. The gutter outlet capacity should suit the downspout capacity.

Offset of more than 10 ft 3 0 m can affect drainage capacity. 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. Please lower the maximum spacing between downspouts to see this effect. In addition to gutter and downspout design the functionality and long term performance of your roof drainage system is critical.

Use the chart below to figure out how many extra downspouts you need. 3 by 4 inches 1 200 square feet. The downspout size must suit the bottom width of the gutter. Design of roof drainage systems roof drainage.

Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Then run two downspouts to the storage tank as shown on the house drawing. Maintenance durability and longevity are important factors to consider when designing gutters and downspouts. Connect areas d and a with one gutter.

Wide or a 117 mm 4 1 2 semicircle. Make the gutter out of galvanized metal. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts.

Measure the distance between each downspout and draw a thick line through the exact middle point between them. Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. 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. 2 by 3 inches 600 square feet.

The proper slope is 1 inch down for every 20 feet of gutter. 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. The amerimax home products flex a spout downspout extension has the amerimax home products flex a spout downspout extension has a green color and rigid corrugated design for versatility.