Gutter And Downspout Design

Measure the distance between each downspout and draw a thick line through the exact middle point between them.

Gutter and downspout design.

Design of roof drainage systems roof drainage. The downspout size must suit the bottom width of the gutter. Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive. Maintenance durability and longevity are important factors to consider when designing gutters and downspouts.

As with gutters a downspout s capacity must match or exceed the expected runoff. Use the chart below to figure out how many extra downspouts you need. 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. The design of gutter and downspout assemblies is an area of building design which demands special attention.

Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Please lower the maximum spacing between downspouts to see this effect. 3 by 4 inches 1 200 square feet. Wide or a 117 mm 4 1 2 semicircle.

The gutter outlet capacity should suit the downspout capacity. In addition to gutter and downspout design the functionality and long term performance of your roof drainage system is critical. Featuring durable plastic construction this extension can be buried bent or connected to additional sections. Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts.

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. 2 by 3 inches 600 square feet. Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum.

Offset of more than 10 ft 3 0 m can affect drainage capacity. Then run two downspouts to the storage tank as shown on the house drawing. 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 following are detailed gutter design drawings based on the data that you entered above.

Connect areas c and b with one gutter. Connect areas d and a with one gutter. Make the gutter out of galvanized metal.