Gutter And Downspout Design

Wide or a 117 mm 4 1 2 semicircle.

Gutter and downspout design.

Maintenance durability and longevity are important factors to consider when designing gutters and downspouts. Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. As with gutters a downspout s capacity must match or exceed the expected runoff. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area.

Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. Please lower the maximum spacing between downspouts to see this effect. Use the chart below to figure out how many extra downspouts you need. The following are detailed gutter design drawings based on the data that you entered above.

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. 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. Connect areas c and b with one gutter.

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. In addition to gutter and downspout design the functionality and long term performance of your roof drainage system is critical. The gutter outlet capacity should suit the downspout capacity. The design of gutter and downspout assemblies is an area of building design which demands special attention.

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. Then run two downspouts to the storage tank as shown on the house drawing. The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts. The downspout size must suit the bottom width of the 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. Make the gutter out of galvanized metal. Design of roof drainage systems roof drainage. 3 by 4 inches 1 200 square feet.

The proper slope is 1 inch down for every 20 feet of gutter. 2 by 3 inches 600 square feet. Leaking gutters and downspouts can cause serious damage to a building s interior as well as exterior and repairs can be expensive.