Gutter And Downspout Design

The gutter and downspout size required is highly dependent on the amount of gutter and the spacing of the downspouts.

Gutter and downspout design.

The downspout size must suit the bottom width of the gutter. 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 design of gutter and downspout assemblies is an area of building design which demands special attention. Connect areas d and a with one gutter.

The proper slope is 1 inch down for every 20 feet of gutter. 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. As with gutters a downspout s capacity must match or exceed the expected runoff. Wide or a 117 mm 4 1 2 semicircle.

Adding additional downspouts will require less gutter and downspout volume resulting in smaller gutters downspouts. Maintenance durability and longevity are important factors to consider when designing gutters and downspouts. 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. Connect areas c and b with one gutter.

Featuring durable plastic construction this extension can be buried bent or connected to additional sections. Then run two downspouts to the storage tank as shown on the house drawing. 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. In addition to gutter and downspout design the functionality and long term performance of your roof drainage system is critical.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. Make the gutter out of galvanized metal. 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.

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. 2 by 3 inches 600 square feet. The gutter outlet capacity should suit the downspout capacity.

The following are detailed gutter design drawings based on the data that you entered above. Measure the distance between each downspout and draw a thick line through the exact middle point between them. 3 by 4 inches 1 200 square feet.