Roof Downspout Design

These will drain to the exterior of the building with downspouts and ultimately discharge at grade to sheet flow or to be hard piped to an underground storm system or detention pond.

Roof downspout design.

Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Without a gutter system water will simply fall off the roof and likely form pools near the base of your house. 2 by 3 inches 600 square feet. Roof area to be considered the design capacity for a roof drainage system depends on the quantity of water to be handled.

The gutter moves water to a downspout which is a pipe that carries rainwater from a roof to a drain or to the ground. The maximum accumulation of rainfall occurs when it falls perpendicular to the roof plane. Water draining from a portion of a roof surface travels to the perimeter of the roof to a shallow trough called a gutter. Design area for pitched roofs.

The amerimax flex a spout downspout extension has a rigid the amerimax flex a spout downspout extension has a rigid corrugated design for versatility. Design area wizard smacna s new downspout and gutter sizing calculator enables the user to manually enter the design area of the roof or use the design area wizard for the calculation. Tape measure gutters will end where the roof no longer slopes downward. Featuring durable vinyl construction this extension can be buried bent or connected to additional sections.

The roof area to be drained is a key factor in designing gutters and downspouts. 3 by 4 inches 1 200 square feet. As with gutters a downspout s capacity must match or exceed the expected runoff. See annotated photo below.

The area of roof contributing runoff to each gutter and downspout should be determined. What is a downspout. Factors to be considered in the design of roof drainage sys tems are the area to be drained size of gutters downspouts outlets slope of roof type of building and appearance. A properly designed gutter and downspout system will take water from the roof of your house and direct it away from the house.

To the design of the roof drainage system. This wizard makes it easy to calculate the roof design area by providing various shape calculations and the calculation for vertical walls area per international plumbing code ipc. 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. See more ideas about downspout backyard outdoor gardens.

Jun 20 2019 explore carol gulick s board downspouts on pinterest.