This form of drainage is preferred to prevent water from pooling on the roof and keeps rainwater from being routed through the building.
Roof downspout design.
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.
A properly designed gutter and downspout system will take water from the roof of your house and direct it away from the house.
The maximum accumulation of rainfall occurs when it falls perpendicular to the roof plane.
The roof area to be drained is a key factor in designing gutters and downspouts.
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.
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.
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.
Featuring durable vinyl construction this extension can be buried bent or connected to additional sections.
What is a downspout.
Jun 20 2019 explore carol gulick s board downspouts on pinterest.
Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area.
Roof area to be considered the design capacity for a roof drainage system depends on the quantity of water to be handled.
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.
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.
As with gutters a downspout s capacity must match or exceed the expected runoff.
The amerimax flex a spout downspout extension has a rigid the amerimax flex a spout downspout extension has a rigid corrugated design for versatility.
Tape measure gutters will end where the roof no longer slopes downward.
Design area for pitched roofs.
See annotated photo below.
Without a gutter system water will simply fall off the roof and likely form pools near the base of your house.
3 by 4 inches 1 200 square feet.
To the design of the roof drainage system.
Water draining from a portion of a roof surface travels to the perimeter of the roof to a shallow trough called a gutter.
Use the chart below to figure out how many extra downspouts you need.
