Gutters and downspouts for distributing rainwater should be the correct size, durable, attractive and well-suited to buildings on which they are used. Because specifications depend on gutter type and special considerations, such as roof construction, you should consult with a company specializing in gutter design and installation for product advice.
General guidelines for selecting and installing gutters include:
Select gutters at least 5 inches wide.
Select gutters made from galvanized steel (29 gauge minimum) or aluminum (0.025 inch minimum).
To enhance flow, slop sectional gutters 1/16 inch per 1 foot of gutter; slope seamless gutters 1/16 inch per 10 feet.
Use expansion joints at connections for straight runs exceeding 40 feet.
Keep the front of the gutter ½ inch lower than the back.
Provide gutter hangers at least every 3 feet; every 1 foot in areas of heavy snow load.
Select elbows with 45, 60, 75 or 90 degree angles, as needed.
General guidelines for selecting and installing downspouts include:
Space downspouts from 20 to 50 feet apart.
Provide 1-square-inch of downspout area for every 100 square feet of roof area. A 2-inch-by-3-inch downspout will accommodate 600 to 700 square feet; a 3-inch-by-4-inch downspout will accommodate up to 1,200 square feet.
Do not exceed 45-degree angle bends.
Select downspout configuration (square, round or corrugated round) depending on your needs.
Use 4-inch diameter pipes to convey water to storage containers or filters.
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