To properly size gutters for installation you need to know the local rainfall intensity.
Square architectural gutters.
From table 10 7a plain round 5 downspouts with an area of 19 63 square inches will be used.
Downspout area 1680 130 12 9 sq.
5 inch 5 520 square feet.
Stramit square gutters coated with zinc aluminium zinc aluminium magnesium alloy and colorbond steel will give excellent durability in almost all locations more than 200m from a marine environment or in some light industrial applications.
The minimum downspout size is min.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Gutter dimensions are selected from the horizontal gutter sizing table based on the slope of the gutter to the downspout s and the gutter capacity based upon the roof flow rate in gallons per minute.
Then use the information below to see what size gutter you need.
With 1 gpm 0 063 l s flow rate.
From table 10a column b2 the area drained per square inch of downspout is 130 sf.
Downspouts and gutters are sized in relation to rainfall on this basis.
Applications close to industrial or unusually corrosive environments will need to be individually assessed for durability.
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Riverside sheet metal has a wide variety of downspouts to offer as well as many custom made to fit your needs.