Doubling the number of downspouts halves the required capacity for each.
Sizing downspout to gutters.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
15 m is a practical maximum gutter length to be served by a downspout.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
The second most common style of downspouts in urban homes is the rectangular downspout coming under a range of sizes such as 2 3 3 4 and 4 5.
The size of the downspout should be constant through out its length.
Downspout sizes must not exceed the bottom width of the gutter.
The larger a gutter downspout the more water it can drain quickly.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation.
To limit the effects of thermal expansion in gutters 50 ft.
Compatible with 2 in.
The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and.
5 inches and 6 inches gutters are the most common sizes installed for residential use.
They are made from aluminum vinyl zinc copper or stee l.
Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum.
Now that we are well aware of the various gutter downspout sizes and styles let us dig deeper into the materials used for effective downspouts and how much they shall cost.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
5 inch 5 520 square feet.
Most downspouts are rectangular but they can also be round or square.
Then use the information below to see what size gutter you need.
Offset of more than 10 ft 3 0 m can affect drainage capacity.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
The gutter outlet capacity should suit the downspout capacity.
Gutters and gutter downspout sizes gutters are typically round shape or k style but other designs are available.
You should have enough gutter downspouts to effectively handle the size of your entire gutter system.
Gutter downspout sizes are 3 to 6 inches.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
The downspout size must suit.
Size downspouts to fit the gutter.
Then use the chart below to see what size gutter you need.
More product details close.
However too large a gutter downspout can look unattractive.
Use the downspout to redirect runoff and help prevent garden erosion and foundation damage.
Metal or vinyl downspouts this versatile downspout has a lifetime guarantee.
5 inch 5 520 square feet.
