They are made from aluminum vinyl zinc copper or stee l.
Sizing downspout to gutters.
The gutter outlet capacity should suit the downspout capacity.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to the specifications in smacna s architectural sheet metal manual 7th edition 2012.
Use the downspout to redirect runoff and help prevent garden erosion and foundation damage.
Downspout sizes must not exceed the bottom width of the gutter.
Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum.
The size of the downspout should be constant through out its length.
Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.
A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.
You should have enough gutter downspouts to effectively handle the size of your entire gutter system.
Then use the chart below to see what size gutter you need.
Doubling the number of downspouts halves the required capacity for each.
However too large a gutter downspout can look unattractive.
This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation.
The larger a gutter downspout the more water it can drain quickly.
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.
5 inch 5 520 square feet.
Gutters and gutter downspout sizes gutters are typically round shape or k style but other designs are available.
Then use the information below to see what size gutter you need.
Gutter downspout sizes are 3 to 6 inches.
5 inches and 6 inches gutters are the most common sizes installed for residential use.
5 inch 5 520 square feet.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
Size downspouts to fit the gutter.
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.
Metal or vinyl downspouts this versatile downspout has a lifetime guarantee.
Offset of more than 10 ft 3 0 m can affect drainage capacity.
6 inch 7 960 square feet.
More product details close.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
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.
Compatible with 2 in.
To limit the effects of thermal expansion in gutters 50 ft.
The downspout size must suit.
