W is the width in in.
Roof gutter sizes.
For most homes this will be a large enough gutter to handle the amount of water washing off of the roof but if you live in a particularly rainy area you will want to opt for wider downspouts to be installed with your new gutters.
There are two main common sizes of gutters and one of them is 5 inch.
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.
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.
Half round gutter sizing is based on w 0 0182 la 2 5.
However too large a gutter downspout can look unattractive.
Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.
5 inch 5 520 square feet.
6 inch 7 960 square feet.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
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 a depth to width ratio of at least 0 75.
Five inch k style gutters six inch half round.
This is most common in the k style gutters.
Gutter downspout sizes are 3 to 6 inches.
Downspout sizes must not exceed the bottom width of the gutter.
Most downspouts are rectangular but they can also be round or square.
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I denotes rainfall intensity the roof area in square feet sq m.
Gutters come in different sizes.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
They can be 4 5 or 6 inches.
To limit the effects of thermal expansion in gutters 50 ft.
Half round 5 inch 2 500 square feet 6 inch 3 840 square feet.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.