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.

Roof gutter sizes.

Half round 5 inch 2 500 square feet 6 inch 3 840 square feet. I denotes rainfall intensity the roof area in square feet sq m. 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.

6 inch 7 960 square feet. To limit the effects of thermal expansion in gutters 50 ft. They can be 4 5 or 6 inches. 5 inch 5 520 square feet.

Five inch k style gutters six inch half round. 15 m is a practical maximum gutter length to be served by a downspout. Downspout sizes must not exceed the bottom width of the gutter. Gutters come in different sizes.

The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. W is the width in in. However too large a gutter downspout can look unattractive. This is most common in the k style gutters.

There are two main common sizes of gutters and one of them is 5 inch. 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. Then use the chart below to see what size gutter you need. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size. There are two most common type of residential gutters that we will talk about in this post for reliable roof gutter sizing. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. The larger a gutter downspout the more water it can drain quickly.

If a roof s various drainage areas call for different size gutters go for the biggest one k style.