Roof Gutter Sizes

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

Roof gutter sizes.

Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. 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. 15 m is a practical maximum gutter length to be served by a downspout.

There are two main common sizes of gutters and one of them is 5 inch. Gutters come in different sizes. 6 inch 7 960 square feet. Downspout sizes must not exceed the bottom width of the gutter.

This is most common in the k style gutters. The larger a gutter downspout the more water it can drain quickly. I denotes rainfall intensity the roof area in square feet sq m. There are two most common type of residential gutters that we will talk about in this post for reliable roof gutter sizing.

Half round gutter sizing is based on w 0 0182 la 2 5. W is the width in in. 5 types of rain gutters to consider for your home find out if your home needs rain gutters and which materials are the most durable diy friendly and cost effective. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

To limit the effects of thermal expansion in gutters 50 ft. Five inch k style gutters six inch half round. Half round 5 inch 2 500 square feet 6 inch 3 840 square feet. 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.

5 inch 5 520 square feet. However too large a gutter downspout can look unattractive. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. Then use the chart below to see what size gutter you need.

They can be 4 5 or 6 inches.