Roof Gutter Sizes

Five inch k style gutters six inch half round.

Roof gutter sizes.

The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. They can be 4 5 or 6 inches. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. Half round gutter sizing is based on w 0 0182 la 2 5.

15 m is a practical maximum gutter length to be served by a downspout. Gutter downspout sizes are 3 to 6 inches. Most downspouts are rectangular but they can also be round or square. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

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. I denotes rainfall intensity the roof area in square feet sq m. Downspout sizes must not exceed the bottom width of the gutter. The larger a gutter downspout the more water it can drain quickly.

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. 6 inch 7 960 square feet. 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.

Then use the chart below to see what size gutter you need. 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. Gutters come in different sizes. 5 inch 5 520 square feet.

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. W is the width in in. However too large a gutter downspout can look unattractive.

There are two main common sizes of gutters and one of them is 5 inch.