Roof Gutter Sizes

The larger a gutter downspout the more water it can drain quickly.

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. Half round 5 inch 2 500 square feet 6 inch 3 840 square feet. 6 inch 7 960 square feet. 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.

This is most common in the k style gutters. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 5 inch 5 520 square feet. I denotes rainfall intensity the roof area in square feet sq m.

To limit the effects of thermal expansion in gutters 50 ft. 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. Most downspouts are rectangular but they can also be round or square. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.

They can be 4 5 or 6 inches. 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. W is the width in in.

Half round gutter sizing is based on w 0 0182 la 2 5. Downspout sizes must not exceed the bottom width of the gutter. If a roof s various drainage areas call for different size gutters go for the biggest one k style. There are two main common sizes of gutters and one of them is 5 inch.

Gutters come in different sizes. Gutter downspout sizes are 3 to 6 inches. 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.

However too large a gutter downspout can look unattractive.