Roof Gutter Sizes

Most downspouts are rectangular but they can also be round or square.

Roof gutter sizes.

Gutters come in different sizes. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website. The larger a gutter downspout the more water it can drain quickly. Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. Gutter downspout sizes are 3 to 6 inches. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

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. There are two main common sizes of gutters and one of them is 5 inch. Downspout sizes must not exceed the bottom width of the gutter. Half round 5 inch 2 500 square feet 6 inch 3 840 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. Then use the chart below to see what size gutter you need. Half round gutter sizing is based on w 0 0182 la 2 5. They can be 4 5 or 6 inches.

To limit the effects of thermal expansion in gutters 50 ft. 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. Five inch k style gutters six inch half round. 15 m is a practical maximum gutter length to be served by a downspout.

This is most common in the k style gutters. I denotes rainfall intensity the roof area in square feet sq m. 6 inch 7 960 square feet. W is the width in in.

5 inch 5 520 square feet.