Sizing Downspout To Gutters

The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.

Sizing downspout to gutters. Compatible with 2 in. The larger a gutter downspout the more water it can drain quickly. 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.

More product details close. The gutter outlet capacity should suit the downspout capacity. Now that we are well aware of the various gutter downspout sizes and styles let us dig deeper into the materials used for effective downspouts and how much they shall cost. Gutters and gutter downspout sizes gutters are typically round shape or k style but other designs are available.

Then use the information below to see what size gutter you need. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 5 inches and 6 inches gutters are the most common sizes installed for residential use.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Metal or vinyl downspouts this versatile downspout has a lifetime guarantee. Offset of more than 10 ft 3 0 m can affect drainage capacity. However too large a gutter downspout can look unattractive.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Downspout sizes must not exceed the bottom width of the gutter. Size downspouts to fit the gutter. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage.

Most downspouts are rectangular but they can also be round or square. The downspout size must suit. Then use the chart below to see what size gutter you need. Gutter downspout sizes are 3 to 6 inches.

6 inch 7 960 square feet. 15 m is a practical maximum gutter length to be served by a downspout. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

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 durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation. 5 inch 5 520 square feet. They are made from aluminum vinyl zinc copper or stee l.

Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. The size of the downspout should be constant through out its length. Doubling the number of downspouts halves the required capacity for each.