Rain Gutter Downspout Sizes

You ll need drop outlets to connect the gutters to the downspouts.

Rain gutter downspout sizes.

Downspout sizes are based on table 1 3 dimensions of standard downspouts page 1 4 of the architectural sheet metal manual 7th edition. Most downspouts are rectangular but they can also be round or square. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage. The size of the downspout should be constant through out its length.

Downspouts should be constructed with conductor. Then use the information below to see what size gutter you need. Downspout sizes must not exceed the bottom width of the gutter. This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Downspout sizing in sizing downspouts the following considerations apply. Downspouts are most commonly seen attached to the corners of home or building. 5 inch 5 520 square feet.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Compatible with 2 in. 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. Gutter end caps close off the ends of gutters keeping debris and water from flowing out at this point.

Gutter hangers and gutter brackets allow gutters to attach to a house s eaves offering support and strength to the front edge. The second most common style of downspouts in urban homes is the rectangular downspout coming under a range of sizes such as 2 3 3 4 and 4 5. More product details close. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.

Gutter downspout sizes are 3 to 6 inches. Then use the chart below to see what size gutter you need. However too large a gutter downspout can look unattractive. Metal or vinyl downspouts this versatile downspout has a lifetime guarantee.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Doubling the number of downspouts halves the required capacity for each. Without perfectly working downspouts rainwater will fall off the roofs edge and may cause flooding and damage to the building. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Rain water will pass through the cracks in the walls windows and into the buildings foundation. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. 5 inch 5 520 square feet. Downspouts of less than 7 00 sq in 4515 sq mm cross section should not be used except for small areas such as porches and canopies.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. The larger a gutter downspout the more water it can drain quickly.