Gutter Downspout Measurements

Metal or vinyl downspouts this versatile downspout has a lifetime guarantee.

Gutter downspout measurements.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. How to measure downspouts. 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. Most downspouts are rectangular but they can also be round or square.

Gutter professionals have experience matching the gutters and the downspouts. The larger a gutter downspout the more water it can drain quickly. If a roof s various drainage areas call for different size gutters go for the biggest one k style. In sizing downspouts the following considerations apply.

The size of the downspout should be constant through out its length. 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. Use that figure to calculate what size downspouts are needed for your roof. Use the chart below to figure out how many extra downspouts you need.

More product details close. For example a 6 inch k style gutter requires a 3 x 4 downspout while a 5 inch k style gutter uses a 2 x 3 downspout. However too large a gutter downspout can look unattractive. As with gutters a downspout s capacity must match or exceed the expected runoff.

Step 3 understand that it takes 96 15 square feet of surface with 1 inch per hour of rainfall to correspond with 1 gpm of flow rate. Using a ladder will save you time with these measurements. 6 inch 7 960 square feet. Downspouts are sized in relation to rainfall on this basis.

You can use the same method to calculate the downspouts on your gutter system. Compatible with 2 in. 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. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage.

Gutter downspout sizes are 3 to 6 inches. This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation. Downspouts should be constructed with conductor. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.

Then use the chart below to see what size gutter you need. Use table 1 2 in reference 1 to find the amount in square inches of. The above recommendations assume that you have properly sized downspouts every 40 feet.