Gutter Downspout Measurements

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.

Gutter downspout measurements.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Downspouts should be constructed with conductor. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage. Using a ladder will save you time with these measurements.

Then use the chart below to see what size gutter you need. More product details close. Downspouts are sized in relation to rainfall on this basis. Gutter professionals have experience matching the gutters and the downspouts.

However too large a gutter downspout can look unattractive. 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. 6 inch 7 960 square feet. How to measure downspouts.

Use that figure to calculate what size downspouts are needed for your roof. As with gutters a downspout s capacity must match or exceed the expected runoff. 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 chart below to figure out how many extra downspouts you need.

The size of the downspout should be constant through out its length. Gutter downspout sizes are 3 to 6 inches. 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. Most downspouts are rectangular but they can also be round or square.

The above recommendations assume that you have properly sized downspouts every 40 feet. 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. Compatible with 2 in.

As far as downspouts go they run at 2 x3 and 3 x4 in size or 3 or 4 inches in diameter. Use table 1 2 in reference 1 to find the amount in square inches of. You can use the same method to calculate the downspouts on your gutter system. The twine can be taped to bends and elbows as you move down towards the ground to provide you with an idea of the extra length needed at these points.

5 inch 5 520 square feet. Metal or vinyl downspouts this versatile downspout has a lifetime guarantee. This durable downspout is maintenance free and has uv stabilizers to help prevent uv light degradation.