Gutter Downspout Measurements

How to measure downspouts.

Gutter downspout measurements.

Then use the chart 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. Use that figure to calculate what size downspouts are needed for your roof. Use the downspout to redirect runoff and help prevent garden erosion and foundation damage.

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. Downspouts are sized in relation to rainfall on this basis. Gutter downspout sizes are 3 to 6 inches. 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.

6 inch 7 960 square feet. As with gutters a downspout s capacity must match or exceed the expected runoff. 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. As far as downspouts go they run at 2 x3 and 3 x4 in size or 3 or 4 inches in diameter.

Using a ladder will save you time with these measurements. 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. In sizing downspouts the following considerations apply. 5 inch 5 520 square feet.

Most downspouts are rectangular but they can also be round or square. Compatible with 2 in. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. The larger a gutter downspout the more water it can drain quickly.

Gutter professionals have experience matching the gutters and the downspouts. You can use the same method to calculate the downspouts on your gutter system. Metal or vinyl downspouts this versatile downspout has a lifetime guarantee. 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. The size of the downspout should be constant through out its length. Use the chart below to figure out how many extra downspouts you need. Use table 1 2 in reference 1 to find the amount in square inches of.

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. 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. More product details close.