Rain Gutter Sizes

As a general rule egutter recommends for roof areas that exceed 2800 square feet a 6 k style size with a 3 x 4 downspout size would be appropriate.

Rain gutter sizes.

5 inch 5 520 square feet. Gutter downspout sizes are 3 to 6 inches. If a roof s various drainage areas call for different size gutters go for the biggest one k style. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

However too large a gutter downspout can look unattractive. Then use the chart below to see what size gutter you need. Half round 5 inch 2 500 square feet 6 inch 3 840 square feet. Measure your gutter across the top from the back where the gutter meets the home to the outer edge.

Most downspouts are rectangular but they can also be round or square. The larger a gutter downspout the more water it can drain quickly. Aluminum is the most popular material for rain gutters whether seamed or seamless. 6 inch 7 960 square feet.

Aluminum gutters come in three standard thicknesses 025 inch 027 inch and 032 inch. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.