Roof Gutter Dimensions

Measure your gutter across the top from the back where the gutter meets the home to the outer edge.

Roof gutter dimensions.

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. The required width of gutter is therefore 6 in 152 mm and its depth need be only 4 5 in 114 mm in. Then use the chart below to see what size gutter you need. 6 inch 7 960 square feet.

Most downspouts are rectangular but they can also be round or square. Half round gutter sizing is based on w 0 0182 la 2 5. There are two most common type of residential gutters that we will talk about in this post for reliable roof gutter sizing. 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. I denotes rainfall intensity the roof area in square feet sq m. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. Half round 5 inch 2 500 square feet 6 inch 3 840 square feet.

Half round adjusted square footage of roof. This building has a parapet wall on three sides and a gutter to be located on an 80 ft 24 4 m side. See galvonic corrosion for more detail. Sample problem to size a half round gutter for a build ing located in kansas city mo with a flat roof 80 x 40 ft 24 4 x 12 2 m.

Five inch k style gutters six inch half round. Gutter downspout sizes are 3 to 6 inches. The larger a gutter downspout the more water it can drain quickly. At 1 880 gpm s we will need 8 downspouts to handle the rainfall 1 880 260 8 downspouts rounded up.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. When you are considering what kind of gutters to get keep in mind that different gutter shapes have a significant impact on the capacity of the gutter. Metal corrosion issues all gutter and components must be the same to prevent electrolysis or electrical corrosion. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

For design purposes and aesthetics let s assume you have selected an 8 gutter. 6 inch 3 840 square feet. Also assume our guttered eave is 335 linear feet. 5 inch 2 500 square feet.

5 inch 5 520 square feet.