Roof Gutter Dimensions

Most downspouts are rectangular but they can also be round or square.

Roof gutter dimensions.

Half round adjusted square footage of roof. W is the width in in. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Five inch k style gutters six inch half round.

5 inch 2 500 square feet. For design purposes and aesthetics let s assume you have selected an 8 gutter. I denotes rainfall intensity the roof area in square feet sq m. Also assume our guttered eave is 335 linear feet.

5 inch standard k style gutter shop 5 gutterbrush. 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. 6 inch 7 960 square feet. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

At 1 880 gpm s we will need 8 downspouts to handle the rainfall 1 880 260 8 downspouts rounded up. 6 inch 3 840 square feet. There are two most common type of residential gutters that we will talk about in this post for reliable roof gutter sizing. The larger a gutter downspout the more water it can drain quickly.

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. See galvonic corrosion for more detail. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Gutter downspout sizes are 3 to 6 inches. 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. 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.

The required width of gutter is therefore 6 in 152 mm and its depth need be only 4 5 in 114 mm in. Half round gutter sizing is based on w 0 0182 la 2 5. Metal corrosion issues all gutter and components must be the same to prevent electrolysis or electrical corrosion. You should have enough gutter downspouts to effectively handle the size of your entire gutter system.

5 inch 5 520 square feet.