Five inch k style gutters six inch half round.
Roof gutter dimensions.
The larger a gutter downspout the more water it can drain quickly.
Half round gutter sizing is based on w 0 0182 la 2 5.
Half round adjusted square footage of roof.
5 inch 5 520 square feet.
Metal corrosion issues all gutter and components must be the same to prevent electrolysis or electrical corrosion.
6 inch 7 960 square feet.
I denotes rainfall intensity the roof area in square feet sq m.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
Most downspouts are rectangular but they can also be round or square.
For design purposes and aesthetics let s assume you have selected an 8 gutter.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
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.
5 inch 2 500 square feet.
6 inch 3 840 square feet.
You should have enough gutter downspouts to effectively handle the size of your entire gutter system.
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.
From the table we find that a 5 x5 downspout will discharge 260 gallons per minute.
At 1 880 gpm s we will need 8 downspouts to handle the rainfall 1 880 260 8 downspouts rounded up.
Gutter downspout sizes are 3 to 6 inches.
The required width of gutter is therefore 6 in 152 mm and its depth need be only 4 5 in 114 mm in.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
See galvonic corrosion for more detail.
This building has a parapet wall on three sides and a gutter to be located on an 80 ft 24 4 m side.
However too large a gutter downspout can look unattractive.
There are two most common type of residential gutters that we will talk about in this post for reliable roof gutter sizing.
Measure your gutter across the top from the back where the gutter meets the home to the outer edge.
Also assume our guttered eave is 335 linear feet.
W is the width in in.
Half round 5 inch 2 500 square feet 6 inch 3 840 square feet.