Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Gutter dimensions us.
See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.
Downspouts are commonly 2 x 3 inches and 3 x 4 inches in size or 3 or 4 inches in diameter.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
The size of the downspout should be constant through out its length.
They can be 4 5 or 6 inches.
Then use the chart below to see what size gutter you need.
5 inch 5 520 square feet.
Most downspouts are rectangular but they can also be round or square.
7 and greater are appropriate for churches and larger commercial buildings.
The larger a gutter downspout the more water it can drain quickly.
Gutter downspout sizes are 3 to 6 inches.
The most common gutter sizes are 5 inches and 6 inches although 4 inches is available as well.
Offset of more than 10 ft 3 0 m can affect drainage capacity.
The sizes available in this style are 3 4 5 and 6.
Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.
Measure your gutter across the top from the back where the gutter meets the home to the outer edge.
The gutter outlet capacity should suit the downspout capacity.
For half rounds 5 inch should be used for up to 2500 sq feet and 6 inch for up to 3 840 sq ft.
5 inch standard k style gutter shop 5 gutterbrush.
Gutters come in different sizes.
K style sizes will typically range from 5 to 6.
Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum.
This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system.
It also comes in sizes 2 3 and 3 4.
But houses with big steep roofs or those located in climates prone to heavy downpours may need wider gutters and extra downspouts to keep rainwater from overflowing.
According to this old house while 5 inch k style gutters and 6 inch half rounds are usually suitable for homes houses with big steep roofs or those located in climates prone to heavy downpours may need wider gutters and extra downspouts to keep rainwater from overflowing.
Round downspouts come in various sizes and colors and mostly used with half round gutters.
However too large a gutter downspout can look unattractive.
Gutter style gutters are typically k style and half round styles though custom profile are available.
You should have enough gutter downspouts to effectively handle the size of your entire gutter system.
After you have calculated the square footage use following calculations.
6 inch 7 960 square feet.