Rain Water Gutter Size

5 inch 5 520 square feet.

Rain water gutter size.

Doubling the number of downspouts halves the required capacity for each. Size downspouts to fit the gutter. However too large a gutter downspout can look unattractive. Adding additional sections of gutter reduces the length of each section and will reduce the gutter size.

6 inch 7 960 square feet. Gutter downspout sizes are 3 to 6 inches. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Also the gutter width in relation to height may also be adjusted.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Unless special provisions are made for flexibility in downspouts rain gutters and their support systems gutters should expand away from downspouts and downspouts should not be located near gutter expansion joints. Five inch k style gutters or 6 inch half rounds the most common residential sizes are able to handle the rainfall on most houses in most parts of the country. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Then use the chart below to see what size gutter you need. The gutter and downspout size requirement depends upon the number of sections and length of the gutter sections as well as the number of downspouts. Use this handy guide to make sure your rain collection is up to the task during even the heaviest storm.

To limit the effects of thermal expansion in gutters 50 ft 15 3 m is a practical maximum length of gutter to be served by a downspout. You should have enough gutter downspouts to effectively handle the size of your entire gutter system. If a roof s various drainage areas call for different size gutters go for the biggest one k style. The larger a gutter downspout the more water it can drain quickly.