How Many Square Feet Of Roof Per Downspout

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

How many square feet of roof per downspout.

For the vast majority of rains gutter and downspouts. For a 5 inch k style gutter the square footage should be up to 5 500 sq ft and for a 6 inch k style gutter the square footage should be upto 7 900 sq ft. Roof area square feet per linear ft of gutter underneath. Gutter and downspout water capacity.

How many downspout installations should your gutters have. 2 by 3 inches 600 square feet. If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet. Roof pitches in degrees.

Up to 6 12 7 12 8 12. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. For most homes this means installing spouts at either end of a gutter section. 3 by 4 inches 1 200 square feet.

Most of all is location and your average rainfall during a large downpour. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Doubling the number of downspouts halves the required capacity for each. Measuring the square feet of the roof along with knowledge of local rainstorms is invaluable when making.

Many factors can effect the proper size of gutter. Your roof is without a doubt one of the most important elements of your home. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area. Use the chart below to figure out how many extra downspouts you need.

4 inches 1 255 square feet. As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house.