How Many Square Feet Of Roof Per Downspout

Gutter and downspout water capacity.

How many square feet of roof per downspout.

To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity. Up to 6 12 7 12 8 12. Roof area square feet per linear ft of gutter underneath. Adding a 2 by 3 rectangular downspout for instance boosts your gutter s capacity by 600 square feet of drainage area.

Measuring the square feet of the roof along with knowledge of local rainstorms is invaluable when making. This nominal square footage amount is then multiplied by a factor associated with the roof s pitch. Many factors can effect the proper size of gutter. Use the chart below to figure out how many extra downspouts you need.

3 by 4 inches 1 200 square feet. 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. How many downspout installations should your gutters have.

Roof pitches in degrees. 4 inches 1 255 square feet. After you have calculated the square footage use following calculations. For the vast majority of rains gutter and downspouts.

Doubling the number of downspouts halves the required capacity for each. 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 the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 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.

Most of all is location and your average rainfall during a large downpour. Your roof is without a doubt one of the most important elements of your home.