How Many Square Feet Of Roof Per Downspout

If we have to sum it up in a single rule gutters need a downspout around every 30 to 40 feet.

How many square feet of roof per downspout.

For the vast majority of rains gutter and downspouts. 3 inches 706 square feet. Most of all is location and your average rainfall during a large downpour. To do that simply multiply drainage area calculated earlier by roof pitch factor and rainfall intensity.

Many factors can effect the proper size of gutter. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Measuring the square feet of the roof along with knowledge of local rainstorms is invaluable when making. 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.

Gutter and downspout water capacity. 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. 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. Up to 6 12 7 12 8 12. 4 inches 1 255 square feet. For most homes this means installing spouts at either end of a gutter section.

Use the chart below to figure out how many extra downspouts you need. 2 by 3 inches 600 square feet. How many downspout installations should your gutters have. Roof area square feet per linear ft of gutter underneath.

After you have calculated the square footage use following calculations. 3 by 4 inches 1 200 square feet.