Calculate Box Gutter Size

Sizes the depth shown of the box gutter is the depth at the upstream end.

Calculate box gutter size. We recommend using this calculator as a basic tool to begin determining the requirements for your drainage system however all information should be verified by. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 6 inch 7 960 square feet.

Must have a constant slope between 1 40 and 1 200. Sides must be vertical. 5 inch standard k style gutter shop 5 gutterbrush. Measure your gutter across the top from the back where the gutter meets the home to the outer edge.

Doubling the number of downspouts halves the required capacity for each. Then use the chart below to see what size gutter you need. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Northclad gutter size requirement calculator this calculator uses current data to calculate the required size of gutter as well as number and size of downspouts based on your input.

Box gutters must be straight no bends. 5 inch 5 520 square feet. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. Learn more how to storm water design for building sites.

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