Calculate Box Gutter Size

Sides must be vertical.

Calculate box gutter size.

Down pipe must be vertical from sump not to the side minimum sump length is 400mm. 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. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. 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. 6 inch 7 960 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. 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.

Learn more how to storm water design for building sites. Box gutters must be straight no bends. Must have a constant slope between 1 40 and 1 200. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Size downspouts to fit the gutter. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Doubling the number of downspouts halves the required capacity for each. Sizes the depth shown of the box gutter is the depth at the upstream end.

Then use the chart below to see what size gutter you need.