Calculate Box Gutter Size

5 inch standard k style gutter shop 5 gutterbrush.

Calculate box gutter size.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. 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. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 5 inch 5 520 square feet.

Must have a constant slope between 1 40 and 1 200. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. Down pipe must be vertical from sump not to the side minimum sump length is 400mm. Downpipe eaves gutter long straight eaves gutters box gutter to rain water head box gutter vertical faces box gutter side o flow box gutter vertical o flow storm water pipe size storm water network overland flow path spitter upstream end custom rain water head.

Learn more how to storm water design for building sites. Sizes the depth shown of the box gutter is the depth at the upstream end. 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.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. Box gutters must be straight no bends. Then use the chart below to see what size gutter you need.

Size downspouts to fit the gutter.