Calculate Size Of Gutters

Rainfall intensity is measured in a 5 minute interval translated.

Calculate size of gutters.

Find the rainfall intensity for your locale. Measure the roof to get the watershed area the area from which water will run off. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Multiply length peak to. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. The steeper a roof s pitch the more windblown rain it can collect. Downspout sizes must not exceed the bottom width of the gutter.

Adjusting for pitch and rainfall. 15 m is a practical maximum gutter length to be served by a downspout. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.

How to calculate gutter and downspout capacity step 1. Measure the length of each gutter run. Run the tape measure from 1 corner of the gutter as far as you can go toward. To limit the effects of thermal expansion in gutters 50 ft.

5 inch standard k style gutter shop 5 gutterbrush. If a roof s various drainage areas call for different size gutters go for the biggest one k style. How do you calculate gutter size. Measure the height of.

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. 5 inch 5 520 square feet.