Calculate Size Of Gutters

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.

Calculate size of gutters.

Measure the length of each gutter run. 5 inch 5 520 square feet. 5 inch standard k style gutter shop 5 gutterbrush. The steeper a roof s pitch the more windblown rain it can collect.

Measure the height of. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Find the width of the gutters. Find the rainfall intensity for your locale.

See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. 15 m is a practical maximum gutter length to be served by a downspout. Rainfall intensity is measured in a 5 minute interval translated. 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. Measuring existing gutters 1. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. 6 inch 7 960 square feet.

Downspout sizes must not exceed the bottom width of the gutter. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. How do you calculate gutter size. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Adjusting for pitch and rainfall. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Then use the chart below to see what size gutter you need.