Calculate Size Of Gutters

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

Calculate size of gutters.

Find the width of the gutters. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Run the tape measure from 1 corner of the gutter as far as you can go toward. Measure the length of each gutter run.

To limit the effects of thermal expansion in gutters 50 ft. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. 5 inch 5 520 square feet. Multiply length peak to.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Downspout sizes must not exceed the bottom width of the gutter. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Measure the roof to get the watershed area the area from which water will run off. The steeper a roof s pitch the more windblown rain it can collect. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. 15 m is a practical maximum gutter length to be served by a downspout.

Rainfall intensity is measured in a 5 minute interval translated. How do you calculate gutter size. Adjusting for pitch and rainfall. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

Find the rainfall intensity for your locale. Measure the height of. How to calculate gutter and downspout capacity step 1.