Calculate Size Of Gutters

15 m is a practical maximum gutter length to be served by a downspout.

Calculate size of gutters.

Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. 5 inch 5 520 square feet. 5 inch standard k style gutter shop 5 gutterbrush. Find the rainfall intensity for your locale.

Run the tape measure from 1 corner of the gutter as far as you can go toward. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Measure the roof to get the watershed area the area from which water will run off. How to calculate gutter and downspout capacity step 1.

Measure the height of. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. If a roof s various drainage areas call for different size gutters go for the biggest one k style. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches.

Downspout sizes must not exceed the bottom width of the gutter. Then use the chart below to see what size gutter you need. To limit the effects of thermal expansion in gutters 50 ft. The steeper a roof s pitch the more windblown rain it can collect.

Adjusting for pitch and rainfall. Measure the length of each gutter run. How do you calculate gutter size. Find the width of the gutters.

Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. Measuring existing gutters 1.