Calculate Size Of Gutters

Measure the height of.

Calculate size of gutters. Adjusting for pitch and rainfall. 15 m is a practical maximum gutter length to be served by a downspout. 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.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Measure the length of each gutter run. Calculations are based on level gutter capacity as experimentally determined by the national institute of standards and technology nist.

5 inch standard k style gutter shop 5 gutterbrush. Measuring existing gutters 1. Find the rainfall intensity for your locale. To limit the effects of thermal expansion in gutters 50 ft.

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

Rainfall intensity is measured in a 5 minute interval translated. Multiply length peak to. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. The steeper a roof s pitch the more windblown rain it can collect.

Run the tape measure from 1 corner of the gutter as far as you can go toward. Find the width of the gutters. How to calculate gutter and downspout capacity step 1.