Determining Gutter Size

Increasing the pitch increases a gutter s.

Determining gutter size. The steeper a roof s pitch the more windblown rain it can collect. How do you calculate gutter size. Find the width of the gutters. How to calculate gutter and downspout capacity step 1.

You have three options. 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. Find the rainfall intensity for your locale.

Get 7 or 8 inch gutters. Measuring existing gutters 1. Ratio of depth to width of gutter select gutter ratio 0 125x 0 25x 0 375x 0 5x 0 625x 0 75x 0 875x 1x 1 125x 1 25x 1 375x 1 5x 1 625x 1 75x 1 875x 2x calculate drainage reset. They ll cost more and probably require a custom order through a professional installer.

Adjusting for pitch and rainfall. Measure the roof to get the watershed area the area from which water will run off. Measure the height of. Measure the length of each gutter run.

Measure your gutter across the top from the back where the gutter meets the home to the outer edge. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. 5 inch standard k style gutter shop 5 gutterbrush. The standard is about inch per 10 feet.

Run the tape measure from 1 corner of the gutter as far as you can go toward.