Determining Gutter Size

Measure the roof to get the watershed area the area from which water will run off.

Determining gutter size.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. The steeper a roof s pitch the more windblown rain it can collect. Adjusting for pitch and rainfall. Run the tape measure from 1 corner of the gutter as far as you can go toward.

Get 7 or 8 inch gutters. 5 inch standard k style gutter shop 5 gutterbrush. Find the rainfall intensity for your locale. The standard is about inch per 10 feet.

How to calculate gutter and downspout capacity step 1. Measure the height of. How do you calculate gutter size. Increasing the pitch increases a gutter s.

Increase the pitch of the gutter. They ll cost more and probably require a custom order through a professional installer. Place a sturdy 20 ft 6 1 m ladder on 1 side of your house so that you can reach. Find the width of the gutters.

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. Multiply length peak to. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. Rainfall intensity is measured in a 5 minute interval translated.

Measure your gutter across the top from the back where the gutter meets the home to the outer edge.