How Big Of Gutter Do I Need

The steeper a roof s pitch the more windblown rain it can collect.

How big of gutter do i need. 5 inch standard k style gutter shop 5 gutterbrush. Adjusting for pitch and rainfall. You ll also need to. What size gutters do you need.

Calculate your roof. You can measure pitch with a. Gutters come in different sizes. Measure your gutter across the top from the back where the gutter meets the home to the outer edge.

Downspouts also come in. See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. Roof pitch factor the steeper a roof s pitch the more windblown rain it can collect. Consider your drainage area.

How do you calculate gutter size. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour. They can be 4 5 or 6 inches. Once you know the total square footage of drainage for each gutter you ll need to adjust for the following two factors.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. Houses with larger roofs may require 6 gutters because they flow more water. Gutters come in different sizes. Size downspouts to fit the gutter.

Most homes can be satisfied with 5 gutters.