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.

Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed. Gutters come in different sizes. Measure your gutter across the top from the back where the gutter meets the home to the outer edge. A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.

See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. You ll also need to. You can measure pitch with a. Gutters come in different sizes.

Once you know the total square footage of drainage for each gutter you ll need to adjust for the following two factors. What size gutters do you need. Size downspouts to fit the gutter. 5 gutters and 6 gutters can both be used together for different areas.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted. 5 inch standard k style gutter shop 5 gutterbrush. They can be 4 5 or 6 inches. How do you do the math to figure out how large your gutters should be.

Adjusting for pitch and rainfall. How do you calculate gutter size. Most homes can be satisfied with 5 gutters. Houses with larger roofs may require 6 gutters because they flow more water.

Downspouts also come in.