How Big Of Gutter Do I Need

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted.

How big of gutter do i need.

See photos below most residential gutters will measure approximately 5 inches across the top with the actual opening being approximately 4 5 inches. You can measure pitch with a. 5 inch standard k style gutter shop 5 gutterbrush. Houses with larger roofs may require 6 gutters because they flow more water.

Calculate your roof. Roof pitch factor the steeper a roof s pitch the more windblown rain it can collect. 5 gutters and 6 gutters can both be used together for different areas. Once you know the total square footage of drainage for each gutter you ll need to adjust for the following two factors.

Measure your gutter across the top from the back where the gutter meets the home to the outer edge. What size gutters do you need. How do you do the math to figure out how large your gutters should be. Roof area the locale s rainfall intensity and gutter capacity determine how many square inches of downspout are needed.

Size downspouts to fit the gutter. The steeper a roof s pitch the more windblown rain it can collect. They can be 4 5 or 6 inches. Downspouts also come in.

Adjusting for pitch and rainfall. Most homes can be satisfied with 5 gutters. Consider your drainage area. Gutters come in different sizes.

A square inch of downspout can drain 1 200 square feet of roof during a rain with an intensity of one inch per hour.