The most common gutter width increased from four inches to five. This growth helped solve some problems with gutter overflow in heavy rains since the larger troughs could carry more water. But if five inches is good, why not six? Depending on a few factors, pricier six-inch gutters could be overkill. Legacy Gutters has years of experience with seamless gutter fabrication and installation. Here's what you need to know about modern eaves troughs.