Before 5-inch gutters became omnipresent, smaller gutters generally had simple half-tube configurations. But the K-style profile has more depth. Of course, 5-inch K-type gutters outperform narrower models, as long as the drains and discharge pipes themselves allow as much unobstructed flow to the floor as possible. The optimal size of the gutter you need will depend on the amount of water the gutter needs to handle.
With so many pieces in play, standard gutters become problematic, since debris such as leaves, pine needles and twigs that fall into the system can easily get caught in the joints, causing the gutters to become clogged. In addition, larger gutters can better handle debris and are less likely to become clogged with leaves and other common items thrown into gutters. If your home has this feature, the lower gutters would benefit from being upgraded to 6-inch gutters to prevent overflows. Because the upper “mouth” of the gutter system is larger, it's easier to reach in and clean up debris.
On the other hand, if your roof plan is larger than 1,400 square feet, we recommend that you place 6-inch gutters, as this causes water to enter the gutters twice the amount of water. In recent years, more and more homeowners are making the switch from the standard 5-inch gutter to the large or commercial 6-inch gutter. In addition, since the 6-inch gutters cover the fascia board, they do not leave an uncomfortable space between the roof and the gutters. If the gutter can cause stormwater to flow quickly out of the roof, but finds a choke point in the downspouts, the width of the gutters won't make much difference.
In that case, the opening of the gutter is even smaller and it would be even more difficult to reach into the gutter system. To prepare your home for the next big downpour, consider replacing your gutter system with 6 larger gutters. If a gutter system is not large enough to accommodate the amount of roof runoff, the gutters will overflow. Seamless gutters differ from traditional gutter systems because they are not composed of multiple prefabricated sections that are spliced together.