An inch of rain on a typical roof sends hundreds of gallons of water toward the ground. Gutters and downspouts decide where that water goes: away from your house, or straight down beside your foundation.
Seamless gutters are formed on site from a continuous coil of aluminum, so the only joints are at corners and downspouts. Fewer seams means fewer places to leak, sag, or separate over time.
Pitch matters as much as the gutter itself. A run that's level or pitched the wrong way holds standing water, which freezes in winter and pulls the gutter off the fascia. We set every run with a steady slope toward a downspout sized for the roof area it drains.
Downspouts should discharge several feet from the foundation, onto ground that slopes away from the house. On tight lots in Passaic, Paterson, and Garfield, that sometimes means routing extensions along a side yard or toward the street.
If your gutters overflow in a heavy rain, pull away from the house, or leave stains on the siding, it's worth having them looked at before winter. A new seamless system usually goes in within a single day.