What are the parts of the gutters on a home, and how do they work?
Short answer. The gutters on a home are a system: the roof edge metal sends water into a sloped trough hung from the fascia, which carries it to outlets and downspouts, and extensions or underground drains release it away from the foundation. Each part matters, and a failure at any one of them, from a loose hanger to a crushed elbow, shows up as overflow or rot.
The parts, top to bottom
- Drip edge or gutter apron. Metal along the roof edge that carries water off the shingles and into the gutter instead of letting it roll back onto the fascia.
- Fascia. The board along the rafter ends that the gutter is screwed to. If it is soft, nothing hung on it stays put.
- Gutter trough. Usually K-style aluminum in 5-inch or 6-inch widths. It is set with a slight fall toward each outlet, commonly about a quarter inch per 10 feet.
- Hangers. Brackets that hold the trough to the fascia. Hidden hangers clip inside the front lip and screw through the back; older homes often have spikes driven through ferrules.
- Miters and end caps. Inside and outside corners where runs meet, and caps that close the ends. These joints are the most common leak points.
- Outlets. The openings cut in the bottom of the trough where water drops into the downspout.
- Downspouts and elbows. Vertical pipes, commonly 2 by 3 inch or 3 by 4 inch rectangular, with elbows that route them along the wall.
- Extensions, splash blocks or underground drains. The last few feet that decide whether water ends up away from the house or in your crawl space.
- Guards (optional). Mesh, screens or hoods over the trough to keep debris out.
How to check yours
During a hard rain, walk around the house. Water should enter every run, move toward the outlets, and leave each downspout at full flow. Drips at corners, water sheeting over the front, and puddles at the base of a downspout each point to a specific part. For the roof edge pieces, see roof anatomy explained and drip edge explained.