A rain chain is an open alternative to a downspout: a chain of links or cups hung from a gutter outlet that guides water to the ground in plain view. The Japanese name, kusari-doi, translates as “chain gutter.”
It hangs from the same opening a downspout would use. When Gutter Solutions LLC forms a new seamless run, that outlet can be cut exactly where the chain should hang rather than where a downspout used to be.
Do rain chains work in heavy rain?
Short answer: up to a point. In a steady rain, water follows a rain chain neatly to the ground. In a hard downpour, more water leaves the outlet than the chain can guide, and the excess sheets off, splashes and can overshoot the base. That is why rain chains belong on low-flow outlets, not on the outlet a whole roof drains to.
Cup chains cope better than open links. Each cup catches the flow and passes it to the next through a hole in its base, so less water escapes sideways. Link chains look lighter, but they give water more chances to spray off in heavy flow or wind.
Summer downpours in Southeast Georgia
The local climate decides where a chain can go. At Savannah’s airport, NOAA’s 1991–2020 normals put about 22 of the year’s 48 inches of rain — roughly 46% — in June through September, the season of afternoon thunderstorms. That is exactly when a chain on the wrong outlet gets overwhelmed.
- Not on a main outlet. If an outlet drains a large area of roof, or sits below a valley where two slopes meet, keep a downspout there.
- Not where splash matters. Keep chains clear of doors, steps, walkways and windows that would take the spray.
- Somewhere to overflow. Assume the worst storms will overwhelm the chain, and make sure the water that misses it lands on stone or planting, not bare soil against the foundation.
Getting the gutter itself right helps too: a trough and outlet sized for the roof spread the flow so no single outlet takes more than it should.
Wind is the coastal test
An unanchored chain swings in every gust, throws water sideways and can knock against siding, glass or the gutter itself. Anchor the foot to a stake, a basin or a ground anchor so it hangs plumb — and take it down or tie it off when a tropical storm is forecast, as our storm-prep checklist suggests.
Copper is the classic choice: it starts bright, darkens to brown and, with time, to a green patina, and it pairs naturally with copper gutters. Painted aluminum chains suit painted aluminum systems.
Mind the metals. Copper and aluminum should not touch — in humid, salty air the aluminum corrodes where they meet — so a copper chain on an aluminum gutter needs a compatible hanger at the outlet. For more on how the two metals behave on the coast, see aluminum vs. copper.
Key points
- Rain chains suit low-flow outlets at porches, entries and courtyards.
- Downspouts stay on main outlets, below valleys and on large roof areas.
- Cup chains control splash better than open links.
- Every chain needs a base — basin, gravel or a drain inlet — and an anchored foot.