Rain Chains on a St. Louis Gutter, and Where They Fail

A rain chain is a series of cups or links hung where a downspout would normally run. Water from the gutter outlet runs down the chain instead of through a closed pipe, and the cups make a visible, quiet path to the ground. Homeowners in St. Louis County often look at them for the look alone, and that is a fair reason to consider one. The trouble starts when the chain is treated as a decoration and not as part of the drainage system. A chain still has to carry the same water as the downspout it replaces, and it has to do that through the freeze and thaw cycles that this metro gets every winter.

What a rain chain does and does not do

A rain chain does not hold more water than a downspout. It does not reduce the volume of water coming off the roof, and it does not make a gutter that is undersized any better. Its job is to move water from the gutter outlet to a landing point. Whatever the gutter cannot send into the chain will spill over the front of the trough, the same as it would with a plain downspout that is too small for the roof area above it.

That matters because the question on most homeowners' minds is whether the chain will work with their existing gutter. The honest answer depends on three things: the roof area draining to that outlet, the size and position of the outlet, and whether the chain is hung from the outlet in a way that keeps the water inside the cups. If any one of those is wrong, the chain will overflow in a heavy rain even though the gutter looked fine on a dry day.

The outlet decides whether it works

The gutter outlet is the point where water leaves the trough. Many rain chains attach to a hopper head or a funnel at that outlet. The hopper or funnel has to be wide enough to catch the water coming down the trough during a storm, and it has to sit low enough that the water enters it and does not run past it. If the outlet is a small round opening at the end of a long run, a chain hung from it may only carry the water from the closest section of gutter.

Check where the outlet sits relative to the roof edge and the trough slope. A gutter that is level or pitched the wrong way can leave water sitting in the far section, and the chain at the outlet will not clear that water. The gutter should be checked for pitch before the chain is ordered, not after the first storm shows the problem. A roofer or gutter installer can measure the pitch and photograph the outlet so that the existing gutter and the new chain are looked at together.

The landing at the bottom

A rain chain needs a place for the water to go when it reaches the ground. Most installations use a catch basin, a gravel bed, or a splash block that is set so the water lands in a controlled spot. If the water lands on bare soil next to the foundation, it will wash out a shallow trench over a few seasons, and the soil at the foundation wall will stay wet longer than it should. Water at the foundation usually starts at the gutter line, and a chain that dumps the water onto the same soil does not change that.

The landing should be at least as far from the foundation as a downspout extension would send the water. If the house has a basement or a crawlspace, the landing point is part of the foundation plan, not just a yard detail. Ask where the water will land, and ask whether the landing spot is where you want it to be before the chain is installed. Once the chain is hung, changing the landing point usually means pulling the chain back down.

Freezing weather and the chain

St. Louis winters are not steady. The region goes through repeated cycles where the temperature climbs above freezing in the afternoon and drops below it overnight. That cycle is hard on any drainage path that holds water, and a rain chain holds water in many small places at once. Each cup can hold a film of water that freezes, and each link can grow an icicle. Over several weeks, the added weight can pull a chain away from its hanger, bend the outlet, or push the top connection out of line with the gutter.

Ice can also build up at the bottom of the chain, where water lands. A thick ice mass at the landing can force water back up the chain and over the gutter, which then runs down the fascia or into the soffit. This is one reason a chain needs a landing that drains freely in winter and does not sit in a pool. A chain that works well in July can still cause trouble in January if the landing point holds ice in place.

Before the first hard freeze, look at the top connection, the cups, and the bottom of the chain. Look for cracks in the cups, bends in the links, and any sign that the chain has moved away from the wall. If there is ice on the chain after a cold snap, check whether the water is still moving through it once the sun comes out. Water that stops moving is a sign that the chain or the outlet is blocked somewhere along the path.

Where a rain chain fits on a St. Louis house

Rain chains work best on a single-story section where the roof area draining to the outlet is modest and the landing point is open ground that can take the water without washing out. They are less suited to a two-story corner with a long run of gutter feeding one outlet, because the flow at the bottom is heavy and the chain can overflow in a storm. They are also a poor fit where the outlet sits above a patio, a window well or a walkway, unless the landing is designed for that use.

A rain chain can work well alongside a downspout on a different part of the house. The chain takes one outlet, the downspout takes another, and the two are sized for their own roof areas. Mixing the two on one gutter run can make the sizing harder to judge, so it is worth asking how the water will split between the outlets during a storm. Keys Roofing can measure the roof area feeding each outlet and document the connections with photos, and that record is useful when you compare options.

What to ask before you order one

Before buying or installing a rain chain, ask the following questions and get the answers in writing:

• What roof area drains to this outlet, and how was that measured?
• Is the outlet a hopper, funnel or fixed opening, and is it sized for the flow from the whole gutter run?
• Is the gutter pitched so that water moves toward the outlet during a heavy rain?
• Where will the water land, and is that spot clear of the foundation, windows and walkways?
• How is the chain attached to the wall or fascia, and what holds it away from the siding?
• What happens to the chain during a hard freeze, and who checks it after the first cold snap?
• What photos or measurements will be included with the written scope?

A written answer to each of these questions gives you something to compare when two options are on the table. A chain that looks identical on a catalog page can have very different outlets, landings and attachments once it is measured against the house. If you are weighing a chain against a downspout, call the Keys Roofing office at (314) 220-2333 and ask for the measurements and photos before deciding.