Copper Gutters: Cost, Lifespan, and Upkeep

Copper gutters cost much more than aluminum up front, but they can last 50 years or more with little upkeep. The InterNACHI life expectancy chart, a home inspector reference, lists copper gutters at 50+ years and copper downspouts at 100 years. Copper does not need paint. It weathers from bright metal to brown and, over many years, to a green patina.

Copper suits some homes very well. On others, the money does more good somewhere else. Here is how I would think it through.

How long do copper gutters last compared to other materials?

The same InterNACHI chart gives these estimates:

The Copper Development Association (CDA), the copper industry's trade group, says in its design handbook that a well-designed copper gutter and downspout system will give many years of low-maintenance service. It also notes that other gutter metals need repainting or recoating to keep their durability, while copper does not.

Long life still depends on good work. A copper gutter that is hung poorly, pitched wrong, or joined badly will leak like any other.

What do copper gutters cost?

I will not quote a price here. Copper prices move with the metal market, and every house is different. What I can tell you is what drives the cost.

• The metal. Copper costs far more per pound than aluminum.
• The labor. Copper joints are usually soldered, not just sealed. That takes skill and time.
• The style. Copper is often paired with half-round gutters and round downspouts. Those need their own hangers and fittings.
• The trim. Copper gutters often call for copper or brass hangers, straps, and flashing details to match and to avoid metal contact problems.

The CDA argues that copper should be judged on life-cycle cost, not first cost. That means the price up front, plus upkeep, plus how long it lasts. Copper also keeps scrap value at the end of its life. Whether that math works for you depends on how long you plan to stay in the house.

How does copper patina form?

New copper is a bright salmon color. The CDA describes it weathering to reddish-brown, then slowly toward a gray-green patina.

The CDA explains that the green patina forms when acidic moisture in the air reacts with the copper. The patina sticks tightly to the surface and protects the metal from further weathering. The process is faster in cities and industrial areas, where there is more pollution in the air, and in marine areas.

The CDA's weathering chart for moist industrial climates runs from new copper to 25 to 30 years. It says the timespan varies. In a suburb with cleaner air, expect it to take longer. Temperature, humidity, drainage, and sun all change the rate. The north and south sides of the same house can weather at different speeds.

Expect a brown stage that lasts years before any green shows.

If you want copper to stay bright, clear coatings exist. The CDA's handbook shows one example where the coating needs reapplying every few years.

What can go wrong with copper gutters?

Copper is tough, but it has a few known problems. Ask about each one before you buy.

Contact with other metals. When two different metals touch in the presence of water, the less noble one corrodes. The CDA says copper is not harmed, but it will corrode aluminum and zinc it touches. Copper and aluminum should be kept apart with gaskets, tape, or compatible coatings. Water that runs off copper should not drain onto exposed aluminum, because the copper salts in it can speed up corrosion of the aluminum. Mixing copper gutters with aluminum downspouts, or copper above aluminum, is a mistake.

Acidic runoff from asphalt shingles. The CDA warns that rain running off a non-copper roof, such as asphalt shingles, stays acidic. When a lot of that water lands on a small copper gutter, the copper can wear before its protective patina forms. Shingle edges that rest right on the copper hold moisture there. The CDA calls the damage this causes "line corrosion." The CDA's fix is to raise the shingle edge with a cant strip or add a replaceable strip between the shingles and the copper. Many homes here have asphalt shingle roofs, so this one matters.

Green stains. Water that runs off copper carries tiny amounts of copper salts. The CDA says porous, light-colored materials such as limestone and marble can stain green as that water dries. Good gutters and downspouts that carry water away help prevent this.

Expansion. Copper grows and shrinks with temperature. Berger, a gutter maker, says a 50-foot copper gutter grows about 5/8 inch with a 100°F rise in temperature. The CDA calls for expansion joints no more than 48 feet apart on long straight runs. It also says each downspout should drain no more than 50 feet of gutter.

How do you maintain copper gutters?

Copper needs less care than painted metal, but it is not maintenance-free.

1. Clean out leaves and debris each fall and spring, like any gutter.
2. Do not scrub the patina off. It protects the metal.
3. Check soldered joints and seams for drips during a rain.
4. Keep shingle edges from resting directly on the copper.
5. Watch for green staining on stone or light siding below and correct the drainage.
6. Check that hangers are tight and pitch is right.

Are copper gutters right for your home?

Copper makes the most sense in a few cases.

• Older and historic homes where the look matters and copper fits the style. Cincinnati's older neighborhoods have many of these.
• Homes with stone or brick fronts where copper trim is part of the design.
• Owners planning to stay a long time who would rather pay once than replace aluminum later.

It makes less sense on a house you plan to sell soon, or where the budget is better spent on the roof itself.

How Shamrock can help

We install, replace, and repair seamless gutters across northern Cincinnati. Copper is specialty work. If you are thinking about it, we can look at your roof edge and drainage during a free estimate. We will talk through options such as seamless aluminum and tell you plainly whether copper is a job we would take on. Whoever installs copper, ask about their soldering experience. Also ask how they will keep copper away from other metals.

FAQ

Do copper gutters turn green? Over time, yes, but slowly. They turn brown first. The green patina can take many years, and in cleaner suburban air it can take longer than in a city.

Can copper gutters be mixed with aluminum parts? Not where they touch or where copper runoff reaches the aluminum. The CDA warns that copper corrodes aluminum in contact. Use copper or compatible materials throughout.

Do copper gutters need to be painted? No. Copper does not need paint. A clear coating can keep it bright, but plan on reapplying it.

Are copper gutters worth it on a house with an asphalt shingle roof? They can be, if the installer plans for acidic runoff and keeps the shingle edges off the copper. Ask how they will handle it.

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