Aluminum Wiring in Pittsburgh Mid-Century Homes: Pigtail, Replace, or Leave It Alone?

Between roughly 1965 and 1973, a lot of Pittsburgh homes were wired with aluminum branch circuits instead of copper. Copper prices were high, aluminum was a cheaper alternative, and at the time nobody knew that the combination of aluminum wire and standard copper-rated devices would cause the problems it did. Today, houses of that era still have some or all of their original aluminum wiring, and homeowners get caught off guard when a home inspector or insurance company flags it.

Renaissance Electric handles partial and complete rewiring in Pittsburgh, including the older homes this article is about.

Here’s what aluminum wiring actually is, why it’s a known issue, and what your realistic options are in a Pittsburgh home.

What’s the problem with aluminum?

Aluminum expands and contracts with temperature more than copper does. The connection point at an outlet, a switch, or a light fixture goes through thermal cycling every time the circuit is loaded. Over years, an aluminum wire under a standard copper-rated screw loosens slightly, then more, then the connection heats up under load, oxidizes, and eventually arcs. Arcing in a wall is how wiring fires start.

The wire itself is fine. The connection points are the problem. That distinction matters because it tells you what the fix is.

How to tell if your Pittsburgh house has aluminum

1. Year of construction: homes built 1965 to 1973 are the highest risk. Earlier or later homes occasionally had aluminum too but less commonly.
2. Look in the panel: aluminum branch-circuit wire is silver-colored. Copper is, well, copper. The individual branch circuits landing on the breakers tell you immediately.
3. Check outlet cover plates: aluminum-compatible receptacles are marked CO/ALR. If you see ordinary outlets with aluminum wiring underneath, that’s the high-risk combo.
4. Look at a junction box: pop a cover plate on a few outlets. Silver wire under a standard brass screw = aluminum with a bad connection.

If you’re not sure, we can walk through a house in 20 minutes and tell you exactly what’s there.

Important: aluminum service entrance vs. aluminum branch circuits

Aluminum is still used for service entrance wires (the thick feeders from the meter to the panel) and for feeders to sub-panels. That’s code-legal and safe because those large-gauge aluminum conductors terminate on lugs specifically designed for them.

The problem is only with small-gauge aluminum (usually 12 AWG or 10 AWG) used for 15-amp and 20-amp branch circuits. When people talk about aluminum wiring problems, that’s what they mean.

Your three options

Option 1: Leave it alone

If every outlet, switch, and fixture in the house has been updated with CO/ALR-rated devices, and everything looks solid, the house is relatively safe. Many 1970s Pittsburgh homes have been retrofitted over the years and the aluminum wiring is functional.

Downside: you still have an insurance flag, a home-sale disclosure, and an ongoing maintenance task. Every time an outlet needs replacement, it has to be a CO/ALR-rated one, and the connection has to be made correctly.

Option 2: Pigtail the connections (COPALUM or AlumiConn)

Pigtailing means attaching a short length of copper wire to each aluminum wire at every connection point, using an approved splice connector. The device (outlet, switch) then lands on the copper pigtail, which is safe and standard.

There are two approved methods:

• COPALUM: a special crimp tool and copper sleeve. The gold standard, but the tool is proprietary and only certified electricians have it.
• AlumiConn: a three-port purple connector you can install with a torque screwdriver. Approved by the CPSC and easier to find.

A typical Pittsburgh pigtail job with AlumiConn is priced per device. A whole-house pigtail (60 to 80 devices) varies with access and complexity. The home no longer requires CO/ALR devices, and the insurance flag usually clears.

Option 3: Full rewire

Strip all aluminum branch circuits and replace with copper. This is the most complete fix and the most expensive. The cost of a rewire depends on the size of the home, wall access, and finishes. Usually done as part of a major renovation when walls are already opening.

If you’re already remodeling the kitchen or finishing a basement, the incremental cost to rewire those areas is relatively small. Whole-house rewire is rarely worth it if pigtailing is an option.

Insurance

Most insurance carriers in Pennsylvania will write homeowners policies on aluminum-wired homes only if:

• All devices are CO/ALR-rated, OR
• All connections are pigtailed with an approved method, with documentation

Some carriers won’t write at all. Some charge a surcharge. It varies year to year. If you’re getting quoted higher rates or dropped, the fix is usually a whole-house AlumiConn pigtail and a signed letter from a licensed electrician.

What we recommend

For most Pittsburgh mid-century homes, AlumiConn pigtailing across the whole house is the sweet spot: safer than doing nothing, much cheaper than a full rewire, and accepted by insurance. We usually do it in one or two long days for an average-sized home.

If you’re about to sell, pigtailing is a strong play. The listing can say the aluminum has been addressed, and buyers don’t flinch.

If you bought the house 20 years ago and nothing has ever gone wrong, the danger isn’t zero but it’s lower than the statistics suggest (those assume original installs with no updates). Still, at minimum every new device should be CO/ALR rated. If you’re remodeling, pigtail as you go.

A 30-minute walkthrough tells us exactly what you’re dealing with and what the fix looks like. Reach out if you’re not sure what’s behind your walls.

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Frequently Asked Questions

Is aluminum wiring in my Pittsburgh home safe?

Solid aluminum branch wiring installed 1965 to 1975 is not inherently unsafe, but the connections at switches, outlets, and fixtures deteriorate faster than copper and cause the majority of aluminum-related fires. Every receptacle and switch in an aluminum-wired home should be inspected and either pigtailed or replaced with CO/ALR-rated devices.

What’s the difference between pigtailing and rewiring aluminum?

Pigtailing splices a short copper lead to the aluminum wire using a specialty connector (AlumiConn or COPALUM), then attaches the copper to the outlet or switch. Rewiring replaces the aluminum runs entirely with copper. Pigtailing is priced per device and costs far less than a full rewire.

Will insurance cover an aluminum-wired home?

Many carriers will underwrite aluminum-wired homes only if all devices have been professionally pigtailed with approved connectors (AlumiConn is the most widely accepted). A written electrician’s statement confirming the work often satisfies the carrier, we provide that letter with every aluminum remediation we do.

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Related Reading from Our Pittsburgh Electricians

• Why Your Lights Flicker When the AC or Dryer Kicks On (and Whether It’s a Problem)
• When Your Pittsburgh Home Needs a Sub-Panel: Additions, Finished Basements, and Detached Garages

Need a Licensed Pittsburgh Electrician?

Renaissance Electric & Power Systems has been serving Pittsburgh homeowners since 1997 with licensed, insured work backed by our PA contractor registration (PA-032900). Whether you need a panel upgrade, EV charger installation, recessed lighting, or whole-home surge protection, we handle it start-to-finish.

Call 1-888-681-WIRE (9473) or request a free estimate.

Service areas: Pittsburgh, Mt. Lebanon, Upper St. Clair, Bethel Park, Peters Township, Fox Chapel, Sewickley, Robinson Township, McCandless, Franklin Park, Hampton Township, O’Hara Township, Edgeworth, Sewickley Hills, and Bell Acres.