The Hidden Danger of Old Aluminum Wiring in Homes

If your home was built or renovated between the mid-1960s and late 1970s, there’s a chance it contains old aluminum wiring — and that could put your safety at risk.

Why Was Aluminum Wiring Used?

During the 1960s, the price of copper soared, leading many builders to turn to aluminum as a cheaper alternative for residential electrical wiring. At the time, it seemed like a reasonable solution. But over the years, aluminum wiring has proven to be far less reliable and potentially hazardous.

The Risks of Old Aluminum Wiring

Aluminum is softer and expands more than copper, which can cause several serious problems:

• Loose connections: As aluminum expands and contracts, it can loosen at terminals, increasing resistance and heat.

• Overheating and fire risk: Loose or degraded connections can cause overheating, a significant fire hazard.

• Corrosion: Aluminum oxidizes more easily than copper, and this corrosion can interfere with electrical flow.

• Incompatibility with modern devices: Many modern outlets, switches, and fixtures aren’t rated for aluminum, increasing the risk of unsafe connections using old aluminum wiring.

According to the U.S. Consumer Product Safety Commission (CPSC), homes with old aluminum wiring are 55 times more likely to have fire hazard conditions than those with copper wiring.

What Should Homeowners Do About Old Aluminum Wiring?

If you suspect your home has aluminum wiring, here’s what to do:

1. Have a licensed electrician inspect it—they’ll confirm whether you have aluminum wiring and assess its condition.

2. Don’t DIY — Avoid making your own repairs. Improper handling of old aluminum wiring can make the situation worse.

3. Consider safe solutions:

   • COPALUM crimp connectors: A permanent, CPSC-recommended solution installed by a certified technician.

   • AlumiConn connectors: A less expensive but still approved fix for specific conditions.

   • Rewiring: In some cases, complete replacement with copper wiring may be the best long-term option.

Final Thoughts On Old Aluminum Wiring

Old aluminum wiring isn’t always an immediate danger, but it should not be ignored. If your home is more than 40 years old, especially from the 1965–1975 era, an inspection is a smart move. Staying proactive can help prevent serious electrical problems — or worse, a house fire.

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Tru Craft Admin Master Electrician

Meet John Kostoff, Master Electrician and founder of Tru-Craft Electric. When John and his wife, Mary, moved from Buffalo to Colorado back in 1979, they set out not just to build a business but to create a community-focused electrical service grounded in honesty, hard work, and respect. Over the last four decades plus, John has upheld that promise: doing things right, charging fairly, treating every customer like a neighbor, and showing up on time. Today, John’s legacy is carried forward by his two sons—Peter, also a Master Electrician, and Tim, soon-to-be journeyman—while Mary keeps the engine of the business humming from the accounting side. From offering free electrical inspections after the Marshall Fire to helping rebuild safe, reliable systems, John and the team have never shied away from rolling up their sleeves when the community needed them. With Tru-Craft Electric, you’re not just hiring an electrician; you’re gaining a trusted local partner who understands your home, your needs, and the importance of doing the job right.

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