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Understanding Aluminum Wiring in Your Home: Risks and Solutions

Updated: Jan 18

Learn about the risks of aluminum wiring in homes and explore safe solutions with NexGen Home Inspections. Protect your home from potential fire hazards.

Welcome back to the NexGen Home Inspections blog! Today, we’re shedding light on a critical topic for homeowners, especially those in houses built between 1965 and 1973: Aluminum Wiring. Understanding the risks and solutions associated with aluminum wiring is crucial for ensuring your home's safety and integrity.

The Era of Aluminum Wiring

Between 1965 and 1973, due to the soaring costs of copper, aluminum wiring became a popular alternative for residential electrical systems in the United States. However, this trend was short-lived as the drawbacks of aluminum as an electrical conductor became evident.

Why Aluminum Wiring Raises Concerns

Aluminum wiring is prone to several problems that can pose significant safety risks:

  • Higher Electrical Resistance: Aluminum has greater resistance to electrical current than copper, requiring larger diameter wires for the same current load.

  • Less Ductility: Unlike copper, aluminum is less tolerant to bending and manipulation, leading to internal breakdowns and heat buildup.

  • Galvanic Corrosion: When aluminum comes into contact with certain metals in the presence of moisture, it undergoes galvanic corrosion.

  • Oxidation: Aluminum oxidizes quicker than copper, and the resulting aluminum oxide is less conductive, posing a fire hazard over time.

  • Malleability and Thermal Expansion: Aluminum is more susceptible to deformation under pressure and reacts more to temperature changes, weakening connections.

Recognizing Aluminum Wiring

Home Aluminum Wiring, Safety, Electrical Wiring, Fire H
Aluminum Wiring

Identifying aluminum wiring is straightforward:

  • Look for aluminum color or markings such as "AL" or "aluminum" on the wire jacket.

  • Wiring devices compatible with aluminum are marked CO/ALR (copper/aluminum revised).

  • Homes built or remodeled between 1965 and 1973 are more likely to have aluminum wiring.

Addressing the Risks: Safe Solutions

It's crucial to consult a qualified electrician experienced in dealing with aluminum wiring issues. The Consumer Product Safety Commission (CPSC) recommends:

  1. Complete Rewiring with Copper: This is the most effective, albeit expensive, solution.

  2. Use of Copalum Crimps: A specialized method involving copper wire attached to the aluminum circuit.

Other methods, not recommended by the CPSC as permanent solutions, include:

  • Anti-oxidant paste application for multi-stranded or large wires.

  • CO/ALR connections, though not a comprehensive solution.

  • Alumiconn connectors, a newer method with limited history.

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NexGen Home Inspections’ Role

As part of our commitment to your home's safety, NexGen Home Inspections adheres to the InterNACHI Home Inspection Standards of Practice. This includes reporting single-strand, solid conductor aluminum branch-circuit wiring if observed during an inspection.


Aluminum wiring in homes, due to its inherent properties, can be a significant fire hazard. Understanding these risks and seeking professional assessment and solutions are essential steps in ensuring the safety of your home. Stay informed, stay safe, and remember, NexGen Home Inspections is here to help with all your home inspection needs.

Stay tuned to our blog for more valuable insights into home safety and maintenance.

Home Aluminum Wiring, Safety, Electrical Wiring, Fire Hazards

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