Why Aluminum Wiring Is Dangerous
The U.S. Consumer Product Safety Commission (CPSC) found that homes wired with aluminum between 1965-1973 are 55 times more likely to have fire hazard conditions than homes with copper wiring.
Oxidation
Aluminum oxidizes when exposed to air, creating high-resistance connections that generate heat.
Expansion
Aluminum expands 30% more than copper when heated, loosening connections over time.
Galvanic Corrosion
Direct aluminum-to-copper connections corrode, increasing resistance and heat generation.
CPSC-Approved Remediation Methods
COPALUM Crimping
Gold standard method. Creates cold-welded connection between aluminum and copper pigtail. Requires specialized training and tools.
AlumiConn Connectors
Set-screw connector with anti-oxidant compound. Can be installed by any licensed electrician. Widely available.
Complete Rewiring
Replace all aluminum branch wiring with copper. Most thorough option, typically done during major renovations.
Methods NOT Recommended
CO/ALR Devices
Once considered acceptable, now NOT recommended by CPSC. Connections can still fail.
Wire Nuts with Anti-Oxidant
Not an approved permanent repair. Connections loosen over time.
Push-In Connectors
Standard push-in connections are especially dangerous with aluminum wire.
Insurance & Real Estate Implications
Many Wisconsin insurance companies have strict requirements for homes with aluminum wiring:
- Some insurers refuse coverage for unremediated aluminum wiring
- Premiums may be 25-50% higher without remediation documentation
- Fire claims may be denied if aluminum wiring was a factor
- Home inspections flag aluminum wiring, potentially complicating sales
Good news: Documentation of CPSC-approved remediation typically satisfies insurance requirements and protects resale value.
Don't Wait for Warning Signs
If your home was built between 1965-1978, schedule a safety inspection. Couillard Electric provides aluminum wiring assessments and CPSC-approved remediation throughout Sheboygan, Ozaukee, and Washington Counties.