Why aluminum wiring is an issue at all
Aluminum was used widely for branch circuit wiring for about a decade, and there is nothing inherently wrong with the conductor itself — utilities still run aluminum for service entrance conductors today. The problem is at the connections. Aluminum expands and contracts more than copper as it heats and cools, it is softer, and it forms an oxide layer that resists current. Over decades of daily cycling, terminations at outlets, switches and light fixtures can loosen and heat up.
That is the whole issue: the ends, not the middle. And the ends are fixable.
What insurers actually want
Most Alberta carriers will insure a home with aluminum branch wiring, but only if it has been remediated by a licensed electrician and there is documentation to prove it. A few will not touch it at all. If you have had a renewal declined or conditioned, this is almost always the reason and almost always the fix.
How we remediate it
The accepted method is pigtailing: a short copper "tail" is joined to the existing aluminum conductor with a connector specifically listed for aluminum-to-copper connections, and the device is then landed on the copper. The aluminum stays in the wall, where it was never the problem. Every device that touches it gets a proper, listed termination.
- Every device, not a sample. Receptacles, switches, light fixtures, smoke alarms, junction boxes — anywhere aluminum lands on a terminal.
- Approved connectors only. Connectors listed for aluminum-to-copper, installed with the correct compound and torqued to the manufacturer's spec. Not wire nuts, not a twist and tape.
- Box fill checked. Adding pigtails adds volume. Undersized boxes get extended or replaced rather than crammed.
- Devices replaced as needed. Anything scorched, brittle or backstabbed gets changed out.
- Permitted and inspected, so you finish with a document, not just a verbal assurance.
Two shortcuts to refuse. Standard wire nuts on aluminum-to-copper are not an approved connection, and "we'll just do the outlets you use most" is not a remediation. Both leave you with the same risk and no paperwork your insurer will accept. If someone quotes you either one, the price difference is not a bargain.
What it's like to live through
Pigtailing is methodical work — the cost is in the number of devices, not in difficulty. We work room by room so the whole house is never dead at once, and we put covers back and clean up as we go. Most homes are a one to two day job. We keep a running count of devices completed so you can see exactly what was touched, and you get that list at the end.
Buying or selling a house with aluminum wiring?
If you are buying, get it inspected and get a real number before possession — it is a negotiable item and a known quantity, not a mystery. If you are selling, a completed remediation with paperwork removes an objection that otherwise sits on the table for the entire deal. We are happy to walk a property at the offer stage and give you a figure you can act on.
Frequently asked
Almost never. Full rewiring is expensive, invasive and, for aluminum branch circuits in sound condition, usually unnecessary. Pigtailing at every termination addresses the actual failure point and is the accepted remediation. If we find conductors that are genuinely damaged, we'll show you and explain the options — but we do not lead with the biggest job.
Homes built roughly 1965–1978 are the window. The cable jacket is often stamped ALUMINUM or AL, and the conductor is silver rather than copper-coloured. Do not pull devices out yourself to check — call and we will look.
In our experience yes, when it is done at every device with listed connectors, permitted and inspected. You will have the permit and the inspection to send them. If your carrier has specific requirements, share them at the quote stage.
Yes. We work room by room and restore power as we go. You will lose power to the area we are in, not the whole house for two days.