The Wiring Behind Your Walls May Be Nearly 100 Years Old
If you live in a Chicago bungalow, greystone, two-flat, or vintage home built before 1950, there's a significant chance dangerous knob-and-tube wiring is still running inside your walls. Insurance companies won't cover homes with active K&T wiring.
What Is Knob-and-Tube Wiring?
Knob-and-tube wiring is an early electrical system using insulated copper conductors run individually through walls, ceramic knobs for support, ceramic tubes through structural members, and no ground wire. It was common in homes built 1880–1950.
Why It's Dangerous Today
K&T wiring has no ground wire for fault protection, uses degraded insulation after decades, cannot handle modern electrical loads, and creates fire risks when insulation is blown over the wires in attics. Many Chicago homes from the 1920s–1940s have miles of it hidden in walls.
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