Can knob-and-tube wiring ever be buried under attic/wall insulation with inspection sign-off, or must it be replaced or isolated to remain code-compliant and insurable?
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Do not ever bury any live wire, knob and tube, UNDER INSULATION!
This is very explicit as that can be an obvious FIRE hazard.
replace, de-energise, isolate, remove completely.
Hey, just a heads-up: don’t bury knob-and-tube wiring under insulation—it’s a fire risk! This type of old wiring needs to breathe to keep cool. If you cover it with insulation, it can trap heat and cause the wires to overheat.
Most electrical codes, like the U.S. National Electrical Code (NEC), say you can’t cover knob-and-tube wiring with insulation. Home inspectors usually won’t approve it, and many insurance companies won’t cover houses with this kind of active wiring unless it’s removed, replaced, or turned off the correct way.
If you’ve got knob-and-tube in your house, the safest bet is to replace it with modern wiring. That way, you’ll be safe, up to code, and your home will be insurable!
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Knob-and-tube (K&T) wiring cannot be buried under insulation and still remain code-compliant or insurable in most jurisdictions.
Here’s why:
The National Electrical Code (NEC) prohibits covering K&T wiring with insulation (NEC 394.12), due to overheating risks It was designed to dissipate heat into open air.
Most inspectors will not sign off on installations where K&T is covered, unless it has been de-energized or fully replaced.
Many insurance companies will not insure homes with active K&T, especially if buried, due to fire risks.
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Knob-and-tube wiring can be a concern when it comes to insulation in attics and walls. Here’s what you need to know:
Safety Concerns
Knob-and-tube wiring was designed to remain visible, allowing for heat dissipation and reducing the risk of electrical fires. Buried wiring under insulation can lead to heat buildup, increasing the risk of fires. It’s crucial to have a qualified electrician inspect your wiring before adding insulation.
Inspection and Code Compliance
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Inspection: A licensed electrician or home inspector should evaluate the condition of your knob-and-tube wiring to determine if it’s safe to insulate over.
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Code Compliance: Local building codes may prohibit insulating over knob-and-tube wiring. Check with your local electrical inspector to ensure compliance.