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Question DetailsAsked on 6/3/2011

Rewire before insulation?

Our house needs insulation badly, but has knob & tube wiring (1920 house). How important is rewiring before insulation?

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Very. Knob and tube wiring has a requirement that you must have 3 inches of clearance around the wires for ventilation. This doesn’t provide very much room for insulation. If you put the insulation too close to the wires they can overheat and cause a fire. It can be costly to replace all of the wiring – depending on the size of the attic it can run from $500 to $2,000. It is the most expensive type of wiring repair, but it is really important to find a skilled electrician. Since it is older wiring, not everyone knows how to replace it.

Answered 7 years ago by Angie's List




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