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    elherron's Avatar
    elherron Posts: 1, Reputation: 1
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    #1

    Aug 9, 2012, 07:24 PM
    Insulation over knob and tube?
    Can you spray cellulose insulation over knob and tube wiring in a attic
    smoothy's Avatar
    smoothy Posts: 25,492, Reputation: 2853
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    #2

    Aug 9, 2012, 07:42 PM
    No... when the humidity level goes up you could create a conductive path that could result in a fire due to old aged and possibly defective wiring. (cracked or damaged insulation)
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #3

    Aug 10, 2012, 02:47 AM
    Section 394.12 of the 2008 edition of the National Electric Code states:

    Uses Not Permitted
    (5) Hollow spaces of walls, ceilings, and attics where such spaces are insulated by loose, rolled, or foamed-inplace insulating material that envelops the conductors.

    The reason is that knob and tube wiring was designed to operate in open air. Any insulation covering K&T wiring will cause the wiring to overheat.
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