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  1. #1
    Jon mackay's Avatar
    Jon mackay Guest

    Default Wiring over fiberglass insulation

    This is the first time I have come across this.

    The wiring was installed over the insulation at many areas of the attic and was also pulled tight at a couple other areas.

    I was looking for a reference to see how to report this..

    Thank you

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  2. #2
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: Wiring over fiberglass insulation

    Quote Originally Posted by Jon mackay View Post
    This is the first time I have come across this.

    The wiring was installed over the insulation at many areas of the attic and was also pulled tight at a couple other areas.

    I was looking for a reference to see how to report this..

    Thank you
    Outside of a reduction in the R value due to the compression of the batts, I do not really see it as an issue. Now if the NM cable is so taut that it is pulling and might be damaged by something like nails or staples that are securing it then you have another problem. I think I would note exactly what you found and tell my client that it the R value has been reduced by an known amount. I would then tell them that I really have no idea if this is going to be a problem or not as I have never seen it done like this.

    It never hurts to say "I don't know" if in fact you really do not know!

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

  3. #3
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,248

    Default Re: Wiring over fiberglass insulation

    While that NM cable may be "supported", it is not "secured": (underlining and bold are mine)
    - 334.30 Securing and Supporting.
    - - Nonmetallic-sheathed cable shall be supported and secured by staples, cable ties, straps, hangers, or similar fittings designed and installed so as not to damage the cable, at intervals not exceeding 1.4 m (4 ft) and within 300 mm (12 in.) of every outlet box, junction box, cabinet, or fitting. Flat cables shall not be stapled on edge.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  4. #4
    Jon mackay's Avatar
    Jon mackay Guest

    Default Re: Wiring over fiberglass insulation

    Thank you Jerry and Scott,

    The wiring may be secured but I can't believe that it would be an acceptable installation just strapped over the insulation like that.

    Also there were 2 attic hatches and one of them (which is needed due to a vaulted ceiling at the middle of the attic) was obstructed by something above, I would guess wiring.

    It certainly begs the question of how they could have installed other wiring in the house if they had no problem wiring over the insulation and an access hatch.


  5. #5
    Join Date
    Apr 2010
    Location
    Connecticut
    Posts
    49

    Default Re: Wiring over fiberglass insulation

    The wiring appears to be installed unprofessionally (DIY).
    The entire electrical system should be evaluated by a licensed electrician.


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