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  1. #1
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default "Sandwitched" Vapor Retarders In Attic Insulation

    Chicago climate, unconditioned attic, two layers of batt FG insulation - both installed with the vapor retarder toward conditioned space - and 6"-8" inches of blown-in FG insulation added above the batt insulation.

    Ductwork - but not furnace or air handler - is located in attic, no evidence of damage at ceilings below.

    Of course I'll report it and recommend correction.

    But I'm curious if has anyone has actually seen a problem as a result of this (as opposed to a reversed VR underfloor in crawl spaces, were I frequently see water damage as a result), and if so if you have a picture?

    Thanks.

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  2. #2
    A.D. Miller's Avatar
    A.D. Miller Guest

    Default Re: "Sandwitched" Vapor Retarders In Attic Insulation

    Quote Originally Posted by Michael Thomas View Post
    Chicago climate, unconditioned attic, two layers of batt FG insulation - both installed with the vapor retarder toward conditioned space - and 6"-8" inches of blown-in FG insulation added above the batt insulation.

    Ductwork - but not furnace or air handler - is located in attic, no evidence of damage at ceilings below.

    Of course I'll report it and recommend correction.

    But I'm curious if has anyone has actually seen a problem as a result of this (as opposed to a reversed VR underfloor in crawl spaces, were I frequently see water damage as a result), and if so if you have a picture?

    Thanks.
    MT: I have seen this often as well as folks who install faced batts atop blown-in material. I suggest (1) removal and replacement with unfaced or (2) using a razor knive to make multiple slices in the facing.


  3. #3
    Join Date
    Mar 2007
    Location
    Ridgewood, NJ
    Posts
    237

    Default Re: "Sandwitched" Vapor Retarders In Attic Insulation

    Nope, never seen a problem as a result installing insulation the way you describe.


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