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  1. #1
    Join Date
    Jan 2014
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    4

    Default How can I insulate over plaster walls without demo

    I would like to either place rigid insulation over the entire exterior walls or frame a wall in front of the plaster wall and use batt insulation. This is our shore house and I do not want any issues with mold or moisture. Any suggestions being economical and safe?

  2. #2
    Join Date
    Dec 2010
    Location
    Houston Texas
    Posts
    2,969

    Default Re: How can I insulate over plaster walls without demo

    IS this space above ground? Below?

    Interior ? Exterior?

    Heated ? Cooled ?

    Vented ?

  3. #3
    Join Date
    Jan 2014
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    4

    Default Re: How can I insulate over plaster walls without demo

    This is for the interior side of the exterior walls. The spaces are heated and cooled.

  4. #4
    Join Date
    Sep 2012
    Location
    Boston
    Posts
    1,004

    Default Re: How can I insulate over plaster walls without demo

    there's a list a mile long in a previous post that addresses this issue and why you should not do what you're thinking about doing.

  5. #5
    Join Date
    Jan 2014
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    4

    Default Re: How can I insulate over plaster walls without demo

    Thank you I will look for it.

  6. #6
    Join Date
    Jan 2014
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    4

    Default Re: How can I insulate over plaster walls without demo

    I'm new to this site and see there are a lot of threads is there an easy was to search or do you know where the thread is.

  7. #7
    Join Date
    Sep 2012
    Location
    Boston
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    1,004

    Default Re: How can I insulate over plaster walls without demo


  8. #8
    Join Date
    Dec 2013
    Location
    New Hampshire
    Posts
    27

    Default Re: How can I insulate over plaster walls without demo

    If your existing wall is already has blown in insulation adding insulation to the inside whether foam board or fibrous between studs is rarely economical for the a previously stated reasons, But leaving the old plaster in place is unlikely to cause any mold or moisture problems. For much of the country having an air barrier and vapor retarder in the center of the wall assembly with insulation to both the interior and exterior is very good for preventing mold and moisture problems. Adding additional insulation to the inside could however cause problems in cool climates if there is already insulated sheathing on the exterior with a low perm facing.

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