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  1. #1
    Join Date
    Jan 2010
    Posts
    1

    Default Old house wall insulation

    My house was built in the 20's. It's a double brick with the original plaster walls on the inside. I believe that there is no insulation. What would be the most effective way to insulate?

  2. #2
    Join Date
    Dec 2009
    Location
    Casper, Wyoming
    Posts
    159

    Default Re: Old house wall insulation

    This chart will help you: http://www.energysavers.gov/your_hom.../mytopic=11510.

    It sound like loose-fill, blown in insulation is a good option.
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  3. #3
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Old house wall insulation

    Quote Originally Posted by vesnas@sympatico.ca View Post
    My house was built in the 20's. It's a double brick with the original plaster walls on the inside. I believe that there is no insulation. What would be the most effective way to insulate?
    Not enough information to provide a detailed answer.
    I suspect this in Southern Ontario?

    Is there any space between the plaster wall and the brick?

    Is there old and original knob & tube wiring?

    The less destructive and quickest method that would provide a good result would be to apply rigid foam over the plaster walls and cover with drywall.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  4. #4
    Join Date
    Aug 2009
    Posts
    62

    Default Re: Old house wall insulation

    Rigid foam over plaster and then drywall would be my vote as well. Simple lose fill through the plaster invites problems with the electrical depending on how it was done (exposed junctions/splices, etc) and issues with vapor condensation on the insulation.

    The more effective way (and most expensive) would be to remove the plaster walls leaving the framing, put in insulative batts or spray foam and then a vapor barrier putting up drywall over it.

  5. #5
    Join Date
    Feb 2010
    Location
    Eastern MA
    Posts
    75

    Default Re: Old house wall insulation

    Consider rigid foam on the exterior with astucco finish. The thermal mass on the inside will help temper temperature swings and you don't give up interior space. A lot easier to live with the construction while happening outside than with tearing up the insides.

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