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  1. #1
    Join Date
    Feb 2008
    Posts
    4

    Default 3.5" insulation in a 4" wall?

    I'm planning on replacing the 1" seaweed insulation in my 1950's home with a more modern alternative. The most common (and least expensive?) option seems to be using some R12 pink fibreglass insulation. But I notice that it indicates that it is for 3.5" spaces. I believe that because my house is from the 50's it is using actual 2x4's, so does this mean that the insulation will actually be slightly to small for a retrofit application?

    (I realize that it will fit in just fine, but I've been told that the slightest air gap with insulation will destroy the R Value...)

  2. #2
    Join Date
    Feb 2008
    Posts
    4

    Default Re: 3.5" insulation in a 4" wall?

    It is very useful to validate my concerns.

    Another option would be to use a 1/2 inch piece of expanded foam and then the R12 3.5 inch fibreglass?

    -Joe

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