Insulation question.?

Sep 14

I own an older home with no insulation. The walls are 4 in deep, but R-15 insulation is only 3 1/2" thick. It does say, on the packaging, it is made for 2X4 construction, but should I put 1/2" Rigid FoamFoam Insulation in addition to the fiberglass batts to make up the difference?

No because if you compress the insulation you will lower the effective R value. The 4" insulation will fluff out to fill the void.

Mike

Can rigid foam insulation be installed in basements underneath or before strapping?

Filed under: Rigid Foam Insulation

3 Responses to “Insulation question.?”

  1. dusty_titus, on September 14th, 2009 at 3:33 pm Said:

    You could, but my understanding is that the gap is necessary for air movement. I insulated my garage with foam from meat packaging and covered with drywall. It seems to help.
    References :

  2. chicagirl51, on September 14th, 2009 at 3:56 pm Said:

    2×4′s will accept the insulation. You don’t want the insulation to compress so you will be fine without the rigid foam.
    References :

  3. Beer and TV Olympian, on September 14th, 2009 at 4:11 pm Said:

    No because if you compress the insulation you will lower the effective R value. The 4" insulation will fluff out to fill the void.

    Mike
    References :

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