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