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There is a basement behind the cinder block wall. One half of the basement is a heated, finished space. It is insulated on the inside with rigid poylstyrene board between the cinder block and the 2x4 framing. The top of the foundation is covered with fiberglass bats, but no vapor barrier. This is where I'm thinking of adding rigid poylstyrene board to the outside of the foundation.
The other half of the basement is an unfinished, unheated double garage with no insulation on the inside. There is below grade rigid poylstyrene on the outside against the cinder block, but I don't know if it goes down as far as the footing. This is where I'm thinking of adding rigid poylstyrene board to the inside of the cinder block and turning the garage into an insulated, heated space. The wall between the garage and the rest of the basement is insulated.
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