Is hard-cell foam better because it is a better vapor barrier?
Some builders think hard-cell is better because it does not allow water to get through. No one wants water getting into the house, and no one plans to have the roof leak. But if some moisture gets through the roof, we’d rather have open cell insulation to allow it to dry. If there is a big leak, we’d rather have the water come through the insulation so that we know where the leak is rather than having it trapped above the insulation and rotting out the roof or running to another part of the house. So we prefer open cell for the same reasons some people prefer closed cell.
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