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sourcesmith | 6 years ago

What plastic box would that be?

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Gibbon1|6 years ago

All the closed cell plastic foam needed to meat passive house requirements.

A point. All the energy savings disappear the moment you open a window.

sourcesmith|6 years ago

I think this has already been addressed by the sibling comment to my question. Insulation does not have to impermeable. Its purpose to prevent the loss of air carrying heat with it, not the transfer of moisture/humidity.