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Good To Be Green'sGuide To Green Home Building
While exterior doors should be as tight as possible, it sometimes makes sense to purposely allow air flow under interior doors. Proper air flow helps in the distribution of fresh air as part of a home ventilation system. Undercutting the doors by 3/4 inch or so allows fresh air to circulate throughout spaces even when doors are closed.
These lightweight doors are often made from honeycomb cores.
Naturally rot-resistant woods make good alternatives to wood treated with toxic preservatives.