I live in Northern Ontario in a house converted from a cottage, it has a 20 'X 20' crawlspace with floor joists at about 24" on center. I put 6 mm polythene on the ground and put fiberglass insulation between the joists. Since then I have noticed a lot of condensation and mold forming on the insulation despite the crawlspace being ventilated with hatch doors. What have I missed? We have a water heater but no furnace, so its stays pretty cold.
What's the best way to seal a crawl space and insulate?
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