How do you insulate a crawlspace?

Drew Weistend Published: Nov. 14, 2017, 9:22 a.m.Last updated: Nov. 30, 2019, 7:38 p.m.

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. 

Responses (1)