First time home owner of 1 year old house in Southern Ontario.
South facing basement wall (50% above grade) has condensation forming between polyethylene barrier and pink batt insulation.
What could be a common cause of this?
Basement – Causes of condensation in basement wall
basementinsulationmold
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Best Answer
It's the combination of polyethylene and fiberglass batt insulation. What you have there is a mold-and-rot-machine. For more info, see http://www.buildingscience.com/documents/digests/bsd-103-understanding-basements/
You need to remove the poly sheeting at a minimum. Preferably, you would redo the basement wall entirely to have rigid foam insulation against the concrete walls and spray foam in the stud bays of the aboveground part.