Air leakage or just interior humidity / stale air?
I have a 1930s home in Sudbury, 4 hours north of Toronto, Ontario. Temperatures get down to -40 degrees C in the winter here. The home is an old log home. 2 years ago, I installed 3" polyiso on the exterior of the house, and replaced the windows with Fibertec, triple glazed windows, high SHGC on south face, mid-low on remaining orientations. I also chose fixed windows for better peformance on north and south walls, as prevailing winds are east-west.
For the window detail, I went with the large interior sills (9-10") instead of moving the windows towards the inside of the wall and keeping them better protected for exterior winds... I think this is my problem.
Starting in September, if I'm not running my HRV 24 hours a day, I get some condensation on the bottom of the windows. Maybe I should be running my HRV 24 hours a day, but I've been using it mainly to keep my interior RH down - usually run it 30-40% of the time.
I have caulked the interior and exterior of the windows, so I can't imagine how air leakage is a problem, but I'm wondering if there is a possiblilty that the windows have a problem...
Is there a homeowner test I can do to check for leaky frames?
Posted Dec 9, 2010 12:57 PM ET
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