I live in Québec,Canada and I have a condo. The condo is 2 story high and I have an attic. Since 2-3 years, I have frost in my attic. The roof is brand new from last spring (2013) and they have put new ventilation like this one (http://www.renodepot.com/fr/ventilateur-de-toit-6467005).
Soffit are clear with no debri and no insulation blocking them.
This year, I decided to try to fix things in attic since new roof/ventilation didnt helped with frost. I found some issues like big hole in vapor barrier and other stuff that I fixed with vapor barrier and tuck tape, I also insulated properly the attic access (it’s not stairs access).
How can I know if I did a good job ? Should I see no more frost in attic ? I can see that there’s less frost but there’s still some. Do I need to wait until the next winter to be sure ? (I did the fix like 2 weeks ago)
I did a visual inspection of the attic and I found mold at 3 places only (small spot) that I washed with soap/bleach/water