The odd thing about my situation is that the problem only occurs on the
north side?

Please check out the pictures and let me know if you have any ideas
http://www.ultranet.com/~dmad/frost_inside_the_attic_roof.htm

Thanks

Addition info

Attic floor insulation consists of about 4" loose and then normal unfaced bats....

2 * 6 joists 1 * 3 strapping then the drywall of the ceiling below.

The attic has a gable vent at the peak at each end. Last winter I installed sofit vents on the north side. (the house did not have any originally)

I ducttaped and insulated a bath room vent the was ducted to the attic (we had never used this but it was open until this year.

HELP.......

David Maddalena
Boston, MA