I have been trying to solve this problem but have failed.

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_...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

 

Frost means moisture. Are you sure you are not getting moisture from the bathroom vent? How do you know the answer to this question?

 

Hello
What you have is the north side never gets any sun to warm it enough to melt the ice..chanses are you are getting in on the other sides as well but it melts and does not build up so you can see it..Moisture in the attics can come from differant areas..If you have no vapore barier under the sheet rock it could be coming from the inside of the house..There are sever good paints you can use on the ceiling if this is where it is comeing form two coats of enamel will help...Some time the dryer vent goes up and out the vent if it is not taped tight it will let some moisture in.. check all exost vent pipes to see that they are all tight. Make sure there are no hole open like the attic access to let air in. make sure you have plenty of venting for the attic you may neet to add, so you get a good cross ventalation action to keep it dry..