On 6 Jan 2007 18:42:27 -0800, "m35603" wrote:

I posted a question last week or so about my neighbor's roof having a
wet spot on it. Two days ago, I took a few more pictures. It was below
feezing overnight and at 7:30 am the neighbor's roof looked like this:

http://i133.photobucket.com/albums/q...3/HPIM1605.jpg
http://i133.photobucket.com/albums/q...3/HPIM1604.jpg
http://i133.photobucket.com/albums/q...3/HPIM1603.jpg
http://i133.photobucket.com/albums/q...3/HPIM1602.jpg

What do y'all think?

The main suggestion under the other post were that it is caused by a
possible ventilation problem. The bathroom that is right there where
this spot is.

Thanks so much for everybody's input!
Angie

Frost forms when a surface cools to a temperature which is colder than
the dewpoint of the air next to the surface. The frosted area of the
roof must be cooler than the rest of the roof and has nothing to do
with moisture in the roof itself.