Gntry wrote:

I live in western NY and the weather here for the last week or so has been
around low 30"s, I was in the attic the other day and the nails coming
through the roof are dripping water....I have a full ridge vent, full soffit
on the west side of the house(and they aren't blocked by any insulation),
and gable vents. It is definately cold in the attic and there is about R25
on floor w/ barrier down towards living space, the roof was replaced about
10 yrs ago....what is causing this and should I be concerned?


I think you need to quantify "cold in the attic." Put a thermometer
up there. It could be pretty cold and still be warm enough for the
nails to be a lot colder. Everything's relative when you're talking
about relative humidity. :-)

In fact, you could probably also directly measure the humidity up there
with a cheap hygrometer (although I don't know how good they are at cold
temps).

Is your furnace in the attic, by any chance?

Could there be gaps in that moisture barrier, perhaps around light
fixtures, vent pipes, etc., that are leaking enough conditioned air
to carry the moisture you're seeing?

Can you discern whether some are dripping more than others? The worst
offenders might be nearest the source of moisture.

I would be concerned, particularly because of the possibility of mold
developing.

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