How bad is it to have wet insulation

atticinsulationleak

With this recent blizzard we recently saw our ceiling lighting fixture leaking water (slow, about 1 drop every 5 minutes)

I got up in the attic and saw that some snow had been apparently blown into the attic through one of the vents. I removed about 2 handfuls of snow from on top of the insulation, but 2 of the pieces were still damp. Should I remove them? Or will they dry up soon enough? Are there any problems with that?

Also, should I do something to seal up the electrical box from the attic?

Best Answer

If your insulation is damp, chances are good it could freeze or stay damp for a while. If not too much is involved, it would be a good idea to remove it to a warm place to dry out, or simply replace it. Never a good idea to leave wet material against ceiling drywall. It could dampen and ruin the drywall. If left too long, mold or mildew could result. The snow coming through the vents is probably an isolated event. Don't close the vent. Maybe just lay a sheet of 4 mil plastic over the insulation to keep snow off your insulation. Keep an eye on it. If it happens often, consider a better louvered/screened vent fixture that won't allow snow to blow in as easily.