Maintenance
First cold morning of the season and there’s a wet spot on the ceiling, or water beaded up on the nails in your attic. Most of the time, that’s not a roof leak — it’s condensation. Warm, moist air from inside the house rises into a cooler attic, hits cold decking or metal, and turns right into water, same as a cold glass sweating on a humid day.
The real fix is usually airflow, not shingles: blocked soffit vents, a bathroom fan dumping into the attic instead of outside, or not enough ridge vent for the attic’s size. Tarping it or caulking around nails just traps the moisture and rots the decking underneath instead of fixing anything.
A slow roof leak can look identical to condensation, especially near flashing or old nail holes — don’t guess which one you’ve got, get it checked before it does real damage.