attic condensation 21

https://waterstainceilinglab.opalvector.com/posts/what-that-water-stain-on-your-ceiling-really-means

You walk into the attic on a cold morning and notice the ceiling beams are dripping, the insulation feels damp, and there's a musty smell hanging in the air. That's attic condensation—warm, moist air from the living spaces below rises up, hits the cold roof surface, and turns back into water droplets. Over time, it can soak into the wood, stain the sheathing, and even grow mold. It usually happens when there's not enough ventilation or airflow up there, so the trapped moisture has nowhere to go…