Finding frost in your attic after a cold snap? You’re not alone. Homeowners often discover it when temperatures rise and frost turns into ceiling stains, dripping light fixtures, wet insulation, or mold growth. The good news: this isn’t a roofing issue—it’s a moisture and air leakage problem. Why Frost Builds Up in Attics Frost forms when warm, moist indoor air leaks into the attic  and hits cold surfaces like nails or roof sheathing. The frost itself isn’t harmful, but once