Since most acoustical ceiling tiles are porous, they’re not waterproof. If you’re already struggling to keep your ceiling dry, you can imagine how that might be a problem. Aside from potentially creating the perfect breeding ground for mold and mildew, moisture can also stain the tiles.

Although they are resistant to humidity, acoustic ceiling tiles are not waterproof. As such, they’re susceptible to mold, fungi, and bacteria growth. Such growth can cause respiratory issues in humans, such as bronchitis, asthma, and sinus infections.