How to Stop Mildew on Drywall Ceiling of New Garage


Mildew is a fungi that grows on the surfaces, including drywall ceilings. Mildew causes discoloration, deterioration and odor problems and may lead to serious allergic reactions. In order for mildew to grow, there must be sufficient moisture. Consequently, the most effective way to stop mildew from overtaking the drywall ceiling in your new garage is to prevent moisture buildup.

Things You'll Need

  • Dehumidifier
  • Fan
  • Chemical absorbent
  • Cleaning solution
  • Stiff brush
  • Run a dehumidifier in the garage. Dehumidifiers are designed to mechanically remove moisture from the air. The Environmental Protection Agency recommends using a dehumidifier to keep your relative humidity between 30 and 50 percent to avoid mildew growth. Many dehumidifiers include a feature that measures relative humidity.

  • Circulate the air, which is essential to remove excess moisture from the air. Open windows in your new garage and run an electric fan. Alternatively, you can install an exhaust fan.

  • Place bags of silica gel, activated alumina or anhydrous calcium sulfate in your new garage. These chemicals, available at most home supply stores, pull moisture out of the air and away from the drywall ceiling. Keep these chemicals away from children and pets.

  • Spray the ceiling with a mildew cleaning solution and scrub the ceiling with a stiff brush if mildew has already appeared on the ceiling.

  • Replace the drywall ceiling. According to the North Dakota Extension Service, mold can be almost impossible to remove from drywall. Thus, if the mold has gotten out of hand, consider replacing the drywall ceiling.

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