Moisture-Resistant Drywall: Preventing Mold in Humid Homes

What Is Moisture-Resistant Drywall?

Moisture-resistant drywall — commonly called green board because it's faced with green paper — is designed for areas with high humidity levels. The facing has a wax-based coating that repels water better than standard drywall paper. The gypsum core is also slightly more resistant to moisture absorption. Green board is not waterproof, but it handles the sustained humidity of a bathroom or kitchen far better than regular drywall.

Where to Use Green Board in Your Home

• Bathroom walls and ceilings around tubs and showers (behind tile backer board)
• Kitchen backsplash walls and areas near the sink
• Laundry room walls with poor ventilation
• Basement walls where moisture seepage is a concern
• Garage walls attached to the house — particularly important for temperature-buffer zones

Green Board vs. Cement Board for Showers

Important: green board should not be used as the direct surface behind shower and tub tiles. For wet areas that see regular standing water, cement backer board is the correct material. Green board works on the walls surrounding the wet zone — above tile, adjacent walls — but not inside the shower enclosure itself. Mixing this up is a common mistake for DIY tiling projects.

Mold Prevention Beyond the Board

Moisture-resistant drywall alone won't prevent mold if you don't manage humidity. Use exhaust fans in bathrooms, consider a whole-house dehumidifier if your home runs humid during Bakersfield's monsoon season, and fix any plumbing leaks quickly. Mold spreads fast when it finds a damp wall cavity. Bakersfield Elite Drywall handles mold remediation, green board installation, and full bathroom drywall replacements throughout Kern County.