Use moisture or mold resistant drywall behind a kitchen sink.
Drywall, also called wallboard or sheet rock, is an inexpensive, lightweight wall covering used on walls and ceilings and is an excellent choice for new kitchens or to replace plaster or other wall covering in older ones. However, you must use the right type and thickness of sheet rock. Very thin or non-waterproof types may not perform well in the hot, humid environment of most kitchens. Knowing which types of drywall work best in kitchen installations can help homeowners choose the right materials for their remodel or new home.
Standard
Standard drywall is available in 1/4-, 3/8-, 1/2- and 5/8 inch thicknesses. It works well for areas of the kitchen that are unlikely to be exposed to much moisture, such as a separate pantry. Choose thinner sheet rock for ceilings and thicker panels for walls, especially to reduce sound travel. Special tapered-edge sheets are available to make ceiling installations simpler. Do not install regular drywall in wet areas. It's made only of paper and gypsum and will deteriorate when exposed to moisture.
Mold Resistant
Kitchens are often warm, humid environments, especially near the back of the refrigerator, over the stove and in similar areas. Moisture can build up in drywall on both walls and ceilings, creating the perfect environment for mold and mildew growth. Mold-resistant drywall is sold as "mold board" or simply listed as mold proof. According to Home Depot, mold board comes only in 1/2- and 5/8-inch thicknesses and has a special coating to prevent unsightly and unhealthy mold growth.
Moisture Resistant
Moisture resistant sheet rock works well in wet areas, such as near the kitchen sink. Install it in parts of the kitchen that aren't normally wet but that might occasionally suffer from spills too. This board has a special surface coating that helps it prevent moisture from sinking in and is often called backer board or greenboard. While moisture-resistant sheet rock won't withstand regular soaking, it can help maintain a smooth, attractive wall. One-half inch is the most common thickness for moisture-resistant drywall, which needs to maintain its shape even when damp.
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