Moisture-resistant drywall goes by many names: green board, blue board, backer board, MR (moisture-resistant) or WR (water-resistant). Despite the variety of labels, this type of drywall does one main thing -- it resists moisture. However, it is not waterproof. Moisture-resistant drywall withstands high levels of humidity without warping or staining. In communities that receive high amounts of rainfall, local code may specify the installation of moisture-resistant drywall in some parts of the house. If not, your bathroom may still benefit from this durable type of wallboard.
Panel Features
Moisture-resistant drywall is denser than regular drywall, and you may find that you need to cut it with a fine-tooth saw instead of a utility knife. The paper facing on the front side of the panel is thicker than standard drywall paper facing and infused with materials that repel moisture. In addition to offering protection from moisture, this type of drywall may be used as a backer for the installation of some types of ceramic tile.
Benefits and Uses
In bathroom areas subject to heavy humidity or occasional water spray, moisture-resistant drywall is essential. Over the shower and tub and behind the sink are standard spots for installing moisture-resistant drywall. Since its more expensive than regular drywall, some homeowners request MR drywall only in these specific areas. If the bathroom is not properly ventilated with an exhaust fan or a window that opens to the outdoors, consider installing moisture-resistant drywall throughout the entire room.
Basement Bathrooms
Below-grade bathrooms are subject to higher levels of humidity, often due to the reduced air circulation in basements. In addition, during periods of high rainfall, if the surrounding soil is saturated, basements may experience water leaks. Basement bathrooms can benefit from the installation of moisture-resistant drywall through the entire bathroom.
Considerations
Do not install a moisture-resistant panel over a separate vapor barrier, such as polyethylene film, which can trap moisture in the panel, causing the gypsum particle interior to degrade gradually. Moisture-resistant drywall may not reduce the risk of mold, but mold-resistant drywall usually repels moisture in addition to discouraging mold growth. If youre replacing drywall in a bathroom with a previous mold problem, opt for mold-resistant panels.
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