Mold resistant drywall swaps the plain paper facing on standard drywall for a coated or fiberglass surface that gives mold spores far less to feed on. It costs more per sheet, but in a bathroom, basement, or laundry room it's often the difference between a wall that stays clean and one you're tearing out again in two years.
Already seeing mold in the walls? Call a licensed local pro now for a fast inspection before you buy any drywall.
What Mold Resistant Drywall Actually Is
Standard drywall wraps a gypsum core in plain paper, which is cellulose, exactly what mold feeds on once a wall stays damp. Mold resistant drywall swaps that paper for a treated facing or, on paperless boards, a fiberglass mat that gives mold nothing to eat.
One limit applies to every version: none of it is waterproof. Shower stalls, tub surrounds, and anywhere tile sits over a wet wall still need cement board or a tile backer, not drywall of any kind.
Types Compared at a Glance
- Green board: the older, wax-coated option. Sheds water fine but isn't rated for mold the way newer boards are; good for a bathroom's dry walls and ceiling, not wet areas.
- Purple board: added mold and moisture resistance over green board, usually with a longer warranty.
- Paperless / fiberglass-faced board: a fiberglass mat instead of paper. The strongest mold performance of the group, good for basements.
- Cement board: not drywall at all, but the tile backer for showers, tub surrounds, and any wall water hits directly.
- MgO board: a newer, inorganic option with strong mold and fire resistance, priced above standard mold-resistant panels.
Gold Bond, USG, National Gypsum, and CertainTeed all sell purple and paperless board, widely stocked at supply houses and big-box stores.
Where to Use It (and Where You Still Need Cement Board)
Mold resistant drywall earns its keep in bathroom walls and ceilings outside the shower, kitchens around sinks, basements with high humidity even without a leak, and laundry rooms near washers and water heaters. Tub surrounds and shower stalls still need cement board or a foam tile backer, not drywall. If mold is already growing on a bathroom wall, handle the bathroom mold removal first; a new board won't clear the problem underneath it.
Not sure what's behind your walls? Check the paper color on a scrap piece or in an unfinished spot like a closet or attic panel: green or purple tinted paper usually signals a moisture-resistant board, plain gray or tan paper is standard drywall. Staining, bubbling paint, or a musty smell point to standard drywall reacting to trapped moisture; our guide to spotting mold on walls covers the signs.
Installation and Cost Factors
Installing mold resistant drywall uses the same tools and taping process as standard drywall, so any contractor or confident DIYer can hang it without special training. Paperless boards weigh more and chip easier at the cut edges; crews handle them with extra care.
Cost shifts with the board type, room size and sheet count, whether cement board is also needed nearby, and labor, which climbs when old moldy drywall has to come out first. Get a firm quote from a local contractor rather than pricing sheets online; one covering removal, disposal, and installation beats a materials-only estimate.
Rebuilding After a Mold Problem: Should You Upgrade?
If a leak or long-term humidity problem already ruined a section of wall, this is the moment to switch materials, not replace like for like. Order matters: the mold and its moisture source need to be handled by a qualified pro first, not covered over with new board. Once the wall is dry, mold resistant drywall is a reasonable upgrade, especially after a basement mold removal job or in a bathroom that's had trouble once.
Skipping that step is the most common mistake homeowners make. New drywall, even the best sheet on the market, won't stop mold from returning if the leak behind it was never fixed. Professional mold remediation handles that part; the drywall choice comes after.
FAQ
Is mold resistant drywall worth it?
In a bathroom, basement, or laundry room, yes. The extra cost is small next to redoing drywall a second time, though it won't fix a room with an active leak or a dead exhaust fan.
What's the difference between mold resistant drywall and green board?
Green board sheds water with an older wax-coated facing but isn't rated the same way for mold. Purple and paperless board add coatings or a fiberglass facing tested specifically against mold growth.
Can mold still grow on mold resistant drywall?
Yes, if a wall stays wet long enough. The facing gives mold spores far less to feed on than plain paper, but surface dust, paint, and dirt can still support growth during a sustained leak.
Which rooms need mold resistant drywall most?
Bathrooms, basements, laundry rooms, and kitchens around sinks and dishwashers see the most benefit. Dry living spaces and bedrooms rarely need it.
Can you paint mold resistant drywall?
Yes, the same way you'd prime and paint standard drywall. In bathrooms and basements, a moisture-resistant or mildew-resistant paint adds another layer of protection.
Call a licensed local pro now to check for hidden moisture before you buy a single sheet of drywall.
FAQ & Remediation Guidelines
Q:Is mold resistant drywall worth it?
In a bathroom, basement, or laundry room, yes. The extra cost is small next to redoing drywall a second time, though it won't fix a room with an active leak or a dead exhaust fan.
Q:What's the difference between mold resistant drywall and green board?
Green board sheds water with an older wax-coated facing but isn't rated the same way for mold. Purple and paperless board add coatings or a fiberglass facing tested specifically against mold growth.
Q:Can mold still grow on mold resistant drywall?
Yes, if a wall stays wet long enough. The facing gives mold spores far less to feed on than plain paper, but surface dust, paint, and dirt can still support growth during a sustained leak.
Q:Which rooms need mold resistant drywall most?
Bathrooms, basements, laundry rooms, and kitchens around sinks and dishwashers see the most benefit. Dry living spaces and bedrooms rarely need it.
Q:Can you paint mold resistant drywall?
Yes, the same way you'd prime and paint standard drywall. In bathrooms and basements, a moisture-resistant or mildew-resistant paint adds another layer of protection.