The best mold resistant basement materials are inorganic or moisture-tolerant products: fiberglass-faced (paperless) drywall, cement board, PVC wall panels, mineral wool insulation, closed-cell rigid foam (XPS or EPS), and pressure-treated or Exterior-rated plywood. The rule is simple â mold needs organic food and moisture to grow, so every material you put in a basement should … Read more
The best plywood for basement walls is usually ½-inch ACX plywood. It has a smooth face, exterior-rated glue, and enough stiffness for walls framed 16 inches on center. For workshops, storage rooms, and mechanical spaces, ½-inch or â -inch CDX plywood is a cheaper alternative. It is rougher than ACX, but appearance matters less in utility … Read more
The best plywood for a basement subfloor is 3/4-inch tongue-and-groove plywood with an Exposure 1 bond classification (such as CDX or Sturd-I-Floor), installed over a vapor barrier and rigid foam insulation â never directly on the concrete slab. If any wood touches the concrete itself, such as sleepers or bottom plates, that wood must be … Read more
Drylok and a vapor barrier are not interchangeable â they solve two different moisture problems. Drylok is a waterproofing coating that seals the masonry wall itself, stopping liquid water and vapor at the surface. A vapor barrier is a plastic or foil membrane that controls moisture inside a wall assembly, floor, or crawl space â … Read more
Insulating basement walls the wrong way is one of the most expensive mistakes in home improvementâand it usually looks fine for the first year or two. Quick answer: The safest, most reliable way to insulate basement walls is rigid foam board (XPS, EPS, or polyiso) installed directly against the concrete, with all seams taped and … Read more