Can mold on pressure-treated wood be a problem? Joe Koza2025-07-03T15:00:30-04:00 Yes. Even pressure-treated wood can grow mold on the surface if it's left wet and dirty. Keep it sealed, clean, and dry to prevent problems [...] Can mold on pressure-treated wood be a problem?Joe Koza2025-07-03T15:00:30-04:00