Look for evidence, not just standing water
Efflorescence, staining, peeling coatings, musty odors, damp corners, rust, or repeated dehumidifier demand can all point to moisture conditions worth investigating.
Match the fix to the source
Surface condensation, foundation seepage, plumbing leaks, poor exterior drainage, and groundwater pressure are different problems. The right repair depends on the actual source.
Finish after the space is ready
Once moisture issues are addressed, material choices for walls, insulation, flooring, and trim can be made with much more confidence.