How to Install Moisture Resistant Drywall: Best Practices for Wet Areas Most moisture failures in moisture resistant drywall installations are installation failures, not product failures. The sequence below is the one that keeps a wet-area wall performing from handover to year fifteen. Step 1 — Check the Substrate and Framing Framing must be dry, straight and free of standing water. Stud spacing: typically 600 mm centres maximum for 12.5 mm board, reduced to 400 mm for