Boarding is the point after which everything behind the wall is expensive to reach again. Once drywall is up and taped, accessing the cavity means opening it. Opening it means reopening the work, refinishing, and living with disruption.
What has to be genuinely complete before the walls close is every service, every rough-in, every blocking decision. Plumbing has to be rough-in complete. Electrical has to be in place. HVAC has to be ducted. Insulation and vapour barriers have to be installed. Every one of these is expensive to add after drywall closes them in.
Protecting new board from the wet trades that follow is a practical detail. Waterproofing, tiling, all the processes that bring water into the bathroom happen after boarding. New board has to be protected from this water during construction. Sealing it or putting up protection prevents damage while the finishes are being installed.
Reopening a closed wall is the failure this stage exists to avoid. The cost in time and disruption is enormous. A missed service, a forgotten blocking detail, a miscommunication — all of these become reopening projects if discovered after boarding. The stage is designed to catch these before boarding closes them in. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This ensures quality outcomes. This e