Can you use normal plasterboard in a bathroom if you are tiling full room floor to ceiling

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Answer:

Yes, you can use regular drywall/plasterboard in a bathroom if you plan to fully tile the room from floor to ceiling. Here are a few key points on using drywall in a tiled bathroom:

• Regular drywall (not water-resistant greenboard or cementboard) is fine as long as it won’t be directly exposed to moisture. The tile covering will protect the drywall.
• Make sure to properly seal any cut drywall edges and joints with drywall tape and compound before tiling over it. This prevents moisture from wicking into the exposed paper faces.
• Use cement-based thinset mortar to adhere the tile to the drywall surface. The mortar provides a robust water-resistant bond.
• Use 100% silicone caulk around all edges, corners, and penetrations in the tilework to prevent any moisture migration behind the tiles.
• Take extra care around wet areas like the shower, bathtub, and sink – the drywall should be completely covered without any exposed seams or edges in those locations.
• Ensure there is adequate ventilation either through windows or exhaust fans to minimize moisture buildup in the room.

The full tiled surface acts as the moisture barrier as long as it is installed properly with no exposed drywall edges. Many residential bathrooms are tiled right over regular 1/2″ or 5/8″ drywall without issues. Just be sure all seams are sealed before tiling.