Which plasterboard thickness to choose (9.5 vs 12.5 mm)

In short: 12.5 mm for partition walls, 9.5 mm for ceilings (lighter), and in bathrooms/kitchens use moisture-resistant boards (green). Where fire protection is required, use fire-resistant boards.

Reference table

Thickness / type	Where it is used
9.5 mm standard	Suspended ceilings, curved surfaces (lighter and more flexible)
12.5 mm standard	Partition walls, wall cladding
12.5 mm moisture-resistant (green)	Bathrooms, kitchens, wet rooms
12.5 mm fire-resistant	Areas with fire-protection requirements

For walls

The standard is the 12.5 mm board. For better sound insulation or strength, use double boarding (two layers per side).

For ceilings

The 9.5 mm board is often used — it is lighter and easier to handle overhead; 12.5 mm also works.

Bathrooms and kitchens

Choose moisture-resistant boards (usually green), resistant to condensation and damp.

👉 See which profiles to use and calculate materials with the calculator.