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Gypsum plaster - 20kg/M2
Gypsum plasterboard direct (without a plaster skim) - 32kg/M2
Plywood (WBP) - up to 30kg/M2
Lightweight tilebacker boards - Up to 40kg/M2, (Dependant upon the type and thickness of the board).
Glass reinforced cement sheets - Up to 50kg/M2, (Dependant upon the type and thickness of the board).
Gypsum fibre boards - Approximately 35-40kg/M2
Tanking is highly recommended in a wet room even if the wet room has been constructed with water-proof tile backer boards (screw holes and joints in the boards will leak!).
Applying a tanking system in intermittenly wet areas such as showers, over the bath tub and basin is a really good idea, without it if water comes into contact with plasterboard, joists or concrete over time you will experience problems that you will not appreciate, costing you a lot of money in damage and repairs.
Tanking therefore in our professional opinion is essential