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What is the total thickness of the board? Is it 40mm + 12.5mm = 52.5mm or 40mm?

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What is the total thickness of the board? Is it 40mm + 12.5mm = 52.5mm or 40mm?

The board has a total thickness of 52.5mm, it comprises of 40mm insulqtion bonded to a 12.5mm plasterboard.