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Can humidity in an apartment (63%) lead to weak plaster on plasterboard walls? I put a piece of kitchen furniture (40 kg maximum with dishes) in these conditions with ankles molly and the furniture fell. There is only plaster of the placo that has not held, the cells have not moved.

Humidity, even high, does not weaken the plasterboard.

On the other hand, no gypsum board can withstand the fixing of a kitchen unit without special precautions: fixing in the frames with reinforcement plate or fixing of fixation in the hard of the wall in case of doubling.

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