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Bathroom floor reinforcing

Im need to reinforce a chipboard floor in the bathroom. the chipboard got wet and has softened. The leak has been fixed (since December) and the floor is now dry but soft. The vinyl on top is ok and i want to have some planks put up on the underside between the floor joists. needs about 3 planks approx 3m long and 25mm thick to be placed up and fixed in place. the end result should be a floor that is firm and level with the chipboard sandwiched between the vinyl and the new planks