I put 19mm agglo plates. To make a floor I have a gap between chevron variable between 55 and 65. I realize that it is too weak: I would like to know if I double the plates by crossing the joints and screwing them between them, is it that I am going to gain strength or is there another solution?
Crossing the plates will not change your problem. The maximum spacing should be 40 to 45 cm. The best would be to strengthen the joist by adding rafters between existing ones. You would not have to double your paneling. Otherwise it would be necessary to put plates of 40 mm so that the rigidity of the floor is assured (but taking care of overweight...
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