Perhaps you like unnecessary flexure in a floor, but can you really countenance omitting a simple step that would improve the installation? Instead of having the two layers bonded and acting as one, you'd prefer to save on a few pounds of screws or nails?
R
The previous installation worked just fine except for the particle board that got wet (so this one will be better). It isnt a simple step to put down 2 layers instead of one but if it will make you happy i will put some 1 1/4 ring shank nails in the field as well as nailing it firmly to the joists. I have no problem with that. Otherwise I'm not sure what you mean by omitting a simple step.
That is the simple step. You want the two layers to act as one - monolithically. If you don't physically attach the two layers together with glue/screws/nails the end result will not be nearly as strong and stiff.
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