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Thanks.. I've seen that, but wasn't sure since it involves both lumber and steel here.

Hello Experts, I plan to install marble tiles in the living room soon but need to take care of the sub floor issue first. I'm hoping someone here will help me out with this. The sub floor is 3/4 plywood resting directly on steel beams (Not "I" but box) that are 48" apart ( yes no joists)...