Not trying to cause trouble by posting, only pointing out the wrong info that someone might take as gospel and cause problems down the road.
If you use those joist sizes mentioned, it will not support stone. That's even with two layers of plywood. The span has to be back around 10 to 10.5 ft. ( the span is a guess on my part.) The first sentence is true for stone.
If you are using engineered joists for the building of your home, it is the engineers responsibility to design a system that will support the intended use. It is also the owners responsibility to tell the GC or the engineering firm the intended use. This way they can design a system to accommodate both live and dead load to include what you plan on having for furniture and people.
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