Richard, it seems pretty clear that these would be considered "tile" and thus exempted, as long as they don't have organic sealants or coatings. A manufacturer's letter to this effect might be good to have in your back pocket.
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It's easier to define based on what it's not. If it's a coating that's added, that's not stone pulled out of the ground or ceramic that's fired, or a cement product that's set, it's probably organic and subject to IEQc4.3 and IEQc4.2 requirements.
I think you basically have the right idea, but that's not how I would put it.Any coating applied at the factory is subject to IEQc4.3 VOC or certification requirements.A coating applied onsite to the floor is subject to IEQc4.2 or IEQc4.3 requirements.
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