Well constructed 1971 townhome: should I be concerned about weight regarding faux wood porcelain floors on second floor?

I have a townhome built in 1971 in southern california. Actually its from one of the better known constructions of the time and my parents have a SFR from the same age.

We have removed all the carpets (30years or maybe original... yuck) down to the subfloor. My wife (read: boss) wants non-carpet in the whole house and we decided on porcelain for the durability and moisture resistance... plus we plan on turning this into a rental in a decade.

So the subfloor is wood on the second floor (first is concrete). I know I need cement backer on it, and then the thin set, finally the tile itself. Should I be concerned about 600 sq ft of this on the second floor?

submitted by deten
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