Are most new subs the same in 2018

Irvrobinson

Irvrobinson

Audioholic Spartan
Is your residence a single tenant or multi family structure? It is quite common for apartments or condominiums to be stick construction but have gyp-crete (up to 2" or so) poured over a wood sub floor. It is not as inert as concrete on a steel sub floor (as @KEW suggested) but is loads (no pun intended because, you know, concrete) better than a straight plywood on wood joists. I'd have to look up the STC, which may prove interesting.

EDIT: I reread your comment earlier - third floor, etc.,
Multi-family. Built around 2006, apparently. Never heard of gyp-crete, but your response gives credibility to the leasing agent's claims.
 
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