Q: Would you recommend installing hardwood over an existing parquet floor (thinking of pre-engineered or 3/4″), nailed down, or should I pull up the parquet first?
A: Absolutely not. Take the parquet out.
Related Q: So, parquet flooring should come up before hardwood of any type, 3/4″ or engineered, goes down, nailed of course?
A: If you want to be sure your new floor is solid and stays that way, I wouldn’t even consider installing over parquet, or even over another strip floor. Take it out. Make sure the sub floor is solid and secure, and then install the new floor.