Thanks for the advice. Nail down simply won't work through an underlayment? Or it just isn't usually done? Just curious as to the reasoning here. Always wanting to learn more about flooring. Thanks again.
Quiet Walk is specified for floating floors, ( Hardwood or Laminate). It is not quite dense enough for naildown. The same company manufacturers Insulayment ( looks just like Quiet Walk ). This is a very dense underlayment for naildown or gluedown. I have done many installs with it. Insulayment qualifies for sound requirements in condos, also other benefits. Also have done many installs over cork underlayment.