We bought a "fixer upper" last year. We pulled the carpet up in several rooms. Before i put new carpet down, I want to quiet the floors. House was built in 1972. It looks like it has plywood and then floor underlayment (MDF) nailed on top. I used deck screws to tighten down the underlayment, but did not solve the whole issue. If I pull up the underlayment and roll out roofing paper then put back down and screw in, do you think that will solve it? Any other fixes for this issue?