In alt.home.repair, on Fri, 23 Apr 2021 14:45:02 +0000, Stonecoldmd
wrote:

Having similar problem with newer home. Floor above feels like Im walking on rice paper with cracks and pops and squeaks. Even on tile areas. Corresponds to heating duct below in unfinished basement ceiling. Dont know whether too much or too little moisture. Have tried bracing subfloor with no success, sinking screws through subfloor into hardwood. Just getting worse. Would appreciate one and all suggestions

Any other homes in your n'hood that look the same on the outside or were
built by the same builders, or even at the same time. Check with them,
if they have had the same problem and what they have done.