These subfloors typically gather a lot of moisture especially in moisture rich areas where humidity or heavy rain is common.
Floors with barriers.
Glued floor barriers glued flooring is often installed to concrete subfloors.
If you are preparing to glue down your wood flooring to a cement subfloor you will need a heavy moisture barrier product.
Our moistureblock is a 6 mil polyethylene film vapor barrier that is used during the installation process with floating laminate luxury vinyl planks and engineered wood floors.
Short of that placing a sound barrier in the open joist spaces between the floors is an effective way homeowners to slow the transmission of noise.
This is done is by removing the ceiling drywall and inserting anything from r 13 to r 20 fiberglass insulation in the joist space.
No need to bother with large fold out low quality off spec construction grade films which can be bothersome and hard to use before the floor is installed.