These are typically used for floating floor applications.
Tile moisture barrier.
X 1 5 mm premium silent underlayment for vinyl plank laminate hardwood and tile model 22491 125 00.
Nance carpet and rug versapad 180 sq.
Need help deciding on underlayment type.
Some underlayments have a built in moisture barrier.
Omit plastic when covering bare wood subfloors thereby allowing the subfloor to breathe.
Liquid waterproofing is an outstanding redundancy barrier to the tile installation and allows you to skip the plastic sheeting behind your substrate.
Acoustical underlayment w vapor barrier for luxury vinyl flooring 54 pack model qwlv100 2 430 00.
Floating floor installations when installing laminate or other floating floors over cement vct ceramic tiles or kitchen vinyl use 6 mil poly sheeting plastic as the moisture barrier.
In this case there is less breathability to encourage evaporation which ultimately could cause mold growth.
I still recommend installing a vapor barrier behind the substrate and if you plan on installing a steam generator you will definitely need a vapor barrier.