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.
Tile moisture barrier.
Some underlayments have a built in moisture barrier.
Acoustical underlayment w vapor barrier for luxury vinyl flooring 54 pack model qwlv100 2 430 00.
In this case there is less breathability to encourage evaporation which ultimately could cause mold growth.
These are typically used for floating floor applications.
Whether you re laying tile hardwood flooring or laminate flooring underlayment is an essential moisture barrier that also provides insulation and sound absorption.
Need help deciding on underlayment type.
If moisture reaches your vapor barrier behind the tile substrate it should have the opportunity to evaporate this process is hindered when a second vapor barrier is applied or installed to the outside of the tile substrate.
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.
There are a variety of underlayment types including foam and cork underlayment plywood hardboard and cement board.
X 1 5 mm premium silent underlayment for vinyl plank laminate hardwood and tile model 22491 125 00.