In this case there is less breathability to encourage evaporation which ultimately could cause mold growth.
Floor tile moisture barrier.
Either way if you are going to install a moisture sensitive tile over a slab without a vapor barrier there is a risk that the floor has high moisture content either continuously or after rain events.
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.
Acoustical underlayment w vapor barrier for luxury vinyl flooring 54 pack model qwlv100 2 430 00.
Much cheaper and easier to use than sheet style barriers.
X 1 5 mm premium silent underlayment for vinyl plank laminate hardwood and tile model 22491 125 00.
However moisture levels can and do fluctuate over time so your sub floor moisture measurements may give you a false sense of security.
The majority of commercial and industrial buildings are constructed with a concrete substrate laid over prepared soil called slab on grade.
Floor covering manufacturers whether producers of tile wood carpet or high performance floor coatings publish the maximum allowable moisture content of the concrete over which their flooring products can be installed based on results of various astm.
Seal the floor either chemically or via membranes this creates an impermeable barrier between the sub floor and your flooring which means moisture cannot penetrate into your flooring.
The sheet membranes like ditra provide better waterproofing and isolation to prevent cracks which are important in areas with a lot of moisture like showers or slabs with cracks.
It is possible there was a vapor barrier and it deteriorated over time.
Nance carpet and rug versapad 180 sq.
Den or man cave floor create your very own sports den or man cave complete with a rugged yet comfortable waterproof basement flooring tiles with a built in vapor barrier designed for home gyms.
This underlayment is not only strong and flexible but is light as well making it easier for the installer to take up and down wherever it is needed.