If you have a plywood subfloor over a concrete slab check the moisture level of both floors.
Moisture barrier for concrete subfloor.
A vapor barrier is not the same as an underlayment.
With your concrete subfloor you will need either a standard foam underlayment with a moisture barrier film or a 2in1 underlayment with moisture barrier already installed.
You will lay the flooring lengthwise to this wall.
If you have a concrete floor that s in continuous contact with a source of moisture you re going to have problems.
The concrete subfloor must be sufficiently strong to safely support the flooring furniture and people in the room.
The presenter is using 6 mil thick poly barrier.
The barrier comes in rolls about twenty four inches wide.
The reason is quite simple.
Snap the chalk line over the top of the concrete or moisture barrier between the marks on opposite walls making a cross in the center of the room.
Usually buying the 2in1 is an easy and more economical option.
Compare the results against the manufacturer s specifications for moisture limits.
Vapor barriers come in two types 6 mil vapor barrier roll.
For optimal moisture control you will want to overlap the poly barrier by at least six inches.
A 6 mil vapor barrier blocks all moisture from the subfloor from ever reaching your flooring.
Vapor barriers are a way to keep moisture from getting into the concrete.
This is why a vapor barrier under concrete is essential.
When rolling out the moisture barrier you want to go from wall to wall and cover the entire floor.
This video describes the process of installing a moisture barrier over a concrete subfloor.