A 6 mil vapor barrier blocks all moisture from the subfloor from ever reaching your flooring.
Moisture barrier for concrete subfloor.
For optimal moisture control you will want to overlap the poly barrier by at least six inches.
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.
If you have a plywood subfloor over a concrete slab check the moisture level of both floors.
The barrier comes in rolls about twenty four inches wide.
If you have a concrete floor that s in continuous contact with a source of moisture you re going to have problems.
This video describes the process of installing a moisture barrier over a concrete subfloor.
A vapor barrier is not the same as an underlayment.
Usually buying the 2in1 is an easy and more economical option.
This is why a vapor barrier under concrete is essential.
The reason is quite simple.
The concrete subfloor must be sufficiently strong to safely support the flooring furniture and people in the room.
You will lay the flooring lengthwise to this wall.
How to install vapor barrier on concrete floor under laminate flooring.
When rolling out the moisture barrier you want to go from wall to wall and cover the entire floor.
The presenter is using 6 mil thick poly barrier.
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.
Check the moisture level of the subflooring using a moisture meter.
Vapor barriers come in two types 6 mil vapor barrier roll.