A floor vapor barrier sometimes referred to as a moisture barrier, is typically a plastic sheet that prevents moisture from penetrating a wall or flooring. A moisture barrier is used when constructing walls, floors, or ceilings in areas like crawl spaces, basements, or roofs susceptible to excessive moisture or dampness. So, do you need moisture barrier under laminate flooring on concrete?

If you’re putting flooring over concrete, you’ll usually require a vapor barrier. Therefore, even through concrete, moisture will travel from a high-humidity location to a low-humidity one. Therefore, since your concrete subfloor is porous, it is a good idea to lay a vapor barrier over it before installing your flooring. Doing this can prevent water from rising as vapor and damaging your floors.

Additionally, vapor barriers are less typical in moderate regions. However, a vapor diffuser can be necessary if the weather there is extreme, such as snowy winters, frequent April showers, and muggy summers.

Moisture barriers are more important on some levels of the house than others. Therefore, a moisture barrier would be necessary for those levels that experience more water vapor. On the other hand, the ground level may be more prone to moisture if the house doesn’t have a basement.

If you choose a wall that requires sealant, such as tape or glue, you only need your vapor barrier and the vapor barrier selected adhesive, a utility knife, or scissors. The procedures for such an installation are as follows.

1. In any place where moisture is a risk, lay out your moisture barrier.
2. Attach your sheet with tape to the room’s edge subfloor. When fusing two sheets, overlap them by six inches for the best moisture control and use vapor barrier tape to hold them together.
3. As you move around the room, keep coming from the same edge and going in all directions.