No matter which subfloor you choose, if you are installing it in a moisture-prone area or on a concrete subfloor, you should consider using a moisture barrier. This will protect your laminate floors from moisture damage for years to come. If the amount of moisture exceeds what the bottom layer can handle, then you will need to install a moisture barrier. If it is within the capacity of the bottom layer, then it can do the job.
If you are installing a new floor over a new or old concrete subfloor, you should make sure that no moisture gets in and ruins your investment. Since concrete is porous, it is wise to install a vapor barrier over the concrete subfloor before laying down the floor. Vapor barriers are used for both walls and floors, but in the case of floors, they are usually referred to as moisture barriers. The installer assured us that the glue he used would protect the floor from moisture, which was not the case.
We suggest that you invest as much as you can in subfloors, as performance usually depends on the cost of the subfloors. However, what you cannot see (the subfloor of the floor) is just as important and deserves equal attention. A moisture barrier is used when installing floors or walls in areas prone to moisture or excessive moisture, such as basements, ceilings, or tight spaces (source). He takes an informative approach in his blog posts and takes pride in his ability to conduct thorough research to gain a better understanding of floors.
The bottom layer, also known as “filling”, is a spongy, closed-cell plastic foam sheet that comes in rolls. Once the floor is installed, the vapor barrier underneath will not be damaged over time since it is not stepped on or exposed to other elements. When moisture penetrates the floor, it can cause mold and possible water damage. After considering the climate and materials, you can decide if you need a vapor barrier for your floors.