The laminate floorings, such as laminate wood, vinyl LVT or SPC, are floating floorings, that is, they are not glued or adhered to the mortar or surface on which they are installed. These kinds of floorings have a natural movement, which can be increased by walking on them, and this movement can sometimes generate a particular sound, similar to that produced by walking on a wooden structure.
This is a normal behavior of this type of surface, since those are floating surfaces. It is normal for phenomena such as movement and sounds to occur when walking. This behavior is accepted in the international standards for this type of flooring.
In addition, floating floorings rest on a foam layer that prevents contact between it and the surface on which it rests (the mortar). This foam layer minimizes the sound that can be produced, but can slightly increase the movement when walking on it.
At night, when the environment is very quiet, the noise can be perceived more strongly.
When there are hygrometric changes (variations in the degree of humidity in the air) derived from the environment itself (relative humidity) or from the mortar, the wood fibers of the laminate flooring experience a phenomenon of expansion and contraction, that is, it “swells and contracts”. These changes are millimetric, but they cause a “crunching” noise, or else, tension accumulates, which, when stepping on the flooring, the pressure is released and make a sound.
These phenomena can be reduced a little with the use of a high-density foam underlay, which can minimize the movement of the floating floor and therefore its sound.