With very high humidity, the parquet dries with a “boat”. It is also necessary to take into account such an important point as the level of moisture of the concrete base: an outwardly dried -up base, may contain a considerable amount of moisture, which the parquet easily absorbs. As a result – exfoliation of parquet from the base. One solution is moisture meter and lack of haste.
The next point should be noted the degree of excerpt of the parquet. It is better to wait until the parquet [1] will acquire the humidity of the room (1.5-2 weeks) than to see the deformed coating through the same period when hasty laying.
It is best to lay parquet on OSB or plywood, because it is additional heat and sound insulation. This is a quick and reliable installation, t. To. OSB and plywood are glued and nailed to the concrete base with dowels, and the parquet is attached with a nail, as opposed to installation directly on the base. But if there are hard financial restrictions, then this option is acceptable.
