The underlayment can be of two or three layers. Working with tongue and groove in 4 sides it comes already calibrated, polished and painted ready for installation. The lower layer is called support (phenolic plywood birch E1 class in our case) and it is glued to the upper layer called the “noble wood” in solid wood. Quick and easy to install it can be already walked on after 24 hours. The parquet guarantees stability, durability, practicality, beauty and elegance.