I have Romanoff oak parquetry on the floors, new one shown [here](https://www.romanoff.fi/verkkokauppa/puulattia/massiiviparketti/roma-tammi-natur-mosaiikki-160mm/) with 160mm tiles. The old parquetry in the pictures has become a bit dark that I want to polish besides filling the hole with new parquetry tiles. The photos below show the hole, filling the earlier kitchen island, which I now want to have as open space.

[![enter image description here][1]][1]

[![enter image description here][2]][2]

[![enter image description here][3]][3]

where you can see that current parquetry is perfectly aligned as shown by laser, also in vertical way. The size of the area is 2m2, taking 80 new tiles (4 x 20), surrounded by already installed parquetry. The exact size for the backer board is 0.64m x 3.2m (=4*0.16 x 20*0.16) i.e. 2.048m2.

I have identified the following steps:

1. straighten up the underlying concrete with a spirit level and sanding/grinding? How coarse does the underlying floor stay for the glue to attach to it later?

2. installation of some other type of floor between the cement and the parquetry: install noise-cancellation floor if needed

3. using 2-phase glue to install parquetry to the extra layer

4. sand the installed floor and the old floor to make it on the same level


**How to renovate the old parquetry with a hole in the old parquetry?**

  [1]: https://i.sstatic.net/eEvZ8.png
  [2]: https://i.sstatic.net/m4s9Z.png
  [3]: https://i.sstatic.net/RptZt.png