I have Romanoff oak parquetry on the floors, new one shown here with 160mm tiles. The floor is uneven. 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.
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 -- BUT the problem is that the middle-layer cement is not even, it is 1cm in other end while 2cm in other end. Only backer board available is even quality of 2cm thickness which would require grinding about 1cm concrete.
I have identified the following steps:
I. 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?
II. installation of some other type of floor between the cement and the parquetry
II.1. install noise-cancellation floor if needed
II.2. the floor has 1cm cement on the other end, 2cm cement at the other end and everything in-between between 1cm and 2cm -- so floor is not nicely levelled horizontally.
III. using 2-phase glue to install parquetry to the extra layer
IV. sand the installed floor and the old floor to make it on the same level
where the hardest part is probably II because we cannot use ready-made concreate layers, the backer board get thinner on the other end and the market seems to have only 2cm backer boards available.
How to renovate the old parquetry with a hole in the old parquetry?