If you decided to reconstruct your old parquet flooring and also to throw out the scoria that is often under the wood flooring in the apartment buildings then you were for sure confronted with a question what would be a good replacement for the scoria. There is definitely not many choices but you have to decide if you will choose a dry process or if you will prefer a wet process.
Replacement of the scoria with dry wood ecological granulate CEMWOOD
You can replace old scoria on your floor very fast with wood granulate with mineral coating CEMWOOD. You can made ground from it to height of 18cm and a huge advantage with this material is speed. More or less if you decide to reconstruct your floor in an apartment with exchanging of scoria, you can exchange it during the first day of reconstruction and install the flooring on second day. You can read more about this wood granulate CEMWOOD at www.cemwood.de where you will find all necessary information.
A short video about how you can use the new construction material EcoPearls, or CEMWOOD (they are the exact same materials)
Following video below is from my first job where I came across with this granulate personally and I have to say that it really is an exceptional material:
Replacement of scoria with a wood grill and OSB plank
With the dry process you replace the scoria with a wood grill. You have to calculate the height of the grill so you will get it to the same height that when you will put the flooring on it will be the same height as the next room or hallway. I suggest you to make the grill with spaces around 30 cm wide. So the wood joists won’t be more than 30cm from each other. I also suggest you to fix the grill properly to the surface. Never just put it on the surface loosely. Wood likes to work and such unfixed grill can make a lot of trouble in the future by making unwanted sounds.