I am glad you asked and please trust me that I am not debating that people do get good isolation results with the IKEA APTITLIG chopping boards (specially since I know they are widely used). As you can see the hollow boards are filled with little planks, spaced and glued in an alternating pattern creating voids in two directions.
So once I knew this I did not want to use IKEA APTITLIG anymore preferring boards without air gaps. I ended up replacing them with same thickness extreme high density Panzerholz boards. No honest comparison, Panzerholz being more dense, with a lower transmissibility and higher internal damping then other types of wood (it does not even float in water).
- Density bamboo plywood : 650-850 kg / m3
- IKEA APTITLIG bamboo plywood: 575 kg / m3 (my guess)
- Panzerholz : 1350 - 1400 kg / m3
