Spanish company floating floor

Hi, a friend of mine contacted a company to build a small recording home studio. To build the floating floor they use a rubber (??) material sheet: http://portal.danosa.com/danosa/CMSServ ... g=2&site=4

then 40 mm of 150 kg/m3 rockwool , then a plastic sheet and a metal mesh with 50 mm of concrete What about this floating floor??

Mabe it's not very helpful with answering your question. This thread is partly about floating floors on wool. http://forum.studiotips.com/viewtopic.p ... 8c404e8ba6 Florian

thanks florian, but is extrange there is no thread about this floating floor... using rockwool without any rubber...