Is this concidered as a triple leaf?

Hi there, I'm building a control room in my basement and have a question: Is this considered as a triple leaf? -Concrete (ground floor) / XPS (extruded polystyrene) / OSB / Parquet underlay / Parquet (quickstep) What would you recommend between the OSB and the parquet? There's more details about my studio project here if needed: viewtopic.php?f=1&t=20670 Cheers, Sam

No, that's not really a triple leaf system, because the insulation is polystyrene, which is closed-cell.

What would you recommend between the OSB and the parquet?

Use whatever the manufacturer of the parquet recommends. The main thing is to make sure that there's no air gaps inside that floor, in any of the layers. - Stuart -

Thank you Soundman2020, I really feel better now :mrgreen: