I'm building a basement bedroom under a kitchen with a tiled floor. Engineered joists as 12" O.C. I'm going to fill joist cavities with Safe-n-Sound, two layers of 5/8" drywall with carpet glue in-between, and also Sonopan.

Additional soundproofing options (decoupling of walls and ceiling) will also be implemented.

I understand that you recommend Sonopan to go across the joists, however the basement has low ceiling and 3/4" is huge.

Would you know what assembly order (in the joist cavities) would be more effective against impact noise coming from things dropped onto kitchen tiles?

1. subfloor then Sonopan, then two layers of 5/8" drywall
2. subfloor then two layers of 5/8" drywall then Sonopan