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Moving to the HT Construction Forum...
I’m not sure this is going to get you anything. Typically a solid core, air-tight door is all you need. While your plan might better soundproof the door, there’s no gain in making it better soundproofed than the walls are, especially if they weren’t built for soundproofing (staggered studs, double or triple sheetrock, etc.).
Regards,
Wayne A. Pflughaupt
