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Old 19th September 2019
Lives for gear

Basically, whatever gives you the highest mass AND the largest gap between the existing floor above you and the new drywall, is the option you should go for.

However, having said that, what you propose might not have very much effect at all on reducing the noise levels in your room. All of the noises you are talking about are structure-borne, so they are in the building structure itself. That implies that they are not just in the ceiling above you, but also in the walls around you. Thus, isolating only the ceiling might not have a large impact on total isolation, unless you also isolate the walls... which probably includes things like doors, windows, closets, etc.

Sorry to be the bearer of bad tidings, but I fear that, even though your plan for the ceiling is good, by itself it might not produce a major change in noise levels.

- Stuart -