I don't know if you're doing ceilings or floors as well, but a cork underlay can go under your current flooring and works WONDERS for footsteps, running and oth

I don't know if you're doing ceilings or floors as well, but a cork underlay can go under your current flooring and works WONDERS for footsteps, running and other transition sounds between floors. We did ours through Home Depot- you can order it in the carpet section. You can hire them to install or do it yourself. Went from hearing a herd of buffalo walking to glorious silence.