Hot answers tagged underlayment
Per the Armstrong subfloors and underlayment manual, all Armstrong vinyl tile installations require an underlayment. If you don't have an approved underlayment, you may not receive full warranty coverage for the tiles. Further, the underlayment is secured using mechanical fasteners through the old tiles to the subfloor, so you don't have to worry about ...
You have the answer in your question. I've used felt cushions in appartments to reduce traffic noise and it makes a huge difference. But beware, if you have a very uneven subfloor you'll get a lot of squeaky noises and no rosin paper or cushions are going to fix the problem.
You probably missed "the best option for reducing noise to below" if you put down new subfloors and didn't put insulation under them (assuming you actually removed the old subfloor and had open joists.) Your next-best option would be to blow in insulation from below. If you are already committed to nail-down flooring, I don't think the underlayment will ...
I don't know what Green Glue is other than it appears to form a gasket of sorts. My thoughts would be to try insulation along with layering some dis-similar materials to avoid conductive transfer. I'd suggest a sandwich of XPS foam, topped with cork underlayment, then your finish floor (which, ideally, could be dry-core subfloor panels topped with ...
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