A:
Damping and, or eliminating a noise or noises is subjective. Basically the thicker the base the more dampening achieved to that one side of the structure.
Typically soundproofing may achieve some satisfaction but is not absolute with louder creeks and crackling noises.
Wood joists age and become brittle typically causing main traffic areas and pivot-points to more deflect, most weakening smooth fasteners, and producing more noise.
Other causes, found more in new construction, can include movement of attached fittings, or pipes, and etc. that rub across joists and other objects that are under the flooring or subfloor material.
Most commonly the cure for noise is identifying where the noise is coming from, and nailing it down with a serrated type fastener until the noise is gone. If noise still persists, subfloor may have to be opened up to solve the problem. Staples with double-sided, chiseled points can only add to the problem down the line.
Deflection typically equals what three people can produce standing in the same location.
More dramatic solutions may include reinforcing the joists and, or substructure.
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