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Naildriver
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Insulation between floors is often not indicated since the temperature will remain the same between them. HOWEVER for sound deadening (not proofing) Roxul or Rockwool installed in the bays will go a long way.

Depending on how thick your studs are, will dictate the thickness of insulation. 2x4 walls will house R13 to R15, while 2x6 walls can house up to R19. You do NOT want to crush your insulation as the loftiness is what gives the best insulation factors.
 
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