What is acceptable to leave behind drywall when putting up new drywall and insulation?
Ideally, you want nothing underneath the drywall except studs, insulation, and vapor barrier (where appropriate). Staples (unless they project up quite a bit) won’t affect the finish of the drywall. Paper sheets have the potential to make rotting worse if water gets into the space, so you should probably get those out of the way. Plastic sheets are benign, but could cause problems if insulation is later blown into the wall space.
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