Insulation batt width


Planning to insulate the ceiling of my garage (floor of family room above it). Joists are 2x8s 16 inches on the center so the gap is about 15″. Looks like theres both 15″ and 15.5″ width batts available. Anyone have a recommendation? Will the 15.5 be a better snug fit or will 15 truly be perfect assuming it unpacks 100% from the compressed bags? I’ll be using R30c which will be compressed slightly in depth. via /r/DIY

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