The best replacement for roxul is owens corning.

The best alternatives to roxul are rated as following:
★★★★★  owens corning
★★★★  cellulose
★★★★  thermafiber
★★★  fiberglass insulation
★★★  denim
★★★  spray foam
★★★  703
★★  pink insulation
★★  ultratouch
★★  rockwool
★★  quietrock
★  quietzone
  owens corning 703
  johns manville
  pink fiberglass
  oc703

Your alternative for roxul is not listed? Suggest!
Speaking about roxul, one probably shouldn't forget about vapor barrier.

Other search terms related to roxul and their ratings are:
★★★★★ vapor barrier
★★ vapour barrier
You have in mind a companion for roxul and it is not yet here? Propose!



Google Trends

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roxul
owens corning
cellulose