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Rockwool rollbatt has a thermal resistance of 0.044W/mk. Rockwool rollbatt also has a fire resistance and an acoustic resistance greater than standard glasswool. Rockwooll rollbatt is used as an attic insulation but is priced higher than standard glasswool due to the added value in the acoustic and fire resistance. This product can still be used in attics as insulation but is not as cost effective as Knauf or Moy Isover. Knauf and Moy Isover will give the same thermal resistance as rockwool.