Rockinsul RB Slabs:Rockinsul Building Rolls is used mainly in pre-engineered buildings for roofs and walls to achieve excellent thermal and acoustic insulation. It can be used for both under purlin and over purlin application on the roof. Stone wool fibres in Rockinsul Building Rolls are fine and uniformly distributed that ensures excellent & uniform thermal resistance. The stable stone wool fibres bonded with thermosetting resins are light in weight, strong and resilient.