50mm Rockwool Frontrock Plus is a rigid dual density thermal and acoustic insulation slab made from volcanic rock, thus extremely durable, fire resistant and specifically created for external wall applications to go directly under render. Using Frontrock Plus you can be sure that the facade will be durable and safe. Due to the two-density solution -- hardened top layer ensures stability and maintains the stiffness while the bottom layer compensates for surface unevenness, creating an even surface for the entire facade.  The slabs are made from 97% recyclable and renewable material which also makes them environmentally friendly since they can lower the carbon footprint of the household.