ROCKWOOL® Cavity insulation is a rigid full-fill insulation solution for masonry cavity wall construction, suitable for use in new builds or extensions. Lightweight and easy to handle, the batts are simple to install and provide a close fit against brick and blockwork, adapting to imperfections in the cavity wall. ROCKWOOL® Cavity wall insulation is available in a range of thicknesses. 


  • BBA certified for all exposure zones 
  • Outstanding thermal and fire insulation 
  • Does not require TCBs 
  • Prevents water transmission from the outer to inner leaf 
  • Non-combustible (Euroclass A1) 
  • Superior fit against blockwork 
  • No sagging or slumping