If the existing insulation is wet, remove the current parts and replace it completely. When building up a flat roof, there are no limitations in mixing different materials.

Hollow-core concrete slab, renovation
New additional structure:
  • New waterproof roof membrane
  • Mechanical fasteners
  • Additional thermal insulation: PAROC ROS 30g (grooved) + PAROC ROB 80
  • Dry expanded clay

Existing structure:
  • Old roof membrane 
  • Old thermal insulation: EPS, Cork, PUR, etc.
  • Supporting structure: hollow-core slab