Rendered facade for old concrete sandwich panel wall 

Before renovating old walls, first inspect and evaluate the condition of the structures. Design the new structure based on the condition of the old sandwich panel layers.

With the rendering solution below, old walls can be enclosed to a warmer and dryer space, thus reducing or possibly completely stopping frost damage and carbonation of the old structure.

Follow the system holder’s recommendations when renovating/insulating.

Renovation, rendered facade
Existing structure
  • Old supporting structure: pre-cast concrete element
New structure
  • Thermal insulation: PAROC FAS 3, PAROC FAS 4 or PAROC FAL 1 fixed with adhesive and/or mechanically, depending on the insulation system 
  • Rendering system (according to the system holder’s instructions)

If the old surface of the sandwich panel is in bad condition, remove it completely. Depending on the condition of the old insulation layer, leave it intact or take it away. If it is in good condition, leave it under the additional insulation.

Renovation, rendered facade 2
Existing structure
  • Old supporting structure: inner core of the old pre-cast concrete element
New structure
  • Thermal insulation: PAROC FAS 1 with mechanical fasteners
  • Thick rendering system (according to the system holder’s instructions) 

If the old insulation layer of the sandwich panel is in bad condition, remove it completely. Grout the surface of the inner concrete core with mortar or a soft insulation mat. Add the new insulation layer and rendering system added on top of the old supporting structure. Fix the new layer according to a separate plan based on the inspection of the old structure.

Renovation, rendered facade 3
Existing structure
  • Old supporting structure: inner core of the old pre-cast concrete element
New structure
  • Thermal insulation: PAROC FAL 1, PAROC FAS 3 or PAROC FAS 4 fixed with adhesive and/or mechanically, depending on insulation system 
  • Rendering system (according to the system holder’s instructions)

See the video about renovating concrete sandwich panels.