Isowall sandwich panels

Isowall Sandwich Panels consist of an insulation core with facings of flexible materials and are produced on a continuous laminating line using a two part polyurethane adhesive system. They are used in the building of insulated structures such as coldrooms, classrooms, distribution centers, freezers and abattoirs.

Useful Information

The core materials that can be used are expanded polystyrene (EPS), Rock wool, PU/PIC, POLYPHEN and extruded polystyrene (XPS).

The facing materials are pre-painted galvanized steel, Aluminum or GRP.

The standard width of panels is 1200mm and 1000mm.

Panels can be manufactured to any transportable length.

The panels have a male female INTA lock system and various face profiles can be produced. The profiles included are: flat, fluted, shadow line, micro rib and raised rib.

Advantages and Disadvantages of the different core materials

EPS Core Panel


  • It is the most economic form of insulation
  • It is extensively used due to its insulation properties and high strength to weight ratio
  • It has a high resistance to water absorption
  • The flexible core is not easily damaged
  • Its relative low weight makes panel installation an easy process


  • When exposed to a fire the core material starts softening from 90̊ C and the panels lose their structural integrity
  • The core material ignites at 350̊ C in air

Further information : EPS Insulation

Rock wool Core Panel


  • It has excellent thermal and acoustic properties
  • It is fire safe
  • It is chemically inert and CFC and HCFC free


  • The price is higher
  • The panels are fragile and need to be handled carefully
  • The panels can delaminate with dynamic loading of excessive foot traffic
  • The core materials are imported which adds 8 weeks lead time to the start of installation
  • The high panel weight requires mechanical equipment for installation

PU Cored Panel


  • The panels are made using fully cured Polyurethane foam slabs
  • They are CFC free but not HCFC free
  • Although Polyurethane is not non combustible, it does not burn in the same way as EPS
  • Polyurethane panels, when subject to fire, forms a carbonaceous layer which retards further flame spread and maintain integrity for longer


  • Polyurethane core can break
  • The panels need to be handled carefully
  • When burning, the core of the panel emits toxic fumes (Cyanide gases)

Further information : Isolite Products