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Looking for Cavity Wall Insulation Options?


Cavity wall insulation is the layer of insulation that is placed inside the cavities of the exterior walls of new buildings. It reduces the transfer of heat and cold form outside the building to the inner living area of the building. This is particularly important during our hot summers and cold winters.

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Brands & Options:


When it comes to cavity wall insulation you have medium density expanded polystyrene insulation (PolyWall) and extruded polystyrene insulation (SANBOARD & ISOBoard) options.


PolyWall Insulation - (Expanded Polystyrene) - On Special Nationally


  • This is a very cost effective option for Cavity Wall Insulation Applications!
  • Manufactured Locally in South Africa
  • Sold in 3m2 sheets
  • Medium Density Expanded Polystyrene Insulation
  • Delivered Nationally In South Africa & For Export.
  • Shipped from Johannesburg, Cape Town, Durban, East London or Port Elizabeth


SANBOARD - Cavity Wall Insulation (Extruded Polystyrene) - On Special Nationally


  • Manufactured Locally in South Africa
  • Sold In Various Board Sizes
  • Extruded Polystyrene Insulation
  • Delivered Nationally In South Africa & For Export


ISOBoard - Cavity Wall Insulation - (Extruded Polystyrene)


  • Manufactured Locally in South Africa
  • Sold In Various Board Sizes
  • Extruded Polystyrene Insulation
  • Delivered Nationally In South Africa & For Export


Cost Comparisons:


Extruded Polystyrene & Expanded Polystyrene Insulation come in different board sizes. In order to compare costs between these products, select the thickness of each board that gives you the Thermal R-Value you need and then divide the cost of the board by the area of the board. This will give you the cost per m2 comparison.


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