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Respected National Suppliers Of ISO / SANS Rated (EPS) Expanded Polystyrene Sheets, Blocks, Polystyrene Insulation, XPS Extruded Polystyrene Ceilings Boards, XPS Cornice Blocks, Beads / Regrind & Void Formers In Johannesburg, Cape Town, Durban, East London & Port Elizabeth & For Export


Johannesburg (Gauteng)

011 678 5626

Cape Town (Western Cape)


021 200 5926

Durban (Kwazulu-Natal)

031 940 7056

East London & PE

087 095 3259

National Sales

PolyWall - Polystyrene Cavity Wall Insulation Boards

Extended Special Ends 18th June 2021
In stock
Product Details

PolyWall - Medium-Density Polystyrene Cavity Wall Insulation Boards

Extended Special Ends 18th June 2021!

PolyWall, Medium Density, Fire-Retardant, Polystyrene Cavity Wall Insulation Boards are the perfect solution for insulating your brick cavity walls. Compared to other similar polystyrene products on the market, these boards are extremely cost-effective and ordering them nationally online in South Africa is really quite easy!

Order Collections & Deliveries

Depending on the size of your order, you will have the option to request delivery or to self-collect your order, once cut, from our distribution centers located in:

  • Strydompark in Gauteng
  • Philippi in Western Cape
  • Clairwood in Kwazulu-Natal
  • Wilsonia in East London or
  • Neave Industrial in Port Elizabeth

Order lead time is generally 3 to 5 working days for cutting and delivery, once payment reflects in our bank account. This lead time excludes public holidays and weekends. If you need product faster please call us so that we can try and assist.

Please note that these standard sheets and blocks will not fit in a normal vehicle.

Don't miss out on our current builder online special, check out our google service reviews and when you are ready just order your PolyWall Insulation boards nationally online!

Board Prices

The prices displayed are board prices excluding VAT.

PolyWall - Cavity Wall Insulation

If you are designing or building a new luxury home, commercial or industrial building then you should really consider insulating your walls with PolyWall Insulation Boards.

Cavity Wall Insulation is not expensive and by installing it you will stop the heat from outside affecting the inside room temperature of the building. During winter it will also keep the cold outside. This means that your heating and cooling systems work less hard to maintain a comfortable room temperature and in so doing you will save considerably on electricity costs.

Cavity Wall Insulation, for exterior brick walls is a really important insulation layer in new buildings and Polywall Fire Retardant Polystyrene Insulation Boards are extremely-effective in this application.

Building regulations require that a minimum thermal insulation value of 1 be met in terms of the insulation layer between cavity wall layers.

For residential homes we recommend 40mm PolyWall Insulation boards. Obviousely if more insulation is required then thicker boards can be ordered.

This hidden polystyrene wall insulation layer, like our PolyFloor concrete floor insulation product, ensures that the whole building envelope is thermally efficient and can only be installed when the walls are actually being built.

Read more or simply order your PolyWall Insulation online today! We sell direct to the public and in bulk to building contractors.

When Should You Order Cavity Wall Insulation?

  • PolyWall Insulation Boards should be ordered when you are busy with your floor foundations.
  • If you are installing PolyFloor Insulation boards below you concrete floor slab then these should be ordered at the same time.

Architect & BOQ Specification

" x 1200mm x 2500mm Medium Density, Fire Retardant, PolyWall Cavity Wall Insulation Boards By Polystyrene Product Company. Specifically Designed For Cavity Wall Insulation Applications.

Retail Board Prices

PolyFloor Insulation is sold in 1200mm x 2500mm boards which are 3m2 each. The prices above are board prices excluding VAT. When you order you will need to divide your total insulation area required (m2) by 3 to get the number of boards required.

Building Contractor Board Prices

If you are looking for contractor rates please call us or request a contractor quote via email.

Per m2 Prices

If you are looking for quick per m2 prices, then just divide the board price by 3 since each board is 3m2.

What is Perimeter Wall Cavity Wall Insulation?

  • Cavity Wall Insulation is the insulation layer that is placed between the inner and outer brick layers of the outer perimeter walls of a building.

  • This insulation layer significantly reduces the transfer of heat and cold through the external perimeter walls of buildings.

  • In summer the sun-facing exterior walls get hot and this heat is kept out of the living space by the cavity wall insulation.

  • In winter this cavity wall insulation keeps the cold out.

  • Cavity wall insulation significantly reduces the energy consumption of such HVAC systems use to keep buildings at room temperature.

PolyWall Thicknesses & Thermal Insulation R-Values:

Board Thickness Thermal Insulation (R-Value)

40mm 1.143 (Recommended)
50mm 1.429 (Recommended)
75mm 2.145
100mm 2.857
120mm 3.429
150mm 4.286
200mm 5.714
300mm 8.571

Manufacture & Supply:

Our PolyWall Insulation Boards are manufactured locally in South Africa and distributed nationally from our regional factories in:

  • Johannesburg
  • Cape Town
  • Durban
  • East London
  • Port Elizabeth

We also export our polystyrene sheets, blocks and other products to certain countries in Africa, based on order volumes.

How Many Sheets Do I Need?

  • Each board is 3m2
  • To get the number of boards you need, simply divide the total wall insulation area in m2 by 3 to get the number of sheets
  • Then add a few for wastage.

Order Process:

  • First decide on the thickness you want. (The thicker the boards, the more insulation)
  • Add the boards and quantities you want to you order.
  • Select the collection & delivery options
  • Pay for your order online or submit your order for review.
  • Fast & Easy!

About Polystyrene Product Company (Pty) Ltd

Polystyrene Product Company, established nationally in South Africa in 2016, is a well known & respected bulk national supplier of polystyrene sheets, blocks, insulation, extruded polystyrene ceilings & void-formers in South Africa & for export.

Since 2016, we have supplied polystyrene to over 14000 customers nationally in South Africa, Botswana, Mozambique, Zambia, Zimbabwe & Mauritius. We have also supplied bulk polystyrene to many of the biggest construction projects in South Africa.

We are the #1 National Online Ordering Platform For Bulk Polystyrene In South Africa, making it easier and faster for architects, builders, bulk buyers & the general public to order polystyrene online in SA.

CO. Reg Number: 2016/072709/07

VAT Number: 4220273447

National Sales & Logistics (Johannesburg) 011 678 5626

Cape Town Sales 021 200 5926

Durban Sales 031 940 7056

East London & PE Sales 087 095 3259

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Let's Explore Your Green Building & Polystyrene Requirements Together!

Recent Projects Supplied

Cape Town Convention Center Extension Concrete Roof Insulation Project

1400m2 of 120mm Extra-High Density Concrete Roof Insulation (PolyRoof Insulation) Laid On Top Of Torch-On Waterproofing With Paving Overlay

Hydroboard Insulation_edited.jpg
PolyVoid - Structural Fill Blocks.jpg

Nelson Mandela Children's Hospital Raised Slab Project 

3000m2 of 50mm Extra-High Density Concrete PolyVoid Fillers To Raise An Existing Concrete Slab By 1m. Extra-High Density Polystyrene Has Incredible Compressive Strength Properties.


Polystyrene Product Company

Polystyrene Product Company Was Established In 2016 And Today It Is One Of The Leading National Suppliers Of Bulk Polystyrene To The Construction And Manufacturing Industries In South Africa And For Export.

National Sales & Head Office


Unit 8, Lower Ground Level, Commercial City, Tungsten Rd, Strydompark, Randburg, 2194

VAT Number: 4220273447

CO. Reg Number: 2016/072709/07

Main Office Number:

011 678 5626


Main Email: