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PolySlab – Polystyrene Slab Block Prices & Specials

PS-Johannesburg-110mm (20DV)-1200mm-25mm Lip x 65mm Cutout
Order polystyrene decking blocks for slab construction in JHB, CT, Durban, East London & Port Elizabeth. Now on special!
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Product Details
Brand: PolySlab
Product Type: Polystyrene Concrete Slab Void-Formers / Decking Blocks
Availability: Nationally In South Africa
Estimated Lead Time: Currently 3 to 7 Working Days
Fire Rating: B1
Applications: Rib & Block Concrete Slabs

Order Polystyrene Slab Blocks For Rib & Block Slab Construction

On Special Today!

(We Don't Design Concrete Slabs, Block Supply Only)

You can simply order online our request a quote now!

If you are looking for cost-effective Polystyrene Blocks for Rib And Blocks Slab Construction then you are definitely in the right place!

PolySlab Rib & Blocks Void Formers are a lightweight solution for slab construction, made with durable polystyrene foam. They are an equal alternative to traditional ash blocks which are extremely heavy. PolySlab Rib & Blocks Void Formers are easy to install and can be used in both residential and commercial applications. Their superior insulation properties make them an excellent choice for energy-efficient buildings.

We are leading national suppliers of Polystyrene Rib And Blocks Slab Blocks in South Africa and you can simply order them online here for collection our delivery from our collection & delivery factories & depots 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.

Polystyrene Rib And Block Design Sizes & Dimension Details:

  • All our polystyrene rib and block slab blocks are 1200mm long in dimension and vary in thickness based on your engineer's rib and block design & specification.
  • Below you will see all our polystyrene rib and block thicknesses and recommended thicknesses based on the concrete slab thickness.
  • If you need specific custom-cut polystyrene rib and block slab sizes and dimensions please let us know.

Estimated PolySlab Thicknesses Based On Concrete Slab Thicknesses

  • Concrete slabs have to be designed and inspected by qualified engineers to ensure that the design loads of the slab meet the design of the concrete slabs.
  • Consult with your engineers to determine if these blocks are suitable based on your slab design and slab loading requirements.
  • Your engineer will specify the thickness of the blocks required.
  • We will not supply PolySlabs to consumers unless they provide proof that an engineer has done a proper design.

Final Concrete Slab Thickness PolySlab Block Thickness
170mm 110mm
200mm 150mm
255mm 190mm
300mm 230mm
340mm 285mm

PolySlab Design Properties

  • Your engineer can use these properties to finalise your concrete slab design.

Density Compressive Strength Cross-Breaking Strength
X-Grade 60 kPa @ 10% compression 80 kPa @ 1% compression
20DV 110 kPa @ 10% compression 150 kPa @ 1% compression

PolySlab Online Prices:

  • Our Polystyrene Rib & Block Slab Void-Formers Prices are block prices including VAT.
  • If you order is over 1000m2 then we can discuss a better rate.

PolySlab - Rib & Block Void Former Or Decking Blocks

  • PolySlab Blocks are expanded polystyrene decking blocks or void formers used in rib & block slab construction.
  • PolySlab Blocks are used instead of traditional ash blocks and they are placed between the concrete lintels to create a base on which the final concrete slab can be cast.

Benefits of using PolySlab Blocks instead of Ash Blocks

  • PolySlab Blocks are lightweight and easy to lift in multi-story building projects.
  • They significantly reduce they final weight of the concrete slab.
  • They increase the rate at which concrete slabs can be prepared and constructed.
  • Lightweight slabs reduce the amount of jacking supports required and the time that such supports need to remain in place.
  • This means that work can resume faster during the curing period of the concrete slab.
  • They increase the thermal and acoustic properties of the concrete slab.

Order Process:

  • Select the closes distribution Centre to your project.
  • Add the products and quantities you want to you order.
  • Add collection or delivery if available
  • Simply order online or submit your order to us for review.
  • Fast & easy!

Online & Offline Payment Methods

Our Payfast Secure Encrypted Online Payment Gateway allows our customers to pay directly online using any of the following cards or options:

  • Visa Credit Cards & Debit Cards
  • Mastercard Credit Cards & Debit Cards
  • Makro Store Cards
  • Builders Warehouse Store Cards
  • Game Store Cards
  • Cape Union Mart Store Cards
  • CTM Store Cards
  • RCS Store Cards & More
  • Instant Online EFT Payment

Alternatively you can order online and request an invoice for normal EFT payment.

Request A Quote

If you prefer a quote, please follow the button link below.

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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#1 Google Reviewed, Bulk, National, Polystyrene Supplier In South Africa

Since 2016, We Remain Most & Highest Google Customer Reviewed, Bulk, National, Direct, Polystyrene Supplier In South Africa. 


Recent Delivery Locations


Landmark Bulk Polystyrene Projects Supplied

Since, 2016, we have worked closely with many of South Africa's largest construction companies and supplied polystyrene to several of the landmark polystyrene building projects nationally and to neighboring countries. Some of these include:

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

Polystyrene Insulation - Cape Town Convention Centre / Polyroof
PolyVoid - Structural Fill Blocks

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.

About Polystyrene Product Company (Pty) Ltd

About Us

Why Polystyrene Product Company (Pty) Ltd

Established Nationally in 2016

Highest Google Reviewed Supplier

Anybody Can Order Direct

Respected Bulk Suppliers

Suppliers To Many Bulk Buyers

Polystyrene Specialists

Technical Experts

High Quality Products

Direct From Factory

Fast Ordering Platform

Well Known

Competitively Priced


No Minimum Orders

Over 35000 Facebook Followers

Polystyrene Order Lead Times

We Cut Hundreds Of Orders, Nationally In South Africa, Every Day.


We Cut On A First-Come-First-Serve Basis So The Faster You Place Your Order The Faster It Will Get Cut.


For Cutting & Collection

 3 - 5 Working Days, Excl. Weekends

For Cutting, Collection & Delivery

3 – 7 Working Days, Excl. Weekends


We May Also Have Stock On The Floor. You Will Have To Call Us To Make Arrangements

Office Hours: Monday - Friday 8am - 5pm

Online / Offline Payment Options

You Can Order Online & Request An Invoice To Pay Via Normal EFT

You Can Order Online & Pay Via:


  • Visa Credit & Debit Cards

  • Mastercard Credit & Debit Cards

  • Builders Warehouse Store Cards

  • RCS Store Cards

  • Game Store Cards

  • Cape Union Mart Store Cards

  • Makro Store Cards

  • CTM Store Cards & More

  • Instant EFT (Online)

Polystyrene Cutting &  Distribution

All National Client Orders Are Managed Centrally & Not Through Our Regional Factories.


We Cut & Deliver Polystyrene Nationally Directly From Our Cutting Facilities In:


Cape Town


East London

Port Elizabeth


We Cut, Deliver & Offer Collection At These Facilities.


Our Online Ordering Platform Deals With Local Deliveries. Call If You Don't Find A Delivery Option.

Bulk Buyer & Regular Buyer Polystyrene Quotes


Bulk Buyers or Regular Buyers will most likely qualify for bulk discounted rates based on order volumes. Please Explore Our Product Catalogue Above Before you complete our Product Specific Online Quote Forms below.

Our Quote Forms Can Take A Little Time To Load & Display.

Polystyrene Product Company

Your Trusted Specialists In Bulk Polystyrene For Concrete Floor Insulation, Cavity Wall Insulation, Concrete Roof Insulation, Thermal Ceilings & Void-Former Applications

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:

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