National Sales Support
JHB Head Office
Order Thermal,
PolyRoof -Polystyrene Insulation Boards, For
Above Concrete Roof Slabs,
Nationally & For
Export
Upgrade your roof with PolyRoof polystyrene insulation boards—lightweight, moisture-resistant, and built for lasting thermal performance. Ideal for concrete roofs, they’re easy to install and help cut energy costs while keeping buildings cooler and protected.
Order Lead Time:
Generally 3 to 5 working days excluding weekends and public holidays. If you need it faster, please let us know so we can assist.
PolyRoof - Polystyrene Concrete Roof Insulation Boards
Detailed Product Overview
Insulate and protect your flat roof with POLYROOF Insulation Boards, made from high-density or extra-high-density expanded polystyrene (EPS).
POLYROOF Insulation Boards provide superior thermal performance to help you meet the roof insulation requirements set out in SANS 10400, Part XA, ensuring energy-efficient, comfortable, and code-compliant buildings.
Installed above the waterproofing membrane and topped with a bidim filter fabric and stone ballast, this inverted roof system shields the waterproofing membrane from UV, heat, and damage—extending its lifespan and reducing maintenance costs.
POLYROOF offers exceptional thermal insulation, is more cost-effective than XPS, and helps stabilise indoor temperatures year-round.
SANS 10400-XA compliant and EPSASA approved, these boards are lightweight, moisture-resistant, and built for long-term performance in residential and commercial buildings.
POLYROOF Insulation Boards are trusted by architects, engineers, and waterproofing companies for their superior durability, thermal performance, and cost-effectiveness in inverted roof insulation systems.
They are a very compitively priced against extruded polystyrene (XPS) and rigid polyisocyanurate (PIR) foam options.
Ideal For:
• Inverted roof insulation systems
• Flat concrete roof slabs
• Protection of waterproofing membranes
• Use with bidim filter fabric and stone ballast
• Cost-effective alternative to XPS
• Residential, commercial, and industrial buildings
Key Product Benefits
POLYROOF Insulation Boards provide superior thermal performance to help you meet the roof insulation requirements set out in SANS 10400, Part XA, ensuring energy-efficient, comfortable, and code-compliant buildings.
Made from high-density and extra-high-density expanded polystyrene (EPS) for superior strength and durability
Designed specifically for inverted roof systems, placed above waterproofing membranes
Shields waterproofing membrane from UV, heat, and mechanical damage, extending its lifespan and lowering maintenance costs
Provides excellent thermal insulation, reducing temperature fluctuations inside buildings
More cost-effective alternative to extruded polystyrene (XPS) and polyisocyanurate (PIR) foam options
Lightweight, moisture-resistant, and easy to handle and install
Available in varius thicknesses that have differentthermal R-values
EPSASA - (Expanded Polystyrene Assiciation Of South Africa) approved for application suitability and quality assurance
Trusted by architects, engineers, and waterproofing companies
Suitable for residential, commercial, and industrial flat roofs
Available nationally and exported internationally
Thermal Insulation Values
Understanding thermal insulation values is essential when designing and specifying building insulation.
POLYROOF expanded polystyrene insulation boards have a K-value of 0.035 W/m·K, providing excellent thermal resistance to reduce heat transfer through roof slabs.
Thermal R-values are calculated by dividing the thickness of the material (in meters) by its K-value, so by adjusting thickness, you can achieve the required thermal performance for your project.
Below are typical POLYROOF Thermal R-values by thickness:
30mm — 0.857
35mm — 1.000
40mm — 1.143
50mm — 1.429
60mm — 1.714
70mm — 2.000
80mm — 2.286
90mm — 2.571
100mm — 2.857
110mm — 3.143
120mm — 3.429
150mm — 4.286
Real-World Application Example
To meet strict energy efficiency standards, 125mm thick high-density POLYROOF insulation boards were installed on the Cape Town International Convention Centre (CTICC) Roof Extension project. This provided a thermal R-value of 3.570, exceeding the minimum requirement set out by SANS 10400, Part XA.
This installation showcases how POLYROOF can be specified with confidence on high-profile commercial developments, delivering both compliance and long-term performance.
Where Do We Manufacture This?
Johannesburg
Cape Town
Durban
Port Elizabeth
Do We Keep Stock?
We keep some stock in our Johannesburg Warehouse. Check with our sales team.
In Cape Town, Durban and Port Elizabeth, we cut our polystyrene on order.
Where Will You Deliver This To?
Locally, Nationally & Internationally depending on the size of the order.
We won't deliver small orders long distances, but call us to enquire.
Can I Collect This Product?
We only offer collection from our Strydompark warehouse in Randburg, Gauteng.
We don't offer collection in:
Cape Town
Durban
Port Elizabeth
Current Lead Times
Generally 3 to 5 working days excluding weekends and public holidays. If you need it faster, please let us know so we can assist.
Polystyrene Density
We manufacture this product in the following densities:
High (20 & 24 kg/m3)
Extra High (30 kg/m3)
Polystyrene Insulation Dimensions
Our standard board sizes by thickness (mm) x width (mm) x length (mm) are:
30mmx 1200mm x 2500mm
40mm x 1200mm x 2500mm
50mm x 1200mm x 2500mm
75mm x 1200mm x 2500mm
100mm x 1200mm x 2500mm
125mm x 1200mm x 2500mm
150mm x 1200mm x 2500mm
200mm x 1200mm x 2500mm
300mm x 1200mm x 2500mm
600mm x 1200mm x 2500mm
Why Choose
Us?
+17500
National Polystyrene Orders Delivered Since
2016
+37254
Dedicated Facebook Followers
Highest & Most Google Reviewed National Polystyrene Supplier In South Africa
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Polystyrene Product Company
Where Builders & Bulk Buyers Order Bulk Polystyrene Direct, Nationally, In South Africa
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
National Head Office Number:
011 678 5626
Main Email: sales@polystyrene.co.za