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EXPOL ThermaSlab (EPS – Expanded Polystyrene Sheet)  provides excellent compressive strength, moisture resistance, and thermal protection.

Ideally suited for residential applications, EXPOL ThermaSlab (EPS – Expanded Polystyrene Sheet) is cost effective, easy to install insulation solutions that achieve R-values above building regulations.

Made from environmentally sound EPS – Expanded Polystyrene, EXPOL ThermaSlab Polystyrene Sheet will protect a building from heat loss through the concrete slab.  The result is a warm, dry, healthy home that costs less to heat and cool.

EXPOL ThermaSlab (EPS – Expanded Polystyrene Sheet)  is a lightweight polystyrene board that does not compromise on insulation performance.  At a thickness of 50mm, EXPOL ThermaSlab S delivers an R-value of 1.32 and ThermaSlab H delivers an R-Value of 1.39.

An exceptionally durable product, EXPOL ThermaSlab (EPS – Expanded Polystyrene Sheet) does not require maintenance or replacement. Thermal performance, water resistance, and compressive strength will last for the life of the building. EXPOL’s expanded polystyrene insulation does not decay or rot, won’t support a fire and has no nutritional value to termites or rodents.

EXPOL ThermaSlab (EPS – Expanded Polystyrene Sheet) ) is easy to cut and comes in a range of sizes, making the installation process efficient.

To see how EXPOL Concrete Floor Insulation products are integrated into the new Building Code Changes introduced 1 May 2023 please see the EXPOL FLOOR / SLAB INSULATION CALCULATOR

EXPOL ThermaSlab Sheets

EXPOL New Generation - Superior Performance

EXPOL Performance that meets & exceeds the new insulation standards

EXPOL Masonry Wall Insulation

EXPOL Retaining Wall Protection

Cladding Insulation

EXPOL Exterior Wall Cladding/Insulation

EXPOL ThermaSlab S Grade (EPS – Expanded Polystyrene) contains recycled content and can be easily recycled.



The benefits:

  • Economical choice to achieve Building Code requirements
  • Lightweight
  • Long lasting
  • Water resistance
  • Easy to cut
  • Tested and approved for use in EIFS cladding systems
  • Available in various thicknesses and grades to suit usage
  • Solutions to achieve R-values above building regulations in both residential and commercial applications under concrete slab


All products and grades of Expanded Polystyrene supplied by EXPOL for retaining walls, concrete floors, pod floors, skillion roofs, cladding insulation, wall insulation, lightweight fill comply with manufacturing standard AS 1366 Part 3 1992.

ThermaSlab solutions and recommended grades S, M, H, VH and SL to use for:

   Retaining Walls ThermaSlab S Grade

EXPOL ThermaSlab

   Skillion Roof Insulation ThermSlab S,M,H Grades

EXPOL ThermaSlab

   Concrete Floor Insulation ThermSlab S,H,VH Grades

EXPOL ThermaSlab

   Wall Insulation ThermaSlab SL Grade

EXPOL ThermaSlab

   Cladding Insulation ThermaSlab S,H Grades

EXPOL ThermaSlab

Product Properties

Refer to the solutions above for recommended VH, H, S Grades of ThermaSlab.
To enlarge table information click table. 

EXPOL ThermaSlab


What is R-Value?

An R-Value is a rating which measures how well insulation can resist heat flow. ‘R’ stands for thermal resistance.

  • R-Value level depends on a number of things such as the type
    of material, its density and thickness.
  • Higher R-Value = Better insulation.

What is the difference between EXPO ThermaSlab and EXPOL Platinum Board?

EXPOL ThermaSlab is a cost effective way to insulate a building and meet Building Code requirements. EXPOL Platinum Board is a premium product with superior R-value.

Does ThermaSlab SL come in a range of different sizes?

Yes.  EXPOL ThermaSlab SL Grade is available in any width. Sheets of 355mm or 555mm at a length of 1200mm are most common.  It is also available in custom sizes upon request.

How strong is EXPOL ThermaSlab?

The unique matrix structure of expanded polystyrene (EPS) creates block rigidity making it an excellent choice for retaining walls as it will not sag or slump over time.

Can I use the ThermaSlab H Grade under the footing ?

No if you want to insulate under the footing you will need to use SLABX200 or EXPOL-X (XPS).

Can I insulate the edges of the footings?

Yes you will need to use SLABX200 or EXPOL-X (XPS) 30mm, 40mm or 50mm for the the sides and under the footings.

Does the ThermaSlab go under the polythene?

No the ThermaSlab must be laid on top of the polythene.

Is EXPOL ThermaSlab water resistand?

The closed cell construction of expanded polystyrene (EPS) ensures it resists any adverse effects of water

What sizes does EXPOL ThermaSlab come in?

EXPOL ThermaSlab comes in lengths of 2400mm, 2450mm, 2700mm, 3600mm and 4800mm in various thicknesses.  Custom sizes are available upon request.

Does EXPOL ThermaSlab help with drainage?

No. EXPOL ThermaSlab is not a drainage material.  Use EXPOL StyroDrain for a lightweight solution for retaining wall drainage.







EXPOL Technical Product Guide


Building Product information Sheet



Technical Data Sheet

EXPOL ThermaSlab SL Grade


Technical Data Sheet

EXPOL ThermaSlab S Grade


Technical Data Sheet

EXPOL ThermaSlab M Grade


Technical Data Sheet

EXPOL ThermaSlab H Grade


Technical Data Sheet

EXPOL ThermaSlab VH Grade


EXPOL products are available at a number of leading building products stores. Find your nearest stockist here.

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