EXPOL ThermaSlab S and H Grades for Cladding Insulation

EXPOL ThermaSlab is the easiest way to achieve a warm, dry, healthy home, from the outside in.

It is a high performing cladding insulation solution that is approved for use in exterior insulation finishing systems (EIFS).

Tested for durability, EXPOL ThermaSlab is a solid expanded polystyrene (EPS) product that satisfies the requirements for use in EIFS.

EXPOL ThermaSlab has been kiln dried and stabilised to ensure that it will not shrink or sag over the life of the building.

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Cladding Insulation

EXPOL ThermaSlab is an expanded polystyrene sheet approved for use in exterior insulation finishing systems (EIFS).  The rigid foam composition of EXPOL ThermaSlab ensures it will not slump or sag within wall cavities through thermal gaps. Available in a range of sizes, EXPOL ThermaSlab is also available in custom sizes.

For a premium solution that offers superior R-value, use EXPOL Platinum Board.  For an extruded polystyrene solution for cladding, use EXPOL-X for high compression strength.

Other Applications

EXPOL ThermaSlab is also suitable for use in concrete slab insulation, retaining wall insulation, wall insulation and skillion roof insulation.



EXPOL supplies a range of polystyrene batten sizes to suit all cladding systems.



EXPOL supplies 40mm plastic washers designed to increase the surface area of nail fixings.



EXPOL supplies a water-based glue to adhere polystyrene to most surfaces. EXPOL ThermaSlab cladding insulation is glued in place using this adhesive or can be used in combination with other fixing methods. 


Up to 30% of a building’s heat is lost through the walls.  A building insulated with an EXPOL ThermaSlab cladding system ensures comfortable, healthy living spaces.

Made from durable, lightweight expanded polystyrene, EXPOL ThermaSlab enhances any building by keeping it cool in summer and warm in winter.

The cellular structure of EXPOL ThermaSlab gives it excellent water resistance and thermal insulation properties.

An exceptionally durable product, EXPOL ThermaSlab does not require maintenance or replacement. Thermal performance and resistance to moisture and water will last for the life of the building. EXPOL’s expanded polystyrene insulation does not decay or rot and has no nutritional value to termites or rodents.

EXPOL ThermaSlab is easy to cut and comes in a range of sizes making the installation process fast and efficient.  

EXPOL supplies EXPOL Platinum Board for a premium cladding insulation solution.



EXPOL ThermaSlab comes in five lengths at 1200mm wide.  Special sizes are available on request.



Technical information



What’s the difference between EXPOL 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.

How strong is EXPOL ThermaSlab?

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

Is EXPOL ThermaSlab water resistant?

The closed cell construction of expanded polystyrene (EPS) ensures it resists any adverse effects of water. EPS board in wall cavities holds its shape, structure and thermal properties for the life of the building. 

Does EXPOL ThermaSlab come in a range of sizes?

Yes.  EXPOL ThermaSlab is available in widths of 355mm and 555mm at a length of 1200mm.  It is also available in custom sizes upon request.

Is EXPOL ThermaSlab environmentally friendly?

Made from 98% trapped air, EXPOL ThermaSlab requires very little raw material for manufacture making it so efficient that it will save up to 200 times its own resource in energy savings.  All EXPOL expanded polystyrene (EPS) products are 100% recyclable.  EXPOL runs one of New Zealand’s largest EPS recycling plants.

Does EXPOL ThermaSlab give off toxic fumes?

In the event of a fire, the level of toxicity of EPS is no greater than timber.  EPS does not off-gas hydrogen cyanide or hydrogen chloride.  No CFCs or HCFCs are used in the manufacture of EXPOL Platinum Board.


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

View Expol Distributors in a larger map

Other Cladding products which may be of interest

EXPOL Platinum Board


Fast Facts
  • EXPOL ThermaSlab is tested and approved for use in EIFS.
  • A thin, lightweight board, EXPOL ThermaSlab is easy to install by a tradesman or handyman.
  • Extremely durable, EXPOL ThermaSlab does not allow thermal gaps by sagging or slumping over time.
  • EXPOL’s expanded polystyrene insulation boards significantly improve the energy efficiency of a home requiring less drain on resources for heating and cooling.
  • EXPOL ThermaSlab does not require maintenance for the life of the building, as it is resistant to moisture, rot and pests.
  • EXPOL manufactures EXPOL ThermaSlab polystyrene boards throughout New Zealand, ensuring quick and easy delivery to site.

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Enquiry Form

General Enquiry

Tel: +64 (9) 634 3449

Free Phone: 0800 86 33 73


105 Captain Springs Rd., Onehunga, Auckland

Tel: +64 (9) 634 3449

Free Phone: 0800 86 33 73


105 Captain Springs Rd., Onehunga, Auckland

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