Expol Platinum Board for Wall Insulation

EXPOL Platinum Board is a premium product for the insulation of timber and steel framed buildings. The addition of graphite to expanded polystyrene (EPS) creates a product that offers one of the most effective forms of interior insulation available.

Resistant to moisture, EXPOL Platinum Board is an excellent choice for wall cavities as it does not allow moisture to transfer from the exterior cladding to interior wall linings.

Where superior R-value, moisture resistance and flexible sizing is required, EXPOL Platinum Board is your best choice.  For a cost effective interior insulation, use EXPOL ThermaSlab SL.

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Wall Insulation

A premium wall insulation product for timber or steel framed buildings, EXPOL Platinum Board reduces heating and cooling costs and contributes to a comfortable interior living space.  The rigid foam composition of EXPOL Platinum Board ensures it will not slump or sag within wall cavities. Available in full sheets or easily cut to a specific size.

Other Applications

EXPOL Platinum Board is also suitable for use in masonry wall insulation, cladding insulation, concrete floor insulation and skillion roof insulation.


EXPOL Platinum Board is a lightweight expanded polystyrene (EPS) board that is easy to handle and install.  

An inert product, EPS does not degrade over time, meaning insulation performance is ensured for the life of the building.  At a thickness of 65mm, EXPOL Platinum Board delivers an R-value of 2.03.  

Compared to standard EPS, EXPOL Platinum Board uses fewer raw materials during processing without reducing insulation performance.  This makes EXPOL Platinum Board one of the most eco-efficient choices for insulation. 

The unique matrix structure of EXPOL Platinum Board gives exceptional rigidity and strength.  EXPOL Platinum Board has a well-regarded reputation as a reliable wall insulation product.  

For an economic choice for wall insulation, choose EXPOL ThermaSlab SL.




EXPOL Wireguard is a waxed paper strip that separates exposed electrical cables from EXPOL Platinum Board insulation.  An important part of the system, EXPOL Wireguard prevents the degrading effect that EPS can sometimes have on electrical cables over a prolonged period. 




EXPOL Platinum Board comes in various lengths at 1200mm wide.  Sheets can be cut to specific sizes.





How effective is EXPOL Platinum Board for thermal insulation?

Made of 98% trapped air, EPS demonstrates excellent thermal insulation properties. With added graphite, EXPOL Platinum Board gives even higher R-value than other EPS boards.

Is EXPOL Platinum Board durable?

The unique matrix structure of expanded polystyrene (EPS) creates block rigidity.  An inert, rigid foam product EPS does not settle over time, thus ensuring the R-value for the life of the building.

Does EXPOL Platinum Board 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.

Is EXPOL Platinum Board 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. 

Technical information



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 Expol Wall Insulation products which may be of interest

EXPOL Thermaslab SL Grade

Fast Facts
  • A premium expanded polystyrene wall insulation product, EXPOL Platinum Board will not sag, degrade or allow thermal loss over time.
  • A thin, lightweight board, EXPOL Platinum Board is fast and easy to install.
  • With the highest R-value of all of EXPOL’s EPS interior insulation products, EXPOL Platinum Board is an excellent choice for interior wall insulation.
  • EXPOL Platinum Board is one of the most eco-efficient choices for insulation, yet it does not compromise on performance.
  • The addition of graphite to the EPS gives EXPOL Platinum Board superior insulation and absorption performance.
  • Made of 98% air, EPS does not settle over time, thus ensuring the R-value for the life of the building.

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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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