EXPOL Platinum Board for Roof Insulation

EXPOL Platinum Board is a premium polystyrene insulation solution for narrow roof spaces, such as skillion roofs.

Specifiers and installers choose EXPOL Platinum Board for its superior R-value, relative to its thickness.

With the addition of graphite, EXPOL Platinum Board keeps buildings warm and dry by providing superior thermal protection.


Click to enlarge

Choose your thickness


Skillion Roof Insulation

EXPOL Platinum Board is a rigid foam insulation board that is ideally suited for use in narrow skillion roof spaces. Available in full sheets, EXPOL Platinum Board is a graphite-infused EPS board that is easily cut to fit purlin or rafter spacings.

Other Applications

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


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

An inert product, EPS does not degrade over time. Water resistance and thermal insulation performance is ensured for the life of the building. At a thickness of 30mm, EXPOL Platinum Board delivers an insulation R-value of .94.

Compared to high density EPS, 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 skillion roof 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 insulation product suitable for use in floors, walls and skillion roofs.

For an economic skillion roof insulation solution, choose EXPOL ThermaSlab.




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 supplies a water-based glue to adhere polystyrene to most surfaces. EXPOL Platinum Board insulation panels are glued in place using adhesive or can be used in combination with other fixing methods.



EXPOL Platinum Board comes in 1200mm lengths at various widths to suit your project.  Sheets can be cut to specific sizes.



All sizes above are examples of some standard situations
NOTE: Other widths available


EXPOL makes insulating easy. To ensure you get the best result, follow these simple steps.

Installing EXPOL Platinum Board

Ensure insulation is cut accurately to create a neat fit between the rafters or purlins.

It is important to ensure maximum insulation by using the correct thickness, as determined by the thickness of the rafters or purlins.

Check with the architect or specifier for required measurement for an air gap above the insulation.

Ensure there is no contact between the polystyrene and electrical wiring.


What’s the difference between EXPOL Platinum Board and EXPOL ThermaSlab?

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

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?

An inert, rigid foam product, EPS holds its shape and does not deteriorate with age. 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 give 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 skillion roof spaces 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 Skillion Roof Insulation products which may be of interest

EXPOL ThermaSlab S, M and H Grades

Fast Facts
  • EXPOL Platinum Board is the premium choice for creating warm, healthy homes.
  • A thin, lightweight board, EXPOL Platinum Board makes installation in narrow roof spaces fast and easy.
  • There is no need for ongoing maintenance as EXPOL Platinum Board does not sag, degrade or allow thermal loss over time.
  • Choose EXPOL Platinum Board for the highest possible R-value.
  • 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 EXPOL Platinum Board ensures superior thermal protection and absorption performance.

R-Value Calculator

Sheet Calculator

Area to be insulated

Product Size Required

  • Branz
  • Testing
  • Masterspec
  • Other
Click here

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

Thank you for visiting Expol. To view the site please upgrade to the latest version of Internet Explorer, Chrome or Firefox.

Links to update your browser:

Internet Explorer - http://windows.microsoft.com/en-NZ/internet-explorer/download-ie

Chrome - https://www.google.com/chrome/browser/features.html

Firefox - https://support.mozilla.org/en-US/kb/update-firefox-latest-version