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EXPOL’s New Generation, high performance insulation range is consciously designed and engineered to meet the new Building Code Standards on 1 May, 2023.

Our goal is to reduce our carbon footprint and deliver dryer, warmer, healthier and environmentally friendly spaces.

Made from white Expanded Polystyrene that contains recycled content it is 1200mm in length, 100mm thick and manufactured in four standard widths 360, 410, 470, 560.

It is the ideal solution for normal New Zealand suburban environments or rural areas which do not have extreme temperatures. EXPOL R2.5 contains recycled content and can be recycled.

Complete with an EXPOL 50 Year Product Warranty which gives you the satisfaction of knowing that you will have a warmer, drier, healthier home in winter.

EXPOL UnderFloor Insulation is available from participating hardware stores nationwide – find your local outlet here.

EXPOL New Generation - Superior Performance

EXPOL Performance that meets & exceeds the new insulation standards

EXPOL R2.5 Premium UnderFloor Panel 100mm

EXPOL UnderFloor Insulation - R2.5 Premium Panel installed showing EXPOL Z Clips to secure panel.

EXPOL R2.5 Premium UnderFloor Insulation - 360

EXPOL R2.5 Premium UnderFloor Insulation - 460

EXPOL R2.5 Premium UnderFloor Insulation - 470

EXPOL R2.5 Premium UnderFloor Insulation - 560


We provide a 50-year warranty on our UnderFloor Products
Full details:

EXPOL UnderFloor R2.5 White Insulation has a BRANZ appraisal.

See BRANZ certificate number 256.

EXPOL UnderFloor R2.5 Insulation contains recycled content and can be easily recycled.

The benefits:

  • Easy to install
  • Concertina edges which allow for compression of up to 20 mm to create a tight fit
  • Contains recycled content and can be easily recycled
  • Flame retardant
  • Rigid
  • Resistant to moisture
  • No nutritional value to vermin, birds or animals
  • Ideal for both retro-fit applications and new floors
  • EXPOL 50 Year Product Warranty

All EXPOL timber floor insulation solutions comply with the Australian and New Zealand Standard AS/NZS 4859.1:2002.

All panels have a yellow stripe down one edge to confirm compliance with manufacturing standard AS 1366 Part 3 1992 for SL grade.

It is used as an insulation solution for:

   Timber UnderFloor



Underfloor 2.5 & 3.1

Panel Sizes

EXPOL White R2.5 Underfloor Insulation

Product Properties

EXPOL Underfloor Insulation



EXPOL Installation Components


There are two types of fixings specific to existing floors and new floors. They are made from non-corrosive nylon and are used to fix the EXPOL panels in place.

  • Existing Floors: EXPOL Z Clips are designed as a push fit between the panel and the joist.
  • New Floors: EXPOL Joist Saddles for R2.5 & R3.1 (extended length) are designed to slip over the joist to support and secure the 100mm panel. 
EXPOL Wireguard

EXPOL WireGuard

EXPOL WireGuard  a waxed paper strip to separate exposed electrical cables from the EXPOL insulation. Expanded Polystyrene in some cases reacts with the plasticiser and degrades the elastic properties of some electrical cables over a prolonged period.

EXPOL Styro-Fix Construction Adhesive

Styro-FIX Construction Adhesive

Styro–FIX is an advanced single component polyurethane-based construction adhesive.

This powerful adhesive is developed especially for the construction industry and will bond most types of construction materials including timber (damp and dry), concrete, plasterboard, polystyrene and many other porous and non-porous substrates.

It bonds expanded polystyrene to most surfaces, delivers strong adhesion and rapid cure, it is gun-able and non-drip.



EXPOL Technical Product Guide


EXPOL R2.5 & R3.1 UnderFloor Brochure


Technical Data Sheet

EXPOL 2.5 UnderFloor Insulation


Building Product Information Sheet

EXPOL Timber UnderFloor Insulation

Where To Buy EXPOL


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

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