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ThermaSlab Edge is EXPOL’s new generation Slab Edge Insulation System specifically designed to meet new Building Code standards for Concrete Slab Insulation.

ThermaSlab Edge is suitable for retrofit applications. Specifically, engineered for residential and commercial projects, it’s high performance gives engineers and specifiers peace of mind while increasing the thermal performance of the building.

ThermaSlab Edge’s durable nature means it will not degrade over time, keeping its integrity for the life of the structure.



EXPOL New Generation - Superior Performance

EXPOL Performance that meets & exceeds the new insulation standards

EXPOL ThermaSlab Edge Product Of Choice

EXPOL ThermaSlab Edge Product of choice

EXPOL ThermaSlab Edge

EXPOL ThermaSlab Edge

EXPOL ThermaSlab Edge - 300mm Pack

EXPOL ThermaSlab Edge - 400mm Pack


With a water-proof resin coating that does not require painting, saving time and money.


ThermaSlab Edge is also available as clean insulation, requiring plastering after the concrete pour.

The benefits:

  • Increases the thermal performance of a building
  • A simple, cost-effective slab edge insulation system
  • Designed to meet new H1 standards
  • No painting required, saving time and money
  • Exceptional insulation values
  • High water resistance
  • Lightweight and easy to handle

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


Download EXPOL ThermaSlab Edge Brochure

Download Concrete Floor Solutions Guide

It is used as an insulation solution for floor slab systems:

   Pod Floor Systems EXPOL Tuff Pod

ThermaSlab Edge Technical Specifications

Sheet Sizes (mm)

How to Specify

  • Ask your engineer to add EXPOL ThermaSlab Edge to their designs
  • Talk to our Tech Team about your project planning
  • Visit below for DWG or PDF files

Architects / Specifiers Downloads


Download PDF


Download DWG – cad file


ThermaSlab Edge – Profile Details PDF


Please read entire set of instructions before starting.

Ensure surfaces are clean and free from dust, oil and grease.

To assist you, we’ve developed an easy step guide and download pdf – follow it and you can’t go wrong.

Installation and Safety Instructions

Some useful tools for installation

Bonding panels with StyroFix Adhesive

Step 1

Cut the nozzle of the StyroFIX cartridge to allow for a 5mm bead.

Step 2

Try and work quickly from this point forward. On the back-side of the ThermaSlab Edge apply a bead of StyroFIX the whole way along the top edge of the ThermaSlab Edge.

Step 3

Apply a bead of StyroFIX in a wavy line the whole length of the board as shown. The frequency between each wave of adhesive shall be not less than 125mm apart, be sure to make good coverage.

The ratio is one tube of StyroFIX for each ThermaSlab Edge panel.

Step 4

Apply ThermaSlab Edge to the desired area of the slab edge and apply firm even pressure to board.

Step 5

Remove the ThermaSlab Edge panel from the wall and place down carefully, let sit for one minute – this is to allow a reaction to happen in the StyroFIX which will make it tackier and allow the two surfaces to bond better.

Step 6

Place the ThermaSlab Edge panel back in the desired position – be careful with this placement as depending on conditions the board could be very hard to move once this placement has been made.

Step 7

Support and brace the panel until the StyroFIX cures.

Using EXPOL Patch-Kit

Use the EXPOL Patch-Kit to cover joins and make repairs to your ThermaSlab Edge or MAXEdge Insulation.

EXPOL Polystyrene Insulation is coated with our 100% water-based, water-proof resin and recycled glass aggregate, kiln dried between coats.

A three-coat acrylic paint finish can be applied to finished products.

A light weight, solid concrete look developed for New Zealand conditions.

Please read instructions before use. Do not handle until all safety precautions have been read and understood.


  • Do not breathe vapours
  • Avoid contact with eyes, skin and clothing
  • Use personal protective equipment when handling
  • Contain spills immediately with inert materials (e.g. sand)
  • Keep spills and cleaning run off from entering sewers and drains
  • Wash hands thoroughly after handling
  • Keep containers tightly closed at all times
  • Store in a well-ventilated space



  1. Ensure the surface of the insulation is clean and dry where EXPOL Patch-Kit is to be used.
  2. If there are any large gaps between panels of more than 3mm these will need to filled with an MS sealant such as Sikaflex MS or Bostik MS Safe Seal.
  3. Thoroughly mix the EXPOL Patch-Kit compound until it reaches an even consistency.


  1. Apply the compound liberally to joins or areas that need repair with a metal broadknife or similar.
  2. Use the uncoated side of a piece of ThermaSlab Edge or MAXEdge board to rub over the freshly applied area, use circular motions and apply pressure until area looks smooth and uniform.
  3.  Leave to dry.
  4. The compound will look much darker than the original coating but will cure to the same colour over time

EXPOL Patch-Kit compound can be reconstituted long after initial use. If you need to make repairs down the line and you find your Patch-Kit has dried out simply add a small amount of water while mixing until reaching the original consistency

Response Statements:

If exposed or concerned: Seek medical attention

Composition / Information on ingredients

CAS NO. COMPONENT CONCENTRATION Monoisobutyrate, Quartz < 7

Balance of ingredients: Non-hazardous or below hazardous threshold

System Components

EXPOL Patch-Kit

A 4 litre pail of our water-based, water-proof resin coating suitable for patching joins.

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.


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.

Does EXPOL ThermaSlab Edge come coated and uncoated?

ThermaSlab Edge is available both:

  • Coated with a water-proof resin coating that does not require painting, saving time and money.
  • Uncoated / as clean insulation, requiring plastering after the concrete pour.

Does EXPOL ThermaSlab Edge come in different heights?

EXPOL ThermaSlab Edge is available in two different sheet sizes:

  • 2500x30x300mm
  • 2500x30x400mm

How many sheets of ThermaSlab Edge (Coated) are in a pack?

There are:

  • 5 lengths in the 2500x30x300mm pack
  • 4 lengths in the 2500x30x400mm pack

How many sheets of ThermaSlab Edge (Uncoated) are in a pack?

ThermaSlab Edge (Uncoated) is available for purchase in individual lengths of 2500mm

What system components will I need?

We recommend the use of:

  • Styro-FIX Construction Adhesive (1 tube per sheet of ThermaSlab Edge)
  • EXPOL Patch Kit to patch over joins

How do I install ThermaSlab Edge?

Detailed instructions are above.

How many tubes of Styro-FIX will I need?

We recommend using one tube of Styro-FIX per length of ThermaSlab Edge.

Does EXPOL ThermaSlab Edge (Coated) require painting?

No, EXPOL ThermaSlab Edge (Coated) is waterproof and does not require painting. A three-coat acrylic paint finish can be applied to finished products, if desired.

What is the difference between EXPOL ThermaSlab Edge and MAXEdge?

EXPOL ThermaSlab Edge is specifically designed for retrofit slab edge insulation, whereas MAXEdge is specifically designed for in-situ slab edge insulation.

Is ThermaSlab Edge suitable for both slab-on-grade and rib-raft slabs?

Yes, ThermaSlab Edge can be used for both slab types.

Is there an in-situ option available?

Yes – to find out more about MAXEdge, our in-situ Slab Edge Insulation click here.

Is EXPOL ThermaSlab Edge water resistant?

Yes, the water-based coating on EXPOL ThermaSlab Edge is waterproof.

How do I patch up joins or repair damaged areas of EXPOL ThermaSlab Edge?

We recommend use of the EXPOL Patch Kit to patch over joins or repair any damage that occurs during installation.

Where can I purchase EXPOL ThermaSlab Edge from?

Mitre 10, Bunnings, Carters, ITM, PlaceMakers, BuildLink and other Nationwide hardware outlets.

Click here to visit the stockist page.



EXPOL Technical Product Guide

Technical Data Sheet

EXPOL ThermaSlab Edge

Building Product Information Sheet

EXPOL ThermaSlab Edge

EXPOL ThermaSlab Edge Installation and Safety Instructions


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

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