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Under Slab Soffit Insulation

Under Slab Soffit insulation is essential for commercial building applications.  Solartex can provide superior under slab rigid board systems and install them professionally to meet current  BCA Section J requirements.
Solartex supplies and installs a comprehensive range of both thermal and acoustic  products which are designed specifically for commercial under slab soffit insulation applications:


  Polyiso is a closed-cell, rigid foam board insulation used primarily on Concrete soffits, roofs and walls of offices, schools, carparks, health facilities, warehouses, retail and industrial manufacturing facilities. This product comes in thicknesses of 25, 30, 40, 50, 60, 75, 80, 90 and 100mm.    Custom Thickness and R values are available
POLYISOBOARD PIR White Finish has been developed to provide a bright, clean interior finish system for exposed soffits and car parks and masonry concrete walls.

is a closed-cell, rigid foam insulation board that has a glass fibre reinforced polyisocyanurate foam core  sandwiched between two faces a reflective foil   white acrylic coated aluminium on one side and 1mil smooth aluminium on the other. with  a moisture-resistant foam core.
White laminate finish resist damages, pressure-washable, provide attractive finish, improves light reflectance   in undercover car parks providing safer zones 

  • The most thermally efficient rigid board insulation available in the marketplace - it has the highest R-value per cm of thickness   Long Term R-value
  • Compatibility with most solvents used in construction adhesives.
  • Excellent dimensional stability
  • Group 1 product (fire rating)
  • Superior performance in fire tests - Polyiso meets the strict standard of both FM Class 1 Approvals (FM 4450/4470), UL 1256, and CAN/ULC S126M 
  • Environmentally friendly. A CFC- and HCFC-free product with zero ozone depletion potential. M anufactured with hydr o carbon blowing agents which have no ozone depletion potential.
  • Availability throughout Australia.
  • Available in Black, White and Foil finishes


 Soffit Board combines an Aluminium Reflective Foil faced to a rigid high value closed cell insulation foam.  This product comes in thicknesses of 25, 30, 40, 50, 60, 70, 80, 90 and 100mm.  The  Soffit Board has high R Values from R1.2 at 25mm through to R5.0 at 100mm. 
It is a Group 1 material as per part C.1.10A of the BCA (Part 3, Walls and Ceilings).
Soffit Board is a lightweight and durable insulation panel which is easy to handle and quick to install.  Solartex uses high quality insulation washers and fasteners as an effective method of installing the  Soffit Board.


ReflectaPanelis an aluminium reflective foil faced rigid EPS (expanded polystyrene) insulation board ideal for under slab applications.  ReflectaPanel is available in 10, 15, 20 and 25mm thicknesses and offers high R Values depending upon application.
ReflectaPanel is a lightweight, durable insulation panel which is easy to cut, handle and quick to install.  Reflcetapanel boards can be fixed with adhesive or insulation washers and fasteners.  All joins must be tape sealed and the surface can be painted or have the bright shiny aluminium surface facing downward.

Solartex Soffit Installation Projects 2010-2016 include

  • Lipman, The Woolstores, Alexandria, Sydney - 1400m2 - Kingspan Kooltherm K10
  • Prime Build Pty Ltd - Warilla Grove Shopping Centre, Warilla - 500m2 - Polyisoboard
  • Prime Build Pty Ltd - Aldi, Campbelltown Mall - 1300m2 - Soffit Insulation Kingspan Kooltherm K10
  • M+W Cockram, Global Switch Sydney East Project, Pyrmont - 650m2 - Soffit Insulation Polyisoboard
  • Deicorp  3000m2- Stryreflex reflectapanel
  • Thiess, Royal North Shore Hospital, St Leonards, Sydney - 17,000m2 - Kingspan Kooltherm K10
  • Bovis Lend Lease, No 1 Kent Street, Sydney - 880m2 - Aircell Retrosheild
  • Mirvac, Bond Street, Sydney - Refurbishment 34th Floor - 800m2 - Foilboard
  • SX Projects, Yves Apartments Manning St, Double Bay, Sydney - 550m2 - Isoboard
  • MLC Centre, 17th floor, Sydney - inconjuction with Programmed Services - 500m2 - Isoboard
  • Soho Projects, Reddham House School, Woollahra, Sydney - 220m2 - Foilboard, 150m2 - Kingspan Kooltherm K10
  • Built, Australian Maritime Museum, Darling Harbour, Sydney - 350m2 - Kingspan Kooltherm K10
Solartex Showroom:
Unit 1/169 South Creek Rd, Cromer   NSW   2099
Phone: (02) 9971 4600

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1/169 South Creek Road Cromer, NSW 2099, Australia