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Cavity Insulation Board

INSULBOARD C8 is a rigid cavity insulation board composed of a closed-cell thermoset polyisocyanurate foam core with two reflective foil facings. Tested in accordance with AS/NZ standards to comply with BCA/NCC requirements, INSULBOARD C8 is manufactured using blowing agents that are CFC/HCFC-free and have zero Ozone Depletion Potential (ODP). Providing higher R-values from less thickness, INSULBOARD C8 gives sustained thermal performance over time and is the go to option for all masonry cavity applications.  



Excellent Thermal Performance

INSULBOARD C8 provides excellent thermal properties with one of the lowest thermal conductivity ratings of any insulation material on the market at 0.022 W/mK.

Fire Testing

INSULBOARD C8 meets or exceeds all mandatory standards of the NCC/BCA and is therefore suitable for all applications including cavities, concrete wall framing and soffits.

Environmentally Friendly

INSULBOARD C8 cavity insulation is manufactured with a CFC/HCFC free blowing agent with Zero Ozone Depletion Potential (ODP) for a greener world.

Proven Performance

Used widely for all cavity applications on projects throughout Western Australia, INSULBOARD C8 can be specified and used with absolute confidence.

BCA Compliant

INSULBOARD C8 is compliant with AS/NZS 4859.1 and relevant Australian standards, giving confidence to builders and contractors for suitability in all cavity applications.

Fibre-free Material

Composed of a uniform closed-cell polyisocyanurate foam core with two foil facings, INSULBOARD C8 is non-irritant to the skin and non-allergenic.

Clear Cavity Maintained

When INSULBOARD C8 is used in wall cavity application a clear cavity is still maintained making the cavity easily accessible for services such as electricity and water.

More Cost Effective

Due to superior manufacturing technology and large volume production, INSULBOARD C8 is a more cost effective high R-value insulation than other alternatives.


INSULBOARD C8 Product Range







INSULBOARD 25mm Rigid Insulation, 2300 x 1200mm



1 Board 

IBF302312 INSULBOARD 30mm Rigid Insulation, 2300 x 1200mm R1.4 Stock 1 Board
IBF402312 INSULBOARD 40mm Rigid Insulation, 2300 x 1200mm R1.9 Stock 1 Board
IBF502312 INSULBOARD 50mm Rigid Insulation, 2300 x 1200mm R2.5 Stock 1 Board
IUC250 INSULBOARD Universal Retainer Clips, 250 Pack NA Stock 1 Pack
ITR4850 INSULTAPE 48mm Reinforced Foil Tape, 50m Roll NA Stock 1 Roll


INSULBOARD C8 Product Data

Test Item


Thermal Conductivity W/mK 0.020 - 0.021
Emittance Actual 0.04
Ignitability AS 1530.3 0
Flame Spread AS 1530.3 0
Heat Release AS 1530.3 0
Smoke Development AS 1530.3 1
Compressive Strength ASTM C1289-12 >110



INSULBOARD C8 Specification – Double Brick

The cavity wall insulation shall be INSULBOARD C8 ____ mm thick, comprising a closed-cell CFC/HCFC-free and zero ozone depletion potential (ODP) rigid thermoset polyisocyanurate foam core with two reflective foil facings tested in accordance with AS/NZ standards to comply with BCA/NCC and manufactured by BLUECHIP (08 9451 2344).


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