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Non-combustible White Faced Soffit Insulation

Non-combustible as per NCC 2022, Clause C2D10(6)(g), IROCK PLUS soffit insulation is a thermal and acoustic insulation material comprising of a rigid stonewool insulation board bonded to either a non-combustible FIRESPAN facer or a pure aluminium facer. Providing an attractive white finish and high-density 10 KN/m2 compressive strength, IROCK PLUS is the safe and responsible choice for all under-slab soffit applications such as car-parks, high-rise apartment buildings and health buildings. Compared to alternative materials, IROCK PLUS produces much less smoke in a fire scenario and has superior ageing performance.


IROCK PLUS is deemed non-combustible when tested to AS 1530.1 and AS 1530.3 in accordance with NCC 2022, Clause C2D10(6)(g) meaning it an be used wherever a non-combustible material is required.

Moisture Resistant

Although not suitable for permanent immersion or exposure to drenching, IROCK PLUS insulation board's thermal performance will not be adversely affected by condensation or contact with liquid water.

Excellent Acoustic Performance

Along with excellent fire safety and thermal performance, IROCK PLUS also provides an excellent acoustic performance of NRC >1.0 in accordance with ISO 354-2006 providing an ideal solution for party walls.

Light-weight & Attractive

Not only are IROCK PLUS insulation boards very lightweight (only 100kg/m3), they also offer a very attractive white finish ideal for exposed under-slab soffit applications such as shopping centre car-parks.


With a nominal thermal conductivity of 0.036 W/mK and a very economical price-point, IROCK PLUS offers excellent thermal efficiency for minimal upfront cost along with life-cycle energy savings for the building.

Environmentally Friendly

Largely manufactured from recycled materials and natural rock, IROCK PLUS is environmentally friendly as an initial product. It also offers numerous environmental benefits in application as thermal insulation.

NCC 2022 Compliant

NCC 2022 Clause C2D10 specifically requires all components of external walls including cladding, insulation and framing to be non-combustible and IROCK PLUS is one of only a few materials that meet this criteria.

Superior Ageing Performance

Unlike low density batts which tend to slump in vertical applications or PIR and phenolic insulation which lose thermal performance over time, IROCK PLUS is anti-slump and has excellent long-term ageing performance.



Irock Plus Product Range + Bicep Ceiling System

White Soffit Insulation
White Joint Tape
Ceiling System


Irock Plus Availability



Lead Time


IRP401206 R1.11 IROCK PLUS 40mm White Soffit Insulation, 1200 x 600mm 8-10 Weeks  
IRP601206 R1.67 IROCK PLUS 60mm White Soffit Insulation, 1200 x 600mm 8-10 Weeks 5 Boards
IRP801206 R2.22 IROCK PLUS 80mm White Soffit Insulation, 1200 x 600mm 8-10 Weeks 4 Boards
IRD1001206 R2.78 IROCK PLUS 100mm White Soffit Insulation, 1200 x 600mm 8-10 Weeks 5 Boards
IRD1201206 R3.33 IROCK PLUS 120mm White Soffit Insulation, 1200 x 600mm 8-10 Weeks 5 Boards





Lead Time


ITW4850 INSULTAPE 48mm White High Tack Tape, 50m Roll Stock 1 Roll


Bicep Facade System (See seperate webpage)



Lead Time


BICEP BICEP Facade System for Insulated Facades - CLICK HERE Stock 1 Bracket


Irock Plus Technical Data

Test Item


Thermal Conductivity ASTM C518 0.036 W/mK
Acoustic Performance ISO 354-2006 1.0 NRC
Non-combustible (DtS) AS 1530.1 Pass
Ignitability Index AS 1530.3 0
Spread of Flame Index AS 1530.3 0
Heat Evolved Index AS 1530.3 0
Smoke Developed Index AS 1530.3 0-1
Material Density Actual 100 kg/m3
Compressive Strength ASTM C165-07 10 KN/m2
Maximum Service Temperature Actual <750°C
Melting Temperature Actual >1000°C
Rockwool Content Actual >95%
Resin Content Actual <5%
Water Absorption EN 1609 <1.1%
Fungal Resistance ASTM C655 Pass




Customer Support

For same day design assistance and technical support please contact our sales team directly on the below contact details. All our sales and technical staff are locally based so we can provide the best possible service and support for your project. You can also request a technical data sheet or project quotation using the below email links;

Frank Kutra
Product Manager
1300 945 123
0477 966 027
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  • Overview
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