Earthwool External Wall Batts

Wall Plain Pack


The Earthwool® External Wall Insulation Batt range is a new generation of softer, safer and more environmentally friendly glasswool insulation.

Advanced compression packaging reduces handling time and the storage space required on site. 

Although the product is primarily designed for use in external walls it can also be used for internal walls to reduce sound transmission from room to room. It is thermally efficient and cost effective in saving energy and providing increased comfort in buildings.

EarthWool BattsBatts are the traditional insulation product for insulating external walls and are available in thicknesses to suit 75mm, 90mm and 140mm timber and metal frames. Unlike reflective foil, Earthwool External Wall Batts prevent heat gain in summer and heat loss in winter by countering convection, conduction and radiation.

Knauf Insulation also offers High Density (HD) and Super High Density (SHD) External Wall Batts with increased density and lower thermal conductivity to maximise energy savings.

DriTherm®, a silicon treated insulation product, is also available for double brick walls.

Earthwool External Wall Insulation Batts are available at your local Bunnings Warehouse.

If you're installing Earthwool yourself then don't forget to check out our DIY Safety Instructions and Precautions before you start.




Earthwool External Wall Batts provide a cost-effective thermal and acoustic barrier for energy-efficient construction. The consistent quality, low dust, and clean-cutting resilient glasswool make fabrication easy and installation fast. Earthwool Batts can be used in timber and metal frame applications in residential structures.These applications include thermal and acoustic treatments to walls, ceilings and floors.

Knauf Insulation offers Earthwool in a wide range of sizes and R-values. Earthwool insulation can be used for cavity walls, floors, ceilings, attics, basements and crawlspaces. It is highly resilient, recovering quickly to full thickness. It also greatly reduces the transmission of noise in the home.


Specification Compliance

• AS/NZS 4859.1: 2002 Materials used in the Thermal Insulation of Buildings and comply with the Building Code of Australia (BCA) requirements.

Thermal Conductivity
• ASTM C 518

Thermal Resistance
• ASTM C 653

Specification Guide

The external wall insulation shall be Earthwool External Wall batts R*, *mm thick, BRANZ appraised to meet the provisions of the BCA. The product will be non-combustible, CFC/HCFC free, zero ODP and GWP, Global GreenTag™ Level A certified, glasswool insulation with high post-consumer recycled glass content and with ECOSE® Technology. It will be manufactured under Quality Assurance Standards ISO 9001:2008 and ISO 14001:2004 by Knauf Insulation and shall be installed in accordance with the instructions issued by them.

*architect to insert details of products used. 


The formulation used for Earthwool insulation has been independently assessed to meet the requirements of the stringent Note Q standard (and is therefore consistent with the highest Australian and New Zealand industry standards), and also assessed by Knauf Insulation against the criteria of the Australian Safety and Compensation Council ASCC Approved Criteria for Classifying Hazardous Substances [NOHSC: 1008 3rd Edition]. As a result of this assessment, Earthwool insulation is not classified as hazardous according to the NOHSC criteria.

Technical Data

Water Vapour Absorption (ASTM C 1104)
• Less than 5% by weight.

Corrosion Resistance (ASTM C 665)
• No greater than sterile cotton.

Microbial Growth (ASTM C 1338)
• Does not support microbial growth.

Fire Resistance (ASTM E 136)
• Non-combustible.


Earthwool External Wall Batts are free from CFCs, HCFCs and any other material with ozone depletion potential in its manufacture and content and represents no known threat to the environment.

Earthwool External Wall Batts’ manufacture has a low impact on the environment and is classified as Zero ODP and Zero GWP.

ECOSE-Logo -100px

ECOSE® Technology

Knauf Insulation mineral wool products with ECOSE Technology benefit from a revolutionary, bio-based, formaldehyde-free binder technology, based on rapidly renewable materials, instead of petro-based chemicals. It reduces embodied energy and delivers superior environmental sustainability.

The technology has been developed for Knauf Insulation's glass and rock mineral wool products, enhancing their environmental credentials without affecting the thermal, acoustic or fire performance. Insulation products made with ECOSE Technology contain no dye or artificial colours - the colour is completely natural.

Download the ECOSE Technology information booklet here.


Proven Performance

  • Preferred by professional installers concerned with quality, appearance and productivity.
  • Excellent acoustical properties reduce sound transmission in the home when  properly installed in walls, ceiling and floor systems.


  • Earthwool External Wall Batts are odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.

Superior Handling

  • Highly resilient insulation recovers quickly to full thickness for a snug fit and superior finished aesthetics.
  • Consistent quality materials feel good, cut easily and install fast. 
  • Low dust for easier handling and increased productivity.

Convenient Packaging, Easier Handling

  • Earthwool External Wall Batts are packaged in a strong, white poly bag that offers excellent protection from abuse, dust and moisture.
  • Earthwool External Wall Batts packages feature easy to follow installation instructions.
  • Master bag batt units (containing multiple packs) ensure reduced handling costs with improved compression – more square metres per bag, more square metres per truck load, fewer trips to the job site and less warehouse space for storage.

Superior Service and Support

  • Knauf Insulation is totally focused on providing first class customer service, producing high quality product and ‘on time in full’ deliveries. 
  • Knauf Insulation recognises the need to establish, develop and support a professional network of distributors and re-sellers in order to service a growing insulation market. 
  • Knauf Insulation is committed to providing a comprehensive range of relevant literature and web-based technical information to support specifiers and consumers.

Product Data

Earthwool External Timber Frame Wall Batts

 E-Code  R-Value  Thickness (mm)Width (mm)Length (mm)m²/ Pack$/m²
E2253 1.5 75 430 1160 20.95 $3.95
E2255 1.5 75 580 1160 28.26 $3.95
E2259 2.0 90 430 1160 15.96 $5.12
E2261 2.0 90 580 1160 21.53 $5.12
E3591 2.0 HD 75 430 1160 9.98 $7.13
E3592 2.0 HD 75 580 1160 13.46 $7.13
E4332 2.5 HD 90 430 1160 6.98 $9.95
E4333 2.5 HD 90 580 1160 9.42 $9.95
E4473 2.7 SHD 90 430 1160 4.99 $14.74
E4335 2.7 SHD 90 580 1160 6.73 $14.74
E4340 3.1 140 580 1160 14.80 $7.39

HD = High Density, SHD = Super High Density.
Pricing is GST Exclusive.

BRANZ Logo Sm                                                         Earthwool is available at your local Bunnings Warehouse

Earthwool External Metal Frame Wall Batts

 E-Code R-ValueThickness (mm)Width (mm)Length (mm)m²/ Pack$/m²


1.5 75 450 1200 22.68 $3.95
E2257 1.5 75 600 1200 30.24 $3.95
E2260 2.0 90 450 1200 17.28 $5.12
E2262 2.0 90 600 1200 23.04 $5.12
E3594 2.0 HD 75 450 1200 10.80 $7.13
E3595 2.0 HD 75 600 1200 14.40 $7.13

HD = High Density.
Pricing is GST Exclusive.

BRANZ Logo Sm                                                         Avail at Bunnings Logo