External Wall Insulation Segments

Wall Plain Pack

The Earthwool® glasswool: External wall 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.

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

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


insulationEarthwool glasswool: 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 glasswool: External wall 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 glasswool: External wall batts in a wide range of sizes and R-values. Earthwool glasswool 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.

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 glasswool is odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.

Superior Handling

  • Highly resilient 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 glasswool is packaged in a strong, white poly bag that offers excellent protection from abuse, dust and moisture.
  • Earthwool glasswool packages feature easy to follow installation instructions.
  • Master bag 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.

Earthwool glasswool insulation: External wall segments

Material Code R-Value (m²K/W) Thickness (mm) Width (mm) Length (mm) Area per pack (m²) 
471038 2.2 90 580 1160 19.5
471039 2.4 90 580 1160 13.4
471070 2.6 90 430 1160 7.0
471071 2.6 90 580 1160 9.4
471040 2.8 90 430 1160 5.0
471041 2.8 90 580 1160 6.7
471042 3.2 140 580 1160 14.8
470319 3.6 140 580 1160 10.1
505604 4.1 140 580 1160 6.1

Calculate how many packs of insulation you will need here.

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Specification Compliance

• AS/NZS 4859.1: 2002 Materials used in the Thermal Insulation of Buildings and comply with the New Zealand Building Code requirements: B2 – Durability, E3 – External Moisture, F2 – Hazardous Building Materials,and H1 – Energy Efficiency, as appraised by BRANZ.

The Earthwool® glasswool: Wall range is an acceptable solution in terms of the New Zealand Building Code. This product is designed for use in timber and metal frame applications in new and existing domestic and commercial buildings. 

Thermal Conductivity
• ASTM C 518

Thermal Resistance
• ASTM C 653

Specification Guide

The wall insulation shall be Earthwool glasswool: Wall batts R*, *mm thick, BRANZ appraised to meet the provisions of the NZBC. The product will be non-combustible, CFC/HCHC free, zero ODP & GWP, Global GreenTag Cert™ 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 accrodance with the instructions issued by them. 

*architect to insert details of product used. 


The formulation used for Earthwool glasswool has been independently assessed to meet the requirements of the stringent Note Q standard (and is therefore consistent with the highest 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 glasswool 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.

BRANZ Appraisal

BRANZ Appraisal

GreenTag Level A Certification

GreenTag Certification

Earthwool glasswool MSDS