Superwhite 34 Blown Cavity (New Build)


Superglass Superwhite 34 is a high performance, non-combustible and British Board of Agrément (BBA) approved glass mineral wool blown cavity wall insulation. Superwhite 34 has a 25 year guarantee and is inspected under the BBA Surveillance Scheme for cavity wall insulation.


Superglass Superwhite 34 is designed to provide thermal insulation for new-build masonry cavity walls with a minimum cavity width of 90mm and up to 12m in height. It can be installed in buildings of 12m – 25m in height subject to a satisfactory inspection of the wall construction and installation approval by Superglass Insulation..

Superglass Superwhite 34 is BBA approved for all UK exposure zones (subject to conditions detailed in the BBA Certificate and NHBC Standards) and can also be installed in masonry party/separating walls as detailed within the Robust Details Handbook.

Superwhite 34 may also be used in party walls and is a component in a number of Robust Details Solutions including proprietary system E-WM-33.

Accreditations and Certifications

Accreditations and Certifications


Superglass Superwhite 34 is installed after the walls are built, from inside the building. It’s installed quickly and easily in any weather using existing machinery by a national network of Superglass and BBA approved installers.


Superwhite 34 Blown Cavity (New Build)

Key Benefits

Thermal Performance
Thermal Performance
– 0.034W/mK, the best thermal conductivity available in the UK for a blown glass mineral wool cavity wall insulation product.
Fire Performance
Fire Performance
– Classified as A1 non-combustible (the highest possible rating).
Recycled Content
Recycled Content
– Manufactured from up to 84% recycled glass.
– BRE Green Guide Rating of A+ and ISO 14001 accredited.
– Can be installed in any weather conditions from inside the building.
For an installed density of 25kg/m³ the following coverage should be obtained per bale.
Cavity Width (mm) Coverage (m²/bale)
90 7.30
100 6.60
110 6.00
115 5.80
125 5.30
135 4.90
145 4.60
150 4.40
155 4.30
165 4.00

NBS Specification

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Thermal Performance

Declared thermal conductivity of 0.034W/mK when tested to BS EN 14064- 1: 2010 (Lambda 90/90).

Fire Performance

All Superglass products are deemed non-combustible and have a fire classification of A1 (the highest possible rating) when tested to BS EN 13501-1 Reaction to Fire.


  • Manufactured in accordance with ISO 14001 – Environmental Management Systems.
  • Zero Ozone Depletion Potential & zero Global Warming Potential.
  • CFC & HCFC free.
  • Generic BRE Green Guide Rating of A+.
  • BRE Global verified Environmental Product Declaration (EPD)

Recycled Content

Manufactured from up to 84% recycled glass which would otherwise go to landfill.

Moisture Resistance

Tests by the BBA confirm that Superwhite 34 will not transmit water to the inner leaf. Please refer to the BBA certificate for more information.


Manufactured in accordance with:

  • BS EN 14064-1: 2010 for In-situ formed loose-fill mineral wool products
  • BS EN 13172 Thermal insulation products – Evaluation of conformity.
  • BS EN ISO 9001 Quality Management Systems (QMS).


Has a 25 year guarantee.

Handling & Storage

All Superglass products are easy to handle, cut and install. The products are supplied compression packed in polythene to provide short term protection only. For long term protection, the product must be stored indoors, or under a waterproof covering and off the ground to protect from weather damage. The products should not be left permanently exposed to the elements.