Superwhite 40 Blown Cavity (Retro-fit)


Superglass Superwhite 40 is a high performance, non-combustible glass mineral wool blown cavity wall insulation. The product is British Board of Agrément (BBA) certified and Cavity Insulation Guarantee Agency (CIGA) approved. Superwhite 40 has a 25 year guarantee and is inspected under the BBA Surveillance Scheme for cavity wall insulation.


Superglass Superwhite 40 is designed specifically to provide thermal insulation for retro-fit/existing masonry cavity walls with a minimum cavity width of 50mm and up to 12m in height. It may 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 40 is BBA approved for all UK exposure zones (subject to conditions detailed in the BBA Certificate and NHBC Standards).


Superglass Superwhite 40 is installed quickly and easily, using existing machinery by a nationwide network of Superglass and BBA approved installers.


Wall Superwhite
Superwhite 40 Blown Cavity (Retro-fit)

Key Benefits

Thermal Performance
Thermal Performance
– Thermal conductivity of 0.040W/mK when tested to Lambda 90/90.
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.
– Installed after the walls are built by approved installers.
For an installed density of 18kg/m³ the following coverage should be obtained per bale.
Cavity Width (mm) Coverage (m²/bale)
50 18.40
55 16.80
60 15.40
65 14.20
70 13.20
75 12.30
80 11.50
90 10.20
100 9.20
125 7.40

Thermal Performance

Thermal conductivity of 0.040W/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 14001:2015 – Environmental Management Systems.
  • Zero Ozone Depletion Potential & zero Global Warming Potential.
  • CFC & HCFC free.
  • Generic BRE Green Guide Rating of A+.

Recycled Content

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

Moisture Resistance

Tests by the BBA confirm that Superwhite 40 will not transmit water to the inner leaf. Please refer to the BBA certificate for more information.


Manufactured in accordance with:

  • BS EN 13162:2012(+A1:2015) Thermal insulation products for buildings – Factory made mineral wool (MW) products.
  • BS EN 13172:2012 Thermal insulation products – Evaluation of conformity.
  • BS EN ISO 9001:2015 – Quality Management Systems (QMS).


Has a 25 year guarantee.

Handling & Storage

Supplied compression packed in polythene to provide short term protection. For long term protection, the product must be stored indoors or under a waterproof covering in order to protect against weather damage. Should not be left permanently exposed to the elements.