Regency Loft Conversions

Loft Conversions Preston



Celotex GA4000 is a general purpose insulation board for floors, walls and roofs. It has long been at the heart of the Celotex product range providing the user with a range of thermal insulation solutions.

With low emissivity foil facings, GA4000 is manufactured from rigid polyisocyanurate (PIR) using a blend of blowing agents that have zero ozone depletion potential (zero ODP) and low global warming potential (GWP).

With Celotex GA4000 you are specifying an insulation board that:

  • Is suitable for use in a number of applications including roof, wall and floor systems
  • Comes in thicknesses ranging from 50mm-100mm
  • Is easy to cut and shape
  • Includes low emissivity foil facings giving improved thermal insulation

Performance within cavity air spaces:

  • Provides reliable long-term energy savings for buildings
  • Is available in a standard board size of 1200mm x 2400mm


Celotex GA4000 can be specified for use in a variety of applications including:

  • Dwarf Walls
  • Pitched Roofs
  • Flat Roofs
  • Solid Masonry Walls
  • Timber Framed & Steel Framed systems
  • Floors

Specification Clause

The insulation shall be Celotex GA4000 ________mm thick comprising a polyisocyanurate rigid foam insulation core, with a thermal conductivity of 0.022W/mK and low emissivity aluminium foil facings on both sides. GA4000 is A+ rated when compared to the BRE Green Guide 2008 and is CFC/HCFC free with zero ODP and low GWP. CE marking compliance to BS EN 13165:2001 and manufactured in accordance with quality management systems BS EN ISO 9001:2000 by Celotex Limited. All products must be installed in accordance with instructions issued by Celotex Limited.

Physical Properties

Compressive strength Dimensional stability Water vapour resistance Thermal conductivity Surface spread of flame


BS EN 826
BS EN 1604
BS EN 12086: Method B BS EN 12667
BS 476-7


DS( TH)8
>150 MNs/g
0.022 W/mK
Class 1 (50mm – 90mm only)

Typical U-values
U-values will vary depending on application. To calculate a specific U-value, please refer to our online U-value calculator at

Installation Guidelines

Installation of Celotex GA4000 will depend on application type. For full details of the installation of Celotex GA4000, please refer to the ‘application’ pages of the website at and select the application of interest.

Further Information
If you wish to contact Celotex, please visit and click on the ‘contact us’ page.

For information regarding storage, installation and handling of Celotex products, or for Health & Safety advice, please refer to to the ‘literature’ pages of the website at

Celotex has a policy of continuous product development and reserves the right to alter product designs or specifications without prior notice.

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