NBS Source
I'm a manufacturer
Compare variants

Celotex TB4000

Verified by manufacturer 2 months ago

20 mm thick.

Celotex Variant:

PIR insulation for multiple applications.

Jump to:
+44 (0)1473 822093 Website


  • Roofs - Pitched Roof Insulation - Between and Under Rafters.
  • Roofs - Flat Roof Insulation - Balconies and Terraces.
  • Roofs - Flat Roof Insulation - Between and Under Joists.
  • Walls - External Wall Insulation - Upgrading Cavity Walls.
  • Walls - External Wall Insulation - Timber Frame Walls.
  • Walls - External Wall Insulation - Solid Walls.
  • Floors - Ground Floor - Beam and Block Floors.
  • Floors - Ground Floor Insulation - Concrete Slab Ground Floors.
  • Floors - Ground Floor Insulation - Upgrading Concrete Slab Floors.
  • Floors - Ground Floor Insulation - Suspended Timber Floors.


Celotex TB4000 is an easy to install polyisocyanurate (PIR) insulation board with excellent thermal performance, featuring a low emissivity foil facing. Available in thicknesses from 20 mm to 40 mm, it can be considered for floor, wall and roof applications.

Product Features:

  • Lightweight 2400 x 1200 mm boards.
  • Low emissivity foil facing.
  • BBA Certified 17/5405.

Fire Classification

Euroclass F Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.

Product Benefits:

  • Thermal Performance - Excellent thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the thickness of insulation required to hit the target U-value.
  • High Performance Facer - Low emissivity foil facing provides improved thermal performance in sealed cavity air spaces, improving the achievable U-value.
  • Easy to Install - Celotex boards are light and rigid assisting with ease of transportation, handling and fitting.
  • BBA Certified - Celotex TB4000 has been assessed by the BBA as fit for use in defined roof, wall and floor applications if installed, used and maintained as set out in the certificate. Please read the certification at insulation-UK.com/BBA for full details and restrictions.

Key Considerations

When using Celotex TB4000, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards relevant for your construction or application, including requirements in relation to fire and applicable height restrictions.

Please refer to the following product documents:

  • Product Datasheet.
  • BBA Certificate.
  • Declaration of Performance.
  • Health & Safety Datasheet.

Celotex TB4000 should not be used in the external walls of buildings over 11 metres in height. Recent changes to Building Regulations mean that only non-combustible insulation or insulation of limited combustibility should be used in buildings of that height.

General information



Guidance for specification option:






Polyisocyanurate (PIR)




2400 mm


1200 mm


Pr_25_71_63_66 Polyisocyanurate (PIR) foam boardsPrimary


J31/10 Warm deck roof coating

J31/335 Warm deck roof insulation

J41/10 Reinforced bitumen membrane warm deck roof covering

J42/10 Warm deck roof covering

K10/125 Metal stud partition system

K10/155 Wall lining system (metal studs)

K10/220 Proprietary suspended ceiling system

K10/30 Metal stud

K10/50 Suspended ceiling system on metal framing

K11/115 Battened plywood floating floor

K11/125 Battened particleboard floating floor

K11/135 Battened oriented strand board floating floor

K11/145 Battened cement-bonded particleboard floating floor

K11/20 Battened particleboard floating floor

K11/215 Plywood floating floor

K11/225 Particleboard floating floor

K11/235 Oriented strand board floating floor

K11/245 Cement bonded particleboard floating floor

K11/25 Particleboard floating floor

K11/55 Rigid board insulation fixed as roof sarking

K11/795 Wall lining on metal framing

K21/120 Battened wood flooring

K21/130 Battened wood floating floor

K21/140 Battened wood laminate flooring

M10/290 Floating construction

M10/40 Floating construction

M13/260 Floating construction

M13/40 Floating construction

P10/140 Insulation fitted between rafters

P10/15 Insulation fitted between rafters

P10/170 Insulation to loft access hatches

P10/190 Insulation fitted between studs

P10/20 Insulation to loft access hatches

P10/40 Insulation fitted betweenor to the face ofstuds

Specification data - Polyisocyanurate (PIR) foam boards


To BS EN 13165.

Guidance for specification option:

Declaration of Performance (DoP): UKCA Marked to BS EN 13165.

Third-party certification

BRE Green Guide rating of A, Certificate number ENP413; BBA approved 17/5405; ISO 9001; ISO 14001.

Guidance for specification option:

  • SGS: Manufactured under Quality Management System. BS EN ISO 9001 - Certificate Number GB91/504.
  • SGS: Manufactured under Environmental Management System ISO 14001 - Certificate Number GB11/83526.
  • BBA approved for dry lining - Certificate Number 17/5405.
  • BBA approved for floor insulation - Certificate Number 17/5405.
  • BBA approved for pitched roof insulation - Certificate Number 17/5405.

Fire performance

Euroclass F Reaction to Fire classification, according to BS EN 13501-1. Products with this level of classification are not provided with a rating for smoke emission.

Thermal conductivity (maximum)

0.022 W/m.K.

Manufacturer guidance

Celotex TB4000 has a declared thermal conductivity of 0.022 W/m.K, according to BS EN 13165 for factory made rigid polyurethane foam (PU) products.

Compressive strength at 10% deformation

120 kPa.

Cross section

Uniform thickness.

Thickness (nominal)

20 mm.

Face size (length x width)

2400 x 1200 mm.


Manufacturer's standard.

Guidance for specification option:

Consult manufacturer for details.

Recycled content

Manufacturer's standard.





Thermal resistance (R-value)

0.90 m²K/W.


Manufacturer's standard.

Manufacturer guidance

Information regarding storage, installation and handling of Celotex products, or health and safety information, can be found on the manufacturer's website.

Sustainability data

Country of product manufacture

United Kingdom


Celotex TB4000

Celotex TB4000

Celotex TB4000 TDS

Celotex TB4000 TDS

Similar products from Celotex

Celotex CW4000

Celotex CW4000

Celotex GA4000

Celotex GA4000

Celotex PL4000

Celotex PL4000

Celotex Thermaclass Cavity Wall 21

Celotex Thermaclass Cavity Wall 21

Celotex XR4000

Celotex XR4000