40mm Celotex TB4040 PIR Insulation Board

The 40mm Celotex TB4040 is a high-performance polyisocyanurate (PIR) Insulation Board engineered for superior thermal efficiency and straightforward installation. Featuring a low emissivity foil facing, this product delivers exceptional results across multiple building applications, including Floor Insulation, wall systems, and roof construction.

Our 40mm PIR boards measuring 2400 x 1200mm offer lightweight performance combined with rigid structural integrity, making them an excellent choice for demanding Insulation requirements. The low emissivity foil facing enhances thermal performance in sealed cavity spaces. These boards achieve a BRE Green Guide A rating, confirming their environmental credentials. BBA certification (16/5352 for Timber Frame Dwellings and 17/5405 for Pitched Roof, Dry Lining, and Floor Insulation) validates their suitability across diverse applications.

Properties

Thickness: 40mm PIR

Length: 2400mm

Width: 1200mm

Dimensions: 2,400mm x 1,200mm x 40mm = 2.88m2

Weight: 4.84kg

Density: 42kg/m3

Material: Polyisocyanurate PIR Insulation

Profile: Improved thermal performance

Thermal Conductivity: 0.022 W/mk

R-Value: 1.8 m2K/W

Series: Celotex TB4000

Compressive Strength: 120kPa

Vapour Resistivity: 100 MNs/gm

Building Regulations: Compliant - 16/5352 | 17/5405

Finish: Low Emissivity Composite Foil Facing

Applications: Walls|Roofs ǀ Floors ǀ Ceilings

BBA Certified: Yes (no. 17/5405, 16/5352)

Reaction to Fire: Euroclass F

Edge Profile: Square Edge

Features: High-performance PIR Rigid Insulation

About

Thermal Performance - This 40mm Insulation Board delivers outstanding thermal resistance with a thermal conductivity rating of 0.022 W/m.K, enabling thinner insulation layers whilst maintaining target U-values.

High Performance Facer - The integrated low emissivity foil facing boosts thermal performance within sealed cavity spaces, contributing to improved overall U-value calculations.

Easy to Install - These 40mm boards combine lightweight construction with rigid strength, simplifying transport, handling, and on-site installation procedures.

BBA Certified - The Celotex TB4000 range holds BBA approval for specified roof, wall, and floor applications when correctly installed and maintained according to certification requirements.

Sustainability - Celotex Insulation TB4000 achieves a BRE Green Guide Rating of A

Applications

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 PIR Insulation

This 40mm PIR Insulation Board is recognised for delivering excellent thermal performance in a compact form, providing substantial insulation value with minimal thickness. Widely specified by construction professionals, this product combines high performance with application flexibility, helping to enhance building energy efficiency, lower operational heating and cooling expenses, and create improved thermal comfort indoors.

Info

Browse our full Celotex range and refine by thickness or coverage area using the filters on the left. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat - Lowest UK Insulation Prices.