35mm Celotex TB4035 PIR Insulation Board

The 35mm Celotex TB4035 is a polyisocyanurate (PIR) Insulation Board delivering exceptional thermal performance with straightforward installation. Featuring a low emissivity foil facing and available across multiple thicknesses, this board suits diverse applications including Floor Insulation, walls, and roofs.

These lightweight 35mm PIR boards measuring 2400 x 1200mm provide reliable Insulation with superior thermal efficiency. The low emissivity foil facing enhances performance in sealed cavity spaces. Achieving a BRE Green Guide A rating confirms environmental credentials. BBA certification (16/5352 for Timber Frame Dwellings and 17/5405 for Pitched Roof, Dry Lining, and Floor Insulation) validates suitability across multiple applications.

Properties

Thickness: 35mm PIR

Length: 2400mm

Width: 1200mm

Dimensions: 2,400mm x 1,200mm x 35mm = 2.88m2

Weight: 4.23kg

Density: 42kg/m3

Material: Polyisocyanurate PIR Insulation

Profile: Improved thermal performance

Thermal Conductivity: 0.022 W/mk

R-Value: 1.55 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 35mm Insulation Board delivers outstanding thermal efficiency with a thermal conductivity rating of 0.022 W/m.K, enabling thinner insulation layers to meet required U-values.

High Performance Facer - The low emissivity foil facing enhances thermal performance within sealed cavity spaces, achieving improved U-values.

Easy to Install - These 35mm Celotex boards remain light and rigid, simplifying transport, handling, and installation processes.

BBA Certified - The Celotex TB4000 range holds BBA approval for specified roof, wall, and floor applications when properly installed and maintained per certificate 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 35mm PIR Insulation Board offers excellent thermal performance with minimal thickness, making it a preferred solution for builders and contractors. Its high-performance properties enhance building energy efficiency, reduce operational heating and cooling expenses, and create improved indoor comfort levels.

Info

Explore our full Celotex range and refine by thickness or coverage using the left-hand filters. For product suitability advice or bulk quotations, contact us on +4402039519012, email sales@insulationbee.co.uk, or use Live Chat - Lowest UK Insulation Prices.