165mm Celotex XR4165 PIR Insulation Board

The 165mm Celotex XR4165 is a polyisocyanurate (PIR) Insulation Board delivering exceptional thermal efficiency and straightforward installation. Featuring a low emissivity foil facing, this product suits multiple applications including Floor Insulation, walls, and roofs.

These 165mm PIR boards measuring 2400 x 1200mm provide an effective Insulation solution for demanding projects. The low emissivity foil facing enhances thermal performance significantly. The product achieves a BRE Green Guide A rating, confirming its sustainability credentials. BBA certification includes certificates 16/5352 for Timber Frame Dwellings and 17/5405 for Pitched Roof, Dry Lining, and Floor Insulation applications.

Properties

Thickness: 165mm PIR

Length: 2400mm

Width: 1200mm

Dimensions: 2,400mm x 1,200mm x 165mm = 2.88m2

Weight: 15.25kg

Density: 42kg/m3

Material: Polyisocyanurate PIR Insulation

Profile: Improved thermal performance

Thermal Conductivity: 0.022 W/mk

R-Value: 7.50 m2K/W

Series: Celotex XR4000

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 165mm Insulation Board delivers outstanding thermal performance with a thermal conductivity rating of 0.022 W/m.K, enabling reduced insulation thickness whilst meeting required U-values.

High Performance Facer - The low emissivity foil facing improves thermal performance within sealed cavity air spaces, delivering enhanced U-value results.

Easy to Install - The 165mm Celotex boards combine lightweight construction with rigid strength, simplifying transport, handling, and installation on site.

BBA Certified - Celotex XR4000 holds BBA approval for defined roof, wall and floor applications when installed, used and maintained according to certificate requirements.

Sustainability - Celotex Insulation XR4000 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 165mm PIR Insulation Board delivers superior thermal performance in a compact thickness, making it ideal for contractors and builders seeking high-performance solutions. The product enhances building energy efficiency, reduces operational heating and cooling expenses, and creates a more comfortable interior climate.

Info

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