120mm Celotex XR4120 PIR Insulation Board

The 120mm Celotex XR4120 is a polyisocyanurate (PIR) Insulation Board offering exceptional thermal efficiency and straightforward installation. Featuring a low emissivity foil facing, this product suits multiple applications including Floor Insulation, walls, and roofs.

These lightweight 120mm PIR boards measuring 2400 x 1200mm deliver reliable Insulation performance. The low emissivity foil facing enhances thermal properties significantly. The product achieves a BRE Green Guide A rating, confirming its sustainability credentials. BBA certification is held under certificates 16/5352 for Timber Frame Dwellings and 17/5405 for Pitched Roof, Dry Lining, and Floor Insulation applications.

Properties

Thickness: 120mm PIR

Length: 2400mm

Width: 1200mm

Dimensions: 2,400mm x 1,200mm x 120mm = 2.88m2

Weight: 11.23kg

Density: 42kg/m3

Material: Polyisocyanurate PIR Insulation

Profile: Improved thermal performance

Thermal Conductivity: 0.022 W/mk

R-Value: 5.45 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 120mm Insulation Board delivers outstanding thermal efficiency with a thermal conductivity rating of 0.022 W/m.K, enabling reduced insulation thickness whilst meeting required U-value targets.

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

Easy to Install - These 120mm Celotex boards are light and rigid, simplifying transportation, 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 certification 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 120mm PIR Insulation Board is recognised for superior thermal performance, delivering substantial insulation value with minimal thickness. Contractors and builders favour this product for its high performance and broad suitability across projects. It enhances building energy efficiency, lowers heating and cooling expenses, and creates a more comfortable living space.

Info

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