Celotex PL4055 67.5mm Insulated Plasterboard

67.5mm Celotex PL4000 insulated plasterboard combines a 55mm polyisocyanurate (PIR) core with a 12.5mm tapered edge plasterboard layer. The paper-faced design simplifies installation across multiple applications including internal wall lining and roof work.

Standard boards measure 1200 x 2400mm and achieve a BRE Green Guide A+ rating with BBA approval (certificate 16/5357) for Plasterboard Thermal Laminate. The product meets Euroclass B-s1, d0 Reaction to Fire classification under BS EN 13501-1.

Properties

Brand: Celotex PL4055

Thickness: 67.5mm overall (55mm PIR insulation bonded to 12.5mm plasterboard)

Dimensions: 2,400mm x 1,200mm x 67.5mm

Compressive Strength: 120 kPa

Density: 26 - 36 kg/m³

Length: 2400mm

Width: 1200mm

Material: PIR core ǀ Tapered edge wallboard

R-Value: 2.75 m2K/W

Thermal Conductivity: 0.022W/mK

Vapour Resistivity: 100 MNs/gm

Fire Rating (Reaction to Fire): B(Class 0)

Finish: Kraft paper facings

Applications: Wall linings ǀ Pitched and flat roofs

Vapour Control Layer: Yes, build in

Fixing method: Adhesive bonding ǀ Mechanical fixing

Features: Multi-purpose Insulated Plasterboard

Product Benefits

This 67.5mm board delivers superior thermal performance with a thermal conductivity of 0.022 W/m.K, reducing the insulation depth needed to meet target U-values. The integrated design merges insulation and plasterboard into one product, enabling simultaneous thermal and dry lining work on walls and roofs. The rigid construction ensures straightforward transport, handling, and installation. BBA certification confirms suitability for plasterboard thermal laminate applications when installed and maintained according to certificate specifications.

Applications

This combined insulation and plasterboard solution suits multiple scenarios including under-rafter and under-joist layers, solid masonry walls, and timber frame lining projects.

1. Roofs - Pitched Roof Insulation - Between and Under Rafters
2. Roofs - Flat Roof Insulation - Balconies and Terraces
3. Roofs - Flat Roof Insulation - Between and Under Joists
4. Walls - External Wall Insulation - Upgrading Cavity Walls
5. Walls - External Wall Insulation - Timber Frame Walls
6. Walls - External Wall Insulation - Solid Walls

Time Saving

This product combines insulation and plasterboard into a single component, delivering a 2-in-1 solution for thermal and dry lining work on walls and roofs in one step.

Sustainability

The A+ BRE Green Guide rating demonstrates strong environmental credentials and supports BREEAM assessment performance.

About

Celotex PL4055 is a 55mm PIR insulation board with paper facing, laminated to 12.5mm plasterboard. Engineered to provide an efficient combined solution for insulating and dry lining walls or roofs, it achieves excellent thermal performance that minimises the insulation thickness required to reach target U-values.

Suitable for under-rafter and under-joist applications, solid masonry walls, and timber frame lining, the rigid construction ensures simple transport, handling, and fitting.

Info

Explore our Celotex range and filter by thickness or coverage using the left-hand menu. For project suitability advice or quantity discount quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat - Lowest UK Insulation Prices.