37.5mm Celotex PL4000 Insulated Plasterboard

37.5mm Celotex PL4000 insulated plasterboard combines a 25mm polyisocyanurate (PIR) core with a 12.5mm tapered edge plasterboard layer. The paper-faced design ensures straightforward installation across a wide range of building applications including roof and internal wall lining.

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

Properties

Brand: Celotex PL4000

Thickness: 37.5mm overall (25mm PIR insulation bonded to 12.5mm plasterboard)

Dimensions: 2,400mm x 1,200mm x 37.50mm

Compressive Strength: 120 kPa

Density: 26 - 36 kg/m³

Length: 2400mm

Width: 1200mm

Material: PIR core ǀ Tapered edge wallboard

R-Value: 1.20 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 37.5mm board delivers superior thermal performance with a thermal conductivity rating of 0.022 W/m.K, allowing thinner insulation layers to meet target U-values. The integrated 2-in-1 design eliminates the need for separate insulation and plasterboard products, streamlining both wall and roof insulation projects. Rigid construction ensures convenient handling, transport, and installation. The product holds BBA certification for plasterboard thermal laminate applications when installed and maintained according to certificate specifications.

Applications

Designed as a complete thermal and plasterboard solution, this board suits multiple building scenarios. Common uses include under-rafter and under-joist installations, solid masonry wall upgrades, 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

Combining insulation and plasterboard into one product, this board delivers a 2-in-1 solution for simultaneous thermal and dry lining installation on walls and roofs.

Sustainability

Achieving an A+ rating from the BRE Green Guide, this product demonstrates strong environmental credentials and supports BREEAM assessment requirements.

About

Celotex PL4000 is a paper-faced 25mm PIR insulation board laminated to 12.5mm plasterboard. It provides an integrated solution for efficient wall and roof insulation with dry lining capabilities. The excellent thermal performance reduces insulation thickness requirements whilst meeting target U-values.

Suitable for under-rafter and under-joist applications, solid masonry walls, and timber frame linings, the rigid construction simplifies transport, handling, and installation across diverse building projects.

Info

Explore our Celotex range and filter by thickness or coverage using the left-hand navigation. For product suitability advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the lowest UK Insulation prices.