77.5mm Celotex PL4000 Insulated Plasterboard

77.5mm Celotex PL4000 insulated plasterboard combines a 65mm polyisocyanurate (PIR) insulation core with paper facing, laminated to a 12.5mm tapered edge plasterboard. This integrated solution simplifies installation for internal wall lining and roof applications across a range of thicknesses from 15mm to 65mm insulation thickness.

The product delivers standard 1200 x 2400mm boards with paper facing, achieving BRE Green Guide A+ rating and BBA approval (certificate 16/5357) for Plasterboard Thermal Laminate applications. Fire classification meets Euroclass B-s1, d0 Reaction to Fire per BS EN 13501-1.

Properties

Brand: Celotex PL4000

Thickness: 77.5mm overall (65mm PIR insulation bonded to 12.5mm plasterboard)

Dimensions: 2,400mm x 1,200mm x 77.5mm

Compressive Strength: 120 kPa

Density: 26 - 36 kg/m³

Length: 2400mm

Width: 1200mm

Material: PIR core ǀ Tapered edge wallboard

R-Value: 3.0 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

The 77.5mm Celotex PL4000 delivers outstanding thermal performance with a thermal conductivity rating of 0.022 W/m.K, enabling thinner insulation layers to meet your target U-value requirements. This product streamlines installation by merging insulation and plasterboard into a single 2-in-1 system, allowing you to insulate and dry line walls or roofs in one step. The rigid construction ensures straightforward transportation, handling, and fitting. As a BBA-certified product, the Celotex 77.5mm PL4000 meets all requirements for plasterboard thermal laminate applications when installed and maintained according to certificate specifications.

Applications

The 77.5mm insulation board range delivers a unified thermal insulation and plasterboard solution. Ideal applications include under-rafter and under-joist insulation, solid masonry wall construction, 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 77.5mm Celotex product merges insulation with plasterboard, delivering a 2-in-1 solution that insulates and dry lines walls or roofs simultaneously.

Sustainability

The product has earned an A+ rating from the BRE Green Guide, supporting your BREEAM assessment credentials and demonstrating strong environmental performance.

About

Celotex PL4000 is a 65mm PIR insulation board with paper facing, laminated to 12.5mm plasterboard. Engineered to provide an efficient, convenient solution for insulating and dry lining walls or roofs, it delivers excellent thermal performance that reduces the insulation thickness needed to achieve your target U-value.

The 77.5mm insulated plasterboard suits multiple applications including under-rafter or under-joist insulation, solid masonry walls, and timber frame lining. Its rigid structure makes transport, handling, and installation straightforward.

Info

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