Celotex PL4000 27.5mm Insulated Plasterboard

27.5mm Celotex PL4000 insulated plasterboard combines a polyisocyanurate (15mm PIR) insulation core with a paper-faced finish, laminated to 12.5mm tapered edge plasterboard. This integrated product suits multiple applications including roof and internal wall lining projects.

Standard 1200 x 2400mm boards feature paper facing and achieve a BRE Green Guide A+ rating. The product holds BBA approval under certificate 16/5357 for Plasterboard Thermal Laminate applications, with Euroclass B-s1, d0 fire classification per BS EN 13501-1.

Properties

Brand: Celotex PL4000

Thickness: 27.5mm overall (15mm PIR insulation bonded to 12.5mm plasterboard)

Dimensions: 2,400mm x 1,200mm x 27.5mm

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

The 27.5mm Celotex PL4000 delivers superior thermal performance with a thermal conductivity of 0.022 W/m.K, allowing thinner insulation layers to meet target U-values. This 2-in-1 product streamlines installation by combining insulation and plasterboard for simultaneous wall and roof insulation and dry lining. The rigid boards simplify transport, handling, and installation. Celotex 27.5mm PL4000 carries BBA certification for plasterboard thermal laminate applications when installed and maintained to certificate specifications.

Applications

The 27.5mm insulation board provides an integrated thermal insulation and plasterboard solution. Suitable applications include under-rafter and under-joist insulation, 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 merges insulation and plasterboard into one component, delivering a 2-in-1 solution for simultaneous insulation and dry lining of walls or roofs.

Sustainability

The A+ rating from the BRE Green Guide demonstrates environmental performance credentials, supporting BREEAM assessment documentation.

About

Celotex PL4000 is a 15mm 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, its excellent thermal performance enables thinner insulation layers to achieve target U-values.

The 27.5mm insulated plasterboard suits under-rafter or under-joist insulation, solid masonry walls, and timber frame lining applications. Its rigid construction ensures straightforward transport, handling, and installation.

Info

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