Celotex Insulated Plasterboard - PIR Backed Plasterboard

Frequently Asked Questions

What is Insulated Plasterboard?

Insulated plasterboard is a time saving and DIY friendly option for drylining and stud wall construction, comprised of a sheet of general-use plasterboard (such as wallboard) adhered to a sheet if insulating material - ranging from simple polystyrene backing to our high performance, foil-backed PIR insulation.

Sizes of Celotex Plasterboard

All sheets of Celotex PL4000 are created with 12.5mm general purpose plasterboard, but different sizes of Celotex insulation are used to suit a variety of uses. Available in 5 different thicknesses:

25mm, 40mm, 50mm, 60mm, 75mm,

The sheet is laminated to a 12.5mm plasterboard, to create a total thickness that includes the 12.5mm sheet, eg:

25mm Celotex + 12.5mm Plasterboard = 37.5mm Celotex Plasterboard.

Where to Use Celotex Insulated Plasterboard

Celotex insulated plasterboard is designed for use in roof and internal wall applications. It is ideal for loft conversions applied below the rafters - usually in combination with other insulation to help achieve a specific u-value - or below joists in flat roofs.

Why Choose Celotex Plasterboard?

Celotex plasterboard combines high-performance PIR insulation with quality plasterboard in one innovative solution, eliminating the need for separate insulation installation. This intelligent design approach reduces construction time whilst achieving superior thermal performance - perfect for meeting Part L Building Regulations across England, Wales, and Scotland.

Our range features industry-standard thicknesses from 27mm to 90mm, allowing you to specify the exact thermal performance your project requires. Each board delivers exceptional U-values, with thermal conductivity as low as 0.022 W/mK, ensuring your buildings stay warmer in winter and cooler in summer whilst reducing energy bills.

Expert Solutions for Every Application

Celotex PL4000 boards excel in new build construction, offering robust performance for walls, ceilings, and partition applications. The moisture-resistant PIR core maintains its insulating properties even in challenging conditions, whilst the high-quality plasterboard face accepts standard decorative finishes without compromise.

For renovation projects, Celotex PL4000 Plus provides enhanced performance with improved edge detailing, reducing thermal bridging and maximising energy efficiency. These boards prove particularly valuable in listed buildings and conservation areas where maintaining internal space is crucial.

Professional Installation Made Simple

Our Celotex plasterboard arrives with comprehensive technical support, including detailed fixing specifications and junction details. Each board features precision-cut edges and consistent thickness, ensuring professional results whether you're dot-and-dabbing to masonry or fixing to timber frames.

The lightweight construction - typically 30% lighter than traditional insulation-plus-plasterboard combinations - reduces structural loading whilst accelerating installation. Standard plasterboard tools and techniques apply, making these boards accessible to both experienced tradespeople and confident DIYers.

Complete System Solutions

We stock the full range of compatible accessories, from specialist fixings to edge trims and vapour control layers. Our technical team provides free U-value calculations and condensation risk analysis, ensuring your Celotex plasterboard specification meets building regulations whilst optimising cost-effectiveness.

Ready to enhance your next project? Browse our complete Celotex plasterboard collection or contact our expert team for personalised specification advice. With nationwide delivery across the UK and competitive trade pricing, we make premium insulation solutions accessible for every project.

Need technical support? Our building specialists are here to help you achieve optimal thermal performance with the right Celotex plasterboard solution.