Unilin Insulation | The new name for Xtratherm Insulation in the UK & Ireland.
The 52.5mm XT/TL-MF Thin-R Thermal Liner (Mechanically Fixed) combines a Unilin 40mm PIR insulation layer with a composite foil facing, bonded to 12.5mm tapered edge plasterboard. This composite panel delivers both insulation and drylining for internal walls, sloped roofs, and ceilings in mechanically fixed applications.
The 52.5mm Insulated Plasterboard features composite foil facing on both sides with an integrated vapour control layer that minimises condensation risk. Designed for high thermal performance and rapid installation, the Mechanically Fixed XT/TL Thermal Liner suits both new builds and renovation work.
Brand: Unilin
Thickness: 52.5mm overall
Model: 52.5mm XT/TL-MF Drylined
Dimensions: 2,400mm x 1,200mm x 52.5mm
Compressive Strength: 150 kPa
Density: 30-32 Kg/m3
Length: 2400mm
Material: PIR core ǀ Gypsum plasterboard
Profile: Tapered edge plasterboard
R-Value: 1.87 m2K/W
Thermal Conductivity: 0.022 W/mk
Vapour Resistivity: 100 MNs/gm
Finish: Foil facing on both sides ǀ Composite Kraft facings
Reaction To Fire: Euroclass B s1 d0
Applications: internal walls, sloped roofs & ceilings - Mechanically Fixed Applications
Vapour Control Layer: Yes, build in
Fixing method: Mechanically Fixed
Features: PIR Thermal Insulated Plasterboard
Type: Thermal Liner®
Flexural Strength: ≥160N Transverse / ≥400N Longitudinal
The 52.5mm Thermal Liner XT/TL-MF delivers thermal insulation and drylining simultaneously, making it the go-to choice for new construction and refurbishment schemes. It enhances your home's energy performance while reducing heating costs and creating a more comfortable living environment.
This Insulation Board is chemically inert and manufactured with a blowing agent featuring zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).
Upgrading your home's thermal efficiency offers substantial advantages, from lower utility bills to enhanced comfort levels. The Unilin XT/TL-MF Thermal Liner is an efficient solution for achieving superior energy performance in your property.
The PIR board also delivers fire resistance through continuous adhesive ribbons, particularly around openings such as windows and doors.
The 52.5mm XT/TL-MF insulated plasterboards (40mm insulation + 12.5mm plasterboard) integrate a plasterboard layer with an insulation core, typically PIR-based. The insulation bonds to the plasterboard, creating a single multi-purpose panel that provides both thermal performance and a finished surface. Construction projects benefit from improved thermal and sound insulation, alongside faster installation. These boards work well in walls, ceilings, and floors, with various sizes and thicknesses available to match specific building needs.
Browse our Unilin range and filter by thickness or coverage on the left side of the page. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee or use Live Chat - Lowest UK Insulation Prices.

















