52.5mm Kingspan Kooltherm K118 Insulated Plasterboard

52.5mm K118 by Kingspan Kooltherm is a high-performance insulated plasterboard engineered for mechanically fixed and adhesively bonded drylining systems. This innovative product combines insulation, vapour control, and plasterboard in a single board, delivering a thermal conductivity of 0.019 W/mK. Ideal for solid stonework and brickwork applications, it works with or without existing linings to create slim, thermally efficient wall constructions.

The 52.5mm Kooltherm Kingspan offers exceptional benefits for internal space-constrained projects. As one of the thinnest Internal Wall Insulation (IWI) solutions available, it suits buildings where external insulation is not feasible. The integrated design provides insulation, drylining, and vapour control in one product. Its lightweight nature ensures straightforward handling, transport, and installation, whilst supporting rapid heating response and excellent air-tightness.

Properties

Model: 52.5mm K118

Thickness: 52.5mm

Pack Quantity: 1 sheet

Pack Weight: 28.03kg

Dimensions: 2,400mm x 1,200mm x 52.50mm (40mm Phenolic PIR bonded to 12.5mm Plasterboard)

Length: 2400mm

Width: 1200mm

Compressive Strength: >100 (kPa)

Material: Phenolic core ǀ Gypsum plasterboard

R-Value: 2.10m2K/W

Thermal Conductivity: 0.019 W/mK across all thicknesses.

Fire Classification: Euroclass C-s1, d0

Coverage: 2.88m2

Insulation Material: 52.5mm Kooltherm K118 is a premium-grade, lower-lambda rigid thermoset phenolic pir insulation.

Finish: Kraft facing ǀ Composite foil

Front Facing: The front surface features tapered-edge gypsum plasterboard that readily accepts dryjointing compounds and plaster skim finishes.

Reverse Facing: The reverse side of Kingspan K118 comprises a low-emissivity composite foil, autohesively bonded to the insulation core during production.

Applications: Internal Walls ǀ Roofs ǀ Ceilings

BBA Certified: Yes (no. 16/5299)

Vapour Control Layer: Yes, built in

Fixing method: Dot and Dab ǀ Mechanically Fixed

Decoration: Skim plaster

Features: Premium-performance insulated plasterboard

About

This premium rigid thermoset phenolic insulation board delivers outstanding thermal performance at 0.019 W/mK whilst serving triple duty as insulation, drylining, and vapour control. The product prevents air leakage, resists moisture vapour transmission, and enables responsive heating systems. Installation is straightforward, and the board suits new builds, retrofits, and refurbishment schemes. Manufactured using a blowing agent with zero ODP and minimal GWP, it represents a responsible choice for sustainable construction.

Applications

Kingspan 52.5mm performs well across diverse construction scenarios, including cavity masonry wall systems, solid walls, timber frame construction, ceiling installations, metal furring assemblies, timber-framed fixing, direct mechanical fixing to masonry, and both horizontal and sloped ceiling linings.

Benefits of Kooltherm

Adopting Kingspan k118 insulated plasterboard maximises usable floor area within properties, boosting lettable space, property value, and appeal to occupants and investors alike.

Sustainability

Kingspan has incorporated Kooltherm into its Planet Passionate sustainability framework.

The core

Kingspan 52.5mm K118 insulated plasterboard features a high-performance, rigid, thermoset, fibre-free phenolic core manufactured with zero ODP and low GWP blowing agents.

About Kingspan Insulation

Kingspan Insulation Ltd is part of Kingspan Group plc, a leading European construction products manufacturer. The Kingspan insulation Group was founded in the late 1960s and operates as a publicly listed company based in Kingscourt, County Cavan, Ireland.

Info

Browse our full Kingspan range and refine by thickness or coverage using the left-hand filters. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK Insulation prices.