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 internal drylining systems. This all-in-one product combines insulation, drylining, and vapour control in a single board, delivering exceptional thermal performance with a conductivity of 0.019 W/mK. Perfect for solid masonry, brickwork, and timber frame applications, it creates slim wall constructions without compromising on insulation quality.

The 52.5mm Kooltherm Kingspan offers several key advantages. As one of the thinnest Internal Wall Insulation (IWI) solutions available, it maximises usable floor space in properties where external insulation is not viable. The integrated drylining and vapour control layer streamline installation, whilst its lightweight design ensures straightforward handling and fixing.

Properties

Model: 52.5mm K118

Thickness: 52.5mm

Pack Quantity: 15 sheets

Pack Weight: 420.48kg

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: 43.20m2

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

Finish: Kraft facing ǀ Composite foil

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

Reverse Facing: The rear surface of Kingspan K118 incorporates a low-emissivity composite foil, factory-bonded to the insulation core for enhanced performance.

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 rigid thermoset 52.5mm phenolic insulation board delivers outstanding thermal efficiency at 0.019 W/mK whilst serving triple duty as insulation, drylining, and vapour barrier. The product provides rapid thermal response, excellent air-tightness, and effective moisture resistance. Manufactured with environmentally responsible blowing agents (zero ODP, low GWP), it suits new builds, retrofits, and refurbishment projects alike. Installation is straightforward, and the lightweight composition reduces handling demands.

Applications

This 52.5mm product works across diverse construction scenarios: cavity masonry walls, solid brick and stone, timber frame construction, ceiling and roof applications, metal furring systems, direct mechanical fixing to masonry, and both horizontal and sloped ceiling installations.

Benefits of Kooltherm

The slim profile of Kingspan K118 insulated plasterboard preserves valuable internal space, increasing lettable floor area and boosting property value and appeal to buyers and tenants.

Sustainability

Kingspan integrates Kooltherm products into its Planet Passionate sustainability commitment.

The Core

The 52.5mm K118 insulated plasterboard features a high-performance, rigid, thermoset phenolic core with no fibres. It is manufactured using environmentally conscious blowing agents with zero Ozone Depletion Potential (ODP) and minimal Global Warming Potential (GWP).

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 filters on the left. For product suitability advice or bulk pricing, contact us on +4402038839057, email sales@insulationbee, or use Live Chat - Lowest UK Insulation Prices.