Kingspan Kooltherm K118 42.5mm Insulated Plasterboard

42.5mm K118 by Kingspan Kooltherm is a high-performance insulated plasterboard engineered for mechanically fixed and adhesively bonded insulated drylining systems. This all-in-one solution delivers outstanding thermal performance with a thermal conductivity of 0.019 W/mK, enabling slim wall constructions without compromising on insulation quality. It combines insulation, drylining, and vapour control in a single board, suitable for solid stonework and brickwork applications, whether pre-lined or unlined.

The 42.5mm Kooltherm Kingspan offers several key advantages. As one of the thinnest Internal Wall Insulation (IWI) options available, it maximises usable floor space in buildings where external insulation is not feasible. The integrated drylining and vapour control layer streamline installation, whilst its lightweight construction ensures straightforward handling and fixing.

Properties

Model: 42.5mm K118

Thickness: 42.5mm

Pack Quantity: 1 sheet

Pack Weight: 572.75kg

Dimensions: 2,400mm x 1,200mm x 42.50mm (30mm Phenolic PIR bonded to 12.5mm Plasterboard)

Length: 2400mm

Width: 1200mm

Compressive Strength: >100 (kPa)

Material: Phenolic core ǀ Gypsum plasterboard

R-Value: 1.55m2K/W

Thermal Conductivity: 0.019 W/mK across all thicknesses.

Fire Classification: Euroclass C-s1, d0

Coverage: 60.48m2

Insulation Material: 42.5mm 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 readily accepts dryjointing compounds and plaster finishes.

Reverse Facing: The rear of Kingspan K118 incorporates a low emissivity composite foil, factory-bonded to the insulation core for enhanced thermal 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 premium rigid thermoset phenolic insulation board delivers exceptional thermal resistance at 0.019 W/mK whilst serving triple duty as insulation, drylining, and vapour control. The product enables rapid heating response, provides excellent air tightness, and resists moisture vapour transmission. Installation is straightforward, and it suits new build, retrofit, and refurbishment projects equally well. The board is manufactured using a blowing agent with zero ODP and minimal GWP impact.

Applications

This 42.5mm product works across numerous construction scenarios, including cavity masonry wall systems, solid walls, timber frame construction, ceiling installations, metal furring applications, direct mechanical fixing to masonry, and both horizontal and sloped ceiling linings. It performs effectively in Masonry Wall constructions and when fixed to timber framing or battens.

Benefits of Kooltherm

The slim profile of Kingspan k118 insulated plasterboard preserves valuable internal space, increasing lettable floor area and enhancing property value for buyers and tenants alike.

Sustainability

Kingspan has integrated Kooltherm into its Planet Passionate sustainability programme.

The core

The 42.5mm K118 insulated plasterboard features a high-performance, rigid, thermoset, fibre-free phenolic core manufactured with a zero ODP and low GWP blowing agent.

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 project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK Insulation prices.