57.5mm Kingspan Kooltherm K118 Insulated Plasterboard

57.5mm K118 by Kingspan Kooltherm is a high-performance insulated plasterboard engineered for mechanically fixed and adhesively bonded drylining applications. This innovative product combines insulation, drylining, and vapour control in a single board, delivering a thermal conductivity of 0.019 W/mK. Ideal for slim wall constructions, it performs exceptionally well on solid stonework and brickwork, whether applied to existing linings or bare substrates.

The 57.5mm Kooltherm Kingspan offers several key advantages. Its slim profile makes it one of the thinnest Internal Wall Insulation (IWI) solutions available, perfect for projects where preserving internal space is essential. The integrated drylining and vapour control layer eliminates the need for additional components. Its lightweight nature simplifies handling, transport, and installation, whilst supporting rapid heating response and excellent air-tightness.

Properties

Model: 57.5mm K118

Thickness: 57.5mm

Pack Quantity: 14 sheets

Pack Weight: 399.50kg

Dimensions: 2,400mm x 1,200mm x 57.50mm (45mm Phenolic PIR bonded to 12.5mm Plasterboard)

Length: 2400mm

Width: 1200mm

Compressive Strength: >100 (kPa)

Material: Phenolic core ǀ Gypsum plasterboard

R-Value: 2.40m2K/W

Thermal Conductivity: 0.019 W/mK across all thicknesses.

Fire Classification: Euroclass C-s1, d0

Coverage: 40.32m2

Insulation Material: 57.5mm 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-based plasterboard that readily accepts dryjointing compounds and plaster skim coats.

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

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 thermal conductivity of 0.019 W/mK whilst serving as insulation, drylining, and vapour control in one integrated product. The board provides rapid heating response, prevents air infiltration, and resists water vapour transmission. Installation is straightforward, and it suits new build, retrofit, and refurbishment schemes. Manufactured using a blowing agent with zero ODP and low GWP, it represents a non-deleterious choice for environmentally conscious projects.

Applications

The 57.5mm Kingspan board works across diverse construction scenarios, including cavity masonry wall constructions, solid walls, timber frame walls, ceilings, metal furring systems, fixing to timber framing or battens, direct mechanical fixing to masonry, and horizontal or sloping ceiling linings.

Benefits of Kooltherm

The slim design of Kingspan k118 insulated plasterboard maximises usable floor area within properties, increasing lettable space and enhancing property value and appeal to buyers and tenants.

Sustainability

Kingspan has incorporated Kooltherm into its Planet Passionate sustainability programme.

The core

The 57.5mm K118 insulated plasterboard features a high-performance, rigid, thermoset, fibre-free phenolic insulation core. It is 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 filter by thickness or coverage using the left-hand menu. For project-specific advice, product suitability guidance, or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat for the best UK Insulation prices.