Kooltherm K18 Insulated Plasterboard

Kooltherm K18 Insulated Plasterboard Product Wedge

Insulated Dry-lining Plasterboard for Mechanical Fixing

Kingspan Kooltherm K18 Insulated Plasterboard is a super high performance, fibre-free rigid thermoset phenolic insulation, sandwiched between a front facing of tapered edge gypsum based plasterboard, and a reverse facing of low emissivity foil autohesively bonded to the insulation core during manufacture.

  • CodeMark certified
  • 3-in-1 insulation, dry-lining and vapour control
  • Available in a range of other selected lining materials
  • Group 1 BCA fire classification

Product Data table
Specification Guide
Installation Instructions
CAD Drawings
Testing and Data Table
Thermal Conductivity (λ-Value) 0.021 W/m·K (Insulant Thickness 25 - 44 mm)
0.020 W/m·K (Insulant Thickness ≥ 45 mm)
0.17 W/m·K (Plasterboard Thickness 10 mm) 
Product Dimensions 2400 mm x 1200 mm (2.88 m2)
Other dimension available upon enquiry. Minimum order quantities apply.
Product Thickness 35, 40, 50, 60, 70, 80, 90 mm
Other thicknesses available upon enquiry. Minimum order quantities apply.
Plasterboard Thickness 10 mm

Alternative lining boards, such as fibre cement sheets, can also be bonded to the insulation core to create customised finishes and facings in our Kingspan Kooltherm K18+ Insulated Lining Board range. Please contact us for more information.

Assumptions & Key

The R-values shown are Total R-values for the building element and are calculated in accordance with AS/NZS 4859.1 and NZS 4214. Kingspan Kooltherm products are manufactured, tested and packaged in conformance with AS/NZS 4859.1. The contribution of the product Total R-values depends on installation and environmental conditions.

Product R-values

 Product Thickness (inc. Plasterboard)  Product R-value
 35 mm  R1.3
 40 mm  R1.5
 50 mm  R2.0
 60 mm  R2.6
 70 mm  R3.1
 80 mm  R3.6
 90 mm  R4.1

System R-values

Click on the specific application types below to view their System R-values.

Residential Tiled Roof (Raked Ceiling)

View System R-value

Brick Veneer Wall

View System R-value

Steel-Framed Wall

View System R-value

Timber-Framed Wall

View System R-value
The wall dry-lining insulation shall be Kingspan Koolther K18 Insulated Plasterboard___ mm thick, comprising a CFC/HCFC–free and zero Ozone Depletion Potential (ODP) rigid thermoset phenolic insulation core with 10 mm plasterboard facing bonded to its front surface and a composite foil facing on its reverse surface, manufactured* under a management system certified to BS / I.S. EN ISO 9001:2008, BS / I.S. EN ISO 14001:2004 and BS / I.S. OHSAS 18001:2007 by Kingspan Insulation Limited and shall be installed in accordance with the instructions issued by them.

* Applies only to the Kingspan Kooltherm K10 insulation board used in the manufacture of this composite insulated plasterboard product.

CAD PDF - Residential Tiled Roof Exposed Beam_Kooltherm K18

CAD PDF - Residential Tiled Roof Raked Ceiling_Kooltherm K18

CAD PDF - Brick Veneer Wall_Kooltherm K18

CAD PDF - Timber Framed Wall_Kooltherm K18

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Kingspan Insulation Asia

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(+61) 448 39 2336