| Product Data |
| Thermal Conductivity (λ-Value) |
0.021 W/m·K at 23oC (Insulant thickness ≥ 45 mm)
0.023 W/m.K at 23oC (Insulant thickness 25 – 44 mm)
0.17 W/m.K at 23oC (Plasterboard Thickness 10 mm) |
| Product Dimensions |
2400 mm x 1200 mm (2.88 m2)
Other dimension available upon enquiry. Minimum order quantities apply. |
Nominal Product
Thickness (inc. Plasterboard) |
35, 40, 50, 60, 70, 80, 90 mm
Other thicknesses available upon enquiry. Minimum order quantities apply. |
| Nominal 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.
Technical Service
If your construction is different from those specified, and/or to gain a comprehensive R Value calculation and technical information of your project, please consult the Kingspan Insulation Technical Service Department for assistance. Call 1300 247 235 and press “2” to speak with Technical Services, email technical@kingspaninsulation.com.au, or use the Online Contact Form
Assumption and Key
NCC 2019 prescribes different methods to determine Total R-value Calculations for Volume 1 and Volume 2. The systems noted on this page are Total R-values for the building element as required by the Energy Provisions of the National Construction Code, calculated in accordance with AS/NZS 4859.2 2018 & NZS 4214. Kingspan Kooltherm® products are manufactured, tested and packaged in conformance with AS/NZS 4859.1:2018
Fire Resistance
Examples shown are suitable for NCC Class 1 & 10a housing and Fire-Resisting Construction Type C walls in NCC Class 2 – 9 buildings. For Fire-Resisting Construction Type A & B walls in NCC Class 2 – 9 buildings a Performance Solution is required. Please contact Kingspan Insulation Technical Services on 1300 247 235 or email technical@kingspaninsulation.com.au for further guidance.
Product R-values
| Nominal Product Thickness (inc. Plasterboard) |
Declared Product R-value at 23oC |
| 35 mm |
R1.16 |
| 40 mm |
R1.36 |
| 50 mm |
R1.81 |
| 60mm |
R2.41 |
| 70mm |
R2.91 |
| 80mm |
R3.41 |
| 90mm |
R3.86 |
Mechanically Fixed to Timber Rafters (Covered Beams) – Tiled Roof
System R-value
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume One, Class 2 to 9 buildings
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.3 |
RT1.9 |
| 40 mm |
RT2.5 |
RT2.1 |
| 50 mm |
RT3.0 |
RT2.6 |
| 60 mm |
RT3.6 |
RT3.2 |
| 70 mm |
RT4.1 |
RT3.7 |
| 80 mm |
RT4.5 |
RT4.2 |
| 90 mm |
RT5.0 |
RT4.7 |
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume Two, Class 1 & 10a buildings and NCC Volume One, Class 2 sole-occupancy unit or a Class 4 part of a building
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.3 |
RT1.9 |
| 40 mm |
RT2.5 |
RT2.1 |
| 50 mm |
RT2.9 |
RT2.5 |
| 60 mm |
RT3.6 |
RT3.2 |
| 70 mm |
RT4.0 |
RT3.7 |
| 80 mm |
RT4.5 |
RT4.2 |
| 90 mm |
RT5.0 |
RT4.7 |
Mechanically Fixed to Timber Rafters (Covered Beams) – Metal Roof
System R-value
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume One, Class 2 to 9 buildings
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.3 |
RT1.9 |
| 40 mm |
RT2.5 |
RT2.1 |
| 50 mm |
RT3.0 |
RT2.6 |
| 60 mm |
RT3.6 |
RT3.2 |
| 70 mm |
RT4.0 |
RT3.7 |
| 80 mm |
RT4.5 |
RT4.2 |
| 90 mm |
RT5.0 |
RT4.7 |
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume Two, Class 1 & 10a buildings and NCC Volume One, Class 2 sole-occupancy unit or a Class 4 part of a building
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.3 |
RT2.0 |
| 40 mm |
RT2.5 |
RT2.1 |
| 50 mm |
RT2.9 |
RT2.5 |
| 60 mm |
RT3.6 |
RT3.2 |
| 70 mm |
RT4.0 |
RT3.7 |
| 80 mm |
RT4.5 |
RT4.2 |
| 90 mm |
RT5.1 |
RT4.8 |
Mechanically Fixed to Timber Framing
System R-value
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume One, Class 2 to 9 buildings & NCC Volume Two, Class 1 & 10a buildings
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.1 |
RT2.2 |
| 40 mm |
RT2.3 |
RT2.4 |
| 50 mm |
RT2.8 |
RT2.8 |
| 60 mm |
RT3.4 |
RT3.5 |
| 70 mm |
RT3.8 |
RT4.0 |
| 80 mm |
RT4.3 |
RT4.5 |
| 90 mm |
RT4.8 |
RT5.0 |
Mechanically Fixed to Internal Side of Steel Frame with Close Jointed Cladding
System R-value
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume One, Class 2 to 9 buildings
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.0 |
RT2.0 |
| 40 mm |
RT2.2 |
RT2.2 |
| 50 mm |
RT2.6 |
RT2.7 |
| 60 mm |
RT3.2 |
RT3.3 |
| 70 mm |
RT3.7 |
RT3.8 |
| 80 mm |
RT4.1 |
RT4.3 |
| 90 mm |
RT4.6 |
RT4.8 |
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for for NCC Volume Two, Class 1 & 10a buildings and NCC Volume One, Class 2 sole-occupancy unit or a Class 4 part of a building
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT2.0 |
RT2.1 |
| 40 mm |
RT2.2 |
RT2.3 |
| 50 mm |
RT2.7 |
RT2.7 |
| 60 mm |
RT3.3 |
RT3.4 |
| 70 mm |
RT3.7 |
RT3.9 |
| 80 mm |
RT4.2 |
RT4.4 |
| 90 mm |
RT4.7 |
RT4.9 |
Mechanically Fixed to Internal Side of Timber Frame with Close Jointed Cladding
System R-value
Total R–values for various thicknesses of Kingspan Kooltherm® K18 Insulated Plasterboard applicable for NCC Volume One, Class 2 to 9 buildings and NCC Volume Two, Class 1 & 10a buildings
| Product Thickness (inc. Plasterboard) |
Heat Flow In (Summer) |
Heat Flow Out (Winter) |
| 35 mm |
RT1.8 |
RT1.9 |
| 40 mm |
RT2.1 |
RT2.1 |
| 50 mm |
RT2.5 |
RT2.6 |
| 60 mm |
RT3.1 |
RT3.2 |
| 70 mm |
RT3.6 |
RT3.7 |
| 80 mm |
RT4.0 |
RT4.2 |
| 90 mm |
RT4.5 |
RT4.7 |
Kooltherm K18 Insulated Plasterboard Model Specification
You can also download the comprehensive model specification here. |
Download |
Specification Clause
The wall dry-lining insulation shall be Kingspan Kooltherm K18 Insulated Plasterboard _____ mm thick, with a tested smoke obscuration of not more than 5 m2/kg, 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 Pty Ltd and shall be installed in accordance with the instructions issued by them. A Project Specific Warranty provided by Kingspan Insulation must be submitted.
* Applies only to the Kingspan Kooltherm K10 insulation board used in the manufacture of this composite insulated plasterboard product.
Specify with: 
Handling & Storage
Storage
The packaging of Kingspan Kooltherm should not be considered adequate for outdoor protection. Boards should be stored inside a building. If, however, temporary outdoor storage cannot be avoided then the boards should be stacked flat on a level base, clear of the ground, and completely protected from inclement weather through use of a polythene sheet or weatherproof tarpaulin. Boards that have been allowed to get wet should not be used.
Resistance to Solvents
The insulation core is resistant to short-term contact with petrol and with most dilute acids, alkalis and mineral oils. However, it is recommended that any spills be cleaned off fully before the boards are installed. Ensure that safe methods of cleaning are used, as recommended by suppliers of the spilt liquid. The insulation core is not resistant to some solvent-based adhesive systems, particularly those containing methyl ethyl ketone. Adhesives containing such solvents should not be used in association with this product. Damaged boards or boards that have been in contact with harsh solvents or acids should not be used.
OH&S
Kingspan Insulation products are chemically inert and safe to use. A Product Safety Information Sheet is available from Kingspan Insulation Pty Ltd.
Please note that the reflective surfaces on this product are designed to enhance their thermal performance. As such, the will reflect light as well as heat, including ultraviolet light. Therefore, if these boards are being installed during bright or sunny weather, it is advisable to wear UV protective sunglasses or goggles and if the skin is exposed for a significant period of time, protect bare skin with a UV block sun cream.
Foil facings are conductive to electricity – avoid contact with un-insulated electrical cables and fittings.
Installation must be in accordance with AS 3999 Bulk Thermal Insulation Installation and AS 3000 Electrical Installations (Wiring Rules).
Cutting and Taping
Cutting should be carried out either by using a fine toothed saw, or by scoring with a sharp knife through the insulation and scoring the back of the plasterboard itself, then snapping the board over a straight edge and then cutting the facing on the other side. Ensure accurate trimming to achieve close-butting joints and continuity of insulation. Sheets being cut should be adequately supported to prevent breakage.
When using a fine toothed saw, ensure edges are supported to avoid excessive vibration.
When multiple cuts on a board are required, such as around windows, consider segmenting the board into smaller sections to prevent excessive movement of the board.
Dry Wall Plasterboard
Kingspan Kooltherm® K18 Insulated Plasterboard can be applied utilising a variety of traditional or modern dry-lining techniques, to dry and structurally sound walls. These include traditional fixing to metal or timber frames, metal furring systems or vertical timber batten systems. The particular system employed will depend on the construction or design of the wall to which Kingspan Kooltherm® K18 Insulated Plasterboard is to be fixed. The tapered edge to the plasterboard enables a flat seamless surface equal to traditional plaster finishes after the correct jointing procedures as per plasterboard manufacturer’s recommendation have been completed.
Kingspan Kooltherm® K18 Insulated Plasterboard must be installed in accordance with AS/NZS 2589:2007 Gypsum linings – Application and finishing.
Mechanical Fixing to Timber Joists or Rafters
Side elevation – Raked ceiling with Kingspan Kooltherm K18 Insulated Plasterboard
Side and front elevation – Raked ceiling (exporsed beam) with Kingspan Kooltherm K18 Insulated Plasterboard
Kingspan Kooltherm K18 Insulated Plasterboard may be used to line ceilings or infill where an exposed rafter is desired. Installation is similar to that of standard plasterboard.
- A minimum of 20 mm bearing onto the timbers must be offered at each sheet joint.
- Sheets should be fixed using either drywall screws or suitable galvanised plasterboard nails located at 150 mm centres.
- Ensure fixings are located no less than 10 mm from the edges of the sheet.
- Fixings should be long enough to allow a minimum embedment of 20 mm into the timber.
- Fixings should be driven straight with the heads embedded just below the surface of the sheet. Care should be taken not to overdrive the fixing.
Mechanical Fixing to Metal or Timber Frames/Metal Stud and Track/Battens
Side elevation – Brick veneer wall with Kingspan Kooltherm K18 Insulated Plasterboard
This method may be used on timber frame, metal stud and track constructions or on any dry masonry walls that will support and retain the battens and associated fixings.
- Place framing / battens at a maximum of 600 mm centres and positioned horizontally at floor and ceiling level / horizontal joints to support the Kingspan Kooltherm K18 Insulated Plasterboard.
- Ensure the framing/battens will be wide enough to offer a minimum 20 mm support to all edges of the board.
- Use plasterboard screws long enough to allow for a minimum 20 mm embedment into the stud or, alternatively, suitable galvanised plasterboard nails, should be placed at 200 mm centres and not less than 10 mm from the edges of the board along the line of the studs.
- Drive fixings straight and embed heads just below the surface of the board. Care should be taken not to overdrive the fixing.
- Screws used for plasterboard fixing must comply with AS3566.2:2002 self-drilling screws complying with the building and construction industry corrosion resistance requirements.
Side elevation – Lightweight cladded stud wall with Kingspan Kooltherm K18 Insulated Plasterboard
Mechanical Fixing to Metal Furring Systems
Kingspan Kooltherm K18 Insulated Plasterboard can be fixed by the use of proprietary metal support systems to brick, block,stone or concrete walls. The metal frame should be fixed to the masonry or concrete walls.
- Provide a true and level base for the Kingspan Kooltherm K18 Insulated Plasterboard by fixing the metal frame to the masonry or concrete wall in accordance with the manufacturer’s instructions.
- Set the frame vertically at a maximum of 600 mm centres to coincide with the board joints and the midpoint of the board.
- Fix the Kingspan Kooltherm® K18 Insulated Plasterboard to each metal framing section with self drilling plasterboard screws at 200 mm centres.
- Drive fixings straight and embed heads just below the surface of the board. Care should be taken not to overdrive the fixing.
Management Standards
| Standard |
Management System |
| ISO 9001:2015 |
Quality Management |
| ISO 14001:2015 |
Environmental Management |
| ISO 45001:2018 |
Health and Safety Management |
| ISO 50001:2011 |
Energy Management |
Applies only to the Kingspan Kooltherm K10 insulation board used in the manufacture of this composite insulated plasterboard product.
Product Testing
| Characteristic |
Standard |
Result |
Compressive Stress
(Insulant) |
AS 2498.3 |
Typically exceeds 100 kPa at 10% compression |
| Water Vapour Resistance |
BS EN 12086:1997 / I.S. EN 12086:1998 |
> 35 MN·s/g
For the purpose of calculation of condensation risk, the resistivity of the plasterboard component of the product should be taken as 50MN·s/g·m. |
Fire Performance
| Test |
Test Method |
Result |
Ignitability
Spread of Flame Index
Heat Release
Smoke Development |
AS 1530.3 |
Spread of Flame Index: 0
Smoke Development: ≤ 3 |
| NCC Group Number in accordance with AS 5637.1 |
AS/NZS 3837
/ Amdt 1 |
Group 1** |
| Smoke Obscuration |
AS/NZS 3837 |
< 5m2/kg |
* Applies only to the Kingspan Kooltherm K10 insulation board used in the manufacture of this composite insulated plasterboard product.
** Applies to compliant plasterboard facing.
Environmental Data Table
| Aspect |
Characteristic |
| Recyclability |
Non-contaminated insulation site waste is recyclable, but there are currently no facilities in Australia to process returned material |
| Re-usability |
Re-usable if removed with care (long term of service expected) |
| Water Use |
No water used in Kingspan Insulation’s manufacturing process |
| Blowing Agent Global Warming Potential (GWP) |
Manufactured with a blowing agent that has low GWP |
| Blowing Agent Ozone Depletion Potential (ODP) |
Manufactured with a CFC/HCFC-free blowing agent that has zero ODP |
| Packaging |
Contains 0% recycled product
Polythene wrap and EPS skids 100% recyclable |
