Short answer: expanded cork insulation board (ICB) is a rigid board used in insulation projects. CorkMart supplies boards measuring 1000 × 500 mm, in thicknesses from 10 to 150 mm. The right board and thickness depend on the complete wall, roof or floor design and the performance required for the project.
What is expanded cork board?
Expanded cork board is made from expanded cork granules and supplied as a rigid panel. Board formats and declared performance can differ between products. Check the documentation for the specific manufacturer, product reference and thickness you intend to use.
To see how this material fits among other cork products, read Portuguese Cork: What It Is, How It Is Harvested and Why Origin Matters.
Dimensions and pack formats at CorkMart
- Board size: 1000 × 500 mm.
- Area per board: 0.5 m².
- Thicknesses: 10, 15, 20, 25, 30, 35, 40, 50, 60, 75, 80, 100, 125 and 150 mm.
- Pack formats: one board, 5 m² (10 boards), 10 m² (20 boards) or 25 m² (50 boards).
Product documentation and performance
Before using a board in a project with specified performance requirements, confirm the manufacturer and product reference, the technical data for that reference and any applicable declaration of performance. Check thermal conductivity, reaction to fire, moisture behaviour and load resistance against the requirements of the complete construction.
A certification, classification or test result for another board or building system should not be treated as a result for the product you are buying. Contact CorkMart before ordering if your project requires particular declared values or documentation.
Choosing thickness
Thermal resistance is calculated as thickness divided by thermal conductivity: R = d / λ, with d in metres. Use the conductivity declared for the specific board, rather than a generic value for cork. The U-value of the complete wall, roof or floor also depends on its other layers and details.
For a practical planning checklist, read How to Choose Expanded Cork Insulation Board Thickness.
Applications to discuss with your designer or installer
- Roofs: check the insulation position, waterproofing, moisture control, fixings and loads.
- Façades and walls: confirm compatibility with the complete façade or wall system, including fixings and finishes.
- Floors: check loading, screed and finish requirements, and compatibility with any underfloor heating.
- Cold rooms or vibration control: obtain a design and product specification for the particular use; thickness alone does not establish suitability.
Acoustic and fire requirements
For acoustic projects, request results that correspond to the proposed board and construction. Do not infer a sound rating from board thickness alone. For fire requirements, verify the applicable product classification and the requirements of the complete building system with your project designer.
For interior acoustic projects, see Cork Acoustic Panels for Studios, Offices and Home Interiors.
What to check before buying
- Required thickness, based on the project calculation and available space.
- Total area: each board covers 0.5 m²; allow for cuts.
- Applicable product documentation and compatibility with the installation system.
- Fixing method, finishing layers, moisture control and required loads.
- Delivery destination, order size and site access.
Frequently asked questions
What thermal conductivity or fire classification applies?
Use the documentation for the specific board and reference you intend to buy. If these values are required for your project, confirm them with CorkMart before ordering.
How much does a board weigh?
Weight depends on its dimensions and density. Confirm the weight for your selected thickness and quantity when planning handling or delivery.
What thickness do I need?
Choose it from the project's required performance, the board's documented properties and the space available. A designer or installer should confirm the complete build-up.
Explore Expanded Cork Insulation Board or browse Cork Insulation Materials. For project quantities, send your area, thickness and destination through Request a Quote.
