Cork Board Insulation is a natural, breathable, and renewable insulation board made entirely from 100% cork, offering superior thermal and acoustic performance without compromising the integrity of solid-walled buildings. Perfectly suited for internal wall insulation (IWI) on stone, brick, or lime-based masonry, cork boards are chemical-free, vapour-open, and ideal for heritage and sustainable construction.
Harvested every 9 years from cork oak trees without harming the tree, cork is eco-friendly, durable, and contributes to healthier, more efficient buildings.
Key Features
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100% Natural Cork – No synthetic binders, VOCs, or chemical additives
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Thermal Conductivity: λ = 0.036 – 0.040 W/m·K
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Excellent Sound Insulation – Dense structure reduces airborne noise
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High Vapour Permeability – Maintains breathability in solid masonry
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Resistant to Rot, Mould & Pests – Long-term resilience and stability
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Board Size: 500mm x 1000mm
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Available Thicknesses: Multiple (pack quantities vary by thickness)
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Recyclable & Compostable – Environmentally responsible at end of life
Internal Wall Insulation for Solid Masonry Walls
Cork Board is an excellent choice for retrofit or conservation-focused insulation where moisture buffering, breathability, and thermal improvement are essential. It prevents cold wall effects, avoids condensation risks when correctly detailed, and enhances indoor comfort—especially in solid stone or brick walls.
Typical Internal Wall Build-Up with Cork Insulation
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Masonry wall levelled with Tector® Natural Base hydraulic lime render
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Cork boards (thickness as required) adhered with Secil Isovit adhesive
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A 6mm layer of Secil Isovit render, with fibreglass mesh embedded
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Finished with a 2mm skim coat of Roundtower Heritage Lime Skim for a smooth, breathable interior surface
This breathable build-up is ideal for:
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Heritage buildings and listed properties
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Solid-walled homes with moisture sensitivity
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Natural building projects requiring low-impact materials
Other Applications
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Pitched and flat roofs (internal and external)
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Under screeds, floors, and joist cavities
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Service zones, partitions, and acoustic barriers
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Façade insulation (ETICS / EIFS or ventilated rain-screen systems)
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Vibration isolation (machinery, HVAC, pipework)
Environmental Benefits
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Carbon-Negative – Cork trees sequester CO₂ during growth
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Plastic-Free, Zero VOC – Healthy indoor air quality
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Sustainably Harvested – Regrows every 9 years
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Fully Biodegradable & Recyclable
Cork Board Insulation is the ideal solution for builders, designers, and conservationists seeking a natural, breathable insulation that complements solid masonry construction—delivering long-term thermal comfort without compromising the building's ability to manage moisture.
