Expanded Cork Insulation & Façade

Thermacork expanded cork insulation panels are a sustainable and more energy efficient alternative to foam panels. Our cork insulation comes in aesthetically pleasing exterior façade panels that can withstand the elements with little upkeep. Thermacork panels are R-4 per inch, insulating incredibly well despite their mass. Their performance is especially outstanding during rapid changes in temperature from day to night, due to a phenomenon known as thermal delay.

Thermacork is manufactured in Portugal in a carbon negative process that is the definition of green production. The cork dust created by the manufacturing process is burned in a high temperature boiler that generates 90% of the energy needed to produce the cork panels. There are no materials used in the production of Thermacork other than the bark itself and steam.

Cork insulation primarily uses pruned oak branches that are insufficient for use in the wine industry. Wine stoppers cannot be made with the first peel of cork oak, which makes perfect insulation due to its high resin content. The use of first peel cork in Thermacork creates economic incentives to plant more cork oaks in the Iberian Peninsula and North Africa. Thermacork also utilizes post-consumer cork that has been separated from other waste.

Cork oak farming is one of the most green industries there is. In Portugal it is illegal to cut down a cork oak tree, whose bark can be harvested 15-20 times over the course of its 200 year long life. Because cork is harvested by hand, the environmental impact of the industry is incredibly low. Though cork oak forests look dry and desolate, they actually house one of the most biodiverse eco systems in the world.

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Insulation Blocks
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  • Exterior Façade & Cladding
  • Wall Insulation
  • Cork and Lime Plaster EIFS
  • Interior Wall Paneling
  • Sound Attenuation
  • Underslab & Roof Insulation
  • Vibration Control
  • Pour-In Cavity Insulation


  • Red List Free
  • Declare Label
  • 100% Natural
  • Sustainable
  • Made from recycled material
  • No binders or glues
  • VOC Free
  • Class B Fire Rating

Size Options

  • 14.5" x 39" x 1" Insulation
  • 14.5" x 39" x 2" Insulation
  • 14.5" x 39" x 3" Insulation
  • 19.625" x 39" x 1" Insulation
  • 19.625" x 39" x 2" Insulation
  • 19.625" x 39" x 3" Insulation
  • 19.625" x 39" x 1" Facade
  • 19.625" x 39" x 2" Shiplap Facade
  • Pour-In Granules

Also available in 4", 6", 8", 12" thicknesses (Special Order)

Declare Label

Thermacork Declare Label

Product Lines

Facade Grade (MD Facade)

Finer surface. Used to double as insulation and exterior façade.

Technical Information

Density: 140 to 160 kg/m3
Thermal conductivity: 0.040 to 0.042 W/m°C
Excellent performance in wide temperature ranges (-180°C to 120°C)
Compression at 10%: 1.83x104 kg/m3
Water absorption: 0.30 Kg/m2
Excellent acoustic insulation
Compression strength of 15psi (with 10% compression)
Meets fire-safety requirements (Euro Class E) without flame retardants
Vapor permeability

Insulation Grade

Rougher surface. Used for interior wall insulation. Comes in block or granule form.

Technical Information

Thermal Conductivity: 0.036-0.38 W/mk for a declared value of EU label 0.04 W/mk
Thermal Resistance: R-3.6 to R-4.2/inch, declared value for EU label of R-4/inch
Density: 7.0-7.5 lbs/ft3 or 100-120 Kg/m3
Perpendicular Face Resistance:60 Kpa or 8.7 PSI
Compression Resistance: 10% at 100u Kpa (14.5 PSI)
1 1/2" thickness: 2.15 US perms
2" thickness: 2.04 US perms
4" thickness: 1.26 US perms
Maximum Moisture Content: 8%, with water absorption declared at 0.5 kg/m3
Longitude Tolerance: +/-0.1 to 0.2" or +/-3 to 5 mm
Thickness Tolerance: 0.04 to 0.1" or +/-1 to 2 mm
Fire Resistance: Euro Class "E"

Possible LEED® Credits

  • EA1 | 1-20 Points
  • EQ4.4 | 1 Point
  • MR4 | 1-2 Points
  • MR6 | 1 Point
  • MR7 | 1 Point

AIA CE Course

ProductCourse TitleCreditsSign Up
ThermacorkCork as a Sustainable Building Material1 LU - HSWSign Up

Technical Documents

Thermacork Facade Grade CSI SpecCSI SpecDownload (30.09 KB)
Thermacork basic install guidelines 2017Installation GuideDownload (23.86 KB)
Thermacork brochure 2016Catalog/BinderDownload (1.92 MB)
Thermacork Facade Grade Warranty DS SpecialWarranty InformationDownload (30.09 KB)
Thermacork mdfacade basic install guidelines 2017Installation GuideDownload (23.86 KB)

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