Diathonite Thermactive

Applications

Cork-based thermal insulating stucco combining recycled cork, natural hydraulic lime (NHL 5), perlite, cellulose, and pumice into a single machine- or trowel-applied system. Serves as both continuous insulation and a finish-ready substrate for interior plaster or exterior stucco. No foam, no boards, no joints. Ideal for exterior retrofit of masonry and stuccoed properties, and exceptionally well-suited for historic buildings where moisture management is critical.

Advantages

• Made with rapidly renewable recycled cork, natural hydraulic lime, and other natural ingredients; low carbon footprint with no gypsum, cement, or concrete
• Highly vapor permeable with the ability to actively absorb and release moisture, preventing condensation and protecting masonry from long-term moisture damage
• Natural hydraulic lime composition is inherently alkaline, inhibiting mold and fungal growth and supporting healthy indoor air quality
• Monolithic, joint-free application provides superior crack resistance compared to conventional stucco systems
• Extremely lightweight at 15.6 lb/ft³ (250 kg/m³) relative to its insulation value
• Fast to apply by machine or trowel, with a 40-minute workability window
• Two-in-one system: continuous insulation and stucco substrate combined into a single assembly, applicable over existing plaster
  
• Contributes to LEED credits; certified by Indoor Air Comfort® ideal for historic interior restoration and exterior retrofits

Properties

• Expected Thermal Resistance (R): R-3.9 per inch (0.270 m²K/W per cm)
• Expected Thermal Conductivity (λ): 0.243 BTU·in/(hr·ft²·°F) (0.035 W/mK)
  
• Density: 15.6 lb/ft³ (250 kg/m³) (±15%)
• Compressive Strength: 406 psi (2.8 N/mm²) (EN 998-1, Category CS II)
  
• Composition: Recycled cork, natural hydraulic lime NHL 5, expanded amorphous silica, perlite, pumice
• Application: Machine- or trowel-applied; min. thickness 0.6 inch (1.5 cm), max. per layer 1.6 inch (4 cm)