Form · Sizes pending
Clay-Based — indicative fig. M·43
Fire A2 Non-combustibleEmbodied carbon 0.01kgCO₂e/kg LowCompressive 1.0-5.0MPa StructuralDesign life 30yr
Natural clay-based plaster system for interior and exterior wall finishing with breathable properties
01 Physical
Density 1400-1900kg/m3
Specific gravity 1.4-1.9
Porosity 25-45%
Water absorption 8-25%
Hardness 1.5-2.5Mohs
UV resistance Good
Chemical resistance Poor
pH tolerance 6.5-8.5pH
Surface roughness 50-500um
02 Mechanical
Tensile strength 0.05-0.20MPa
Compressive strength 1.0-5.0MPa
Flexural strength 0.2-0.8MPa
Shear strength 0.05-0.15MPa
Poisson's ratio 0.15-0.25
Impact resistance LowJ
Creep resistance Moderate
03 Thermal
Thermal conductivity 0.50-0.95W/mK
Specific heat 800-1000J/kgK
Thermal expansion 0.005-0.008mm/m/degC
04 Compliance & Fire First question
Combustibility class A2
Fire resistance level 30-60minutes
Ignition temp >800degC
Flame spread index 0
Smoke dev. index <50
Heat release rate <10kW/m2
05 Sustainability & Health
Embodied carbon 0.01-0.06kg CO2-eq/kg
Carbon footprint 0.3-1.8kg CO2-eq/m2
Embodied energy 0.1-0.5MJ/kg
Water footprint 0.5-2.0L/kg
Recyclability 100%
Recycled content 0-100%
Renewable content 5-15%
Circular score 9.5/10
VOC emissions 0ug/m3
Toxicity rating Non-toxic
LEED contribution 2-5points
06 Durability · Cost · Logistics
Expected lifespan 30-100+years
Maintenance interval 3-10years
Warranty period 2-5years
Material cost (range) 15-60AUD/m2
Material cost (per unit) 25-45AUD/m2
Lead time 3-14days
Lifecycle cost 50-200AUD/m2
Annual maintenance 0.50-3.00AUD/m2/year
Market availability Limited-Moderate
07 Assessment
Advantages
- Excellent indoor humidity regulation through hygroscopic moisture buffering
- Extremely low embodied carbon - among lowest of any interior finish
- Zero VOC emissions and completely non-toxic composition
- Fully recyclable and reusable - can be re-wetted and reapplied
- Breathable and vapour-permeable preventing moisture entrapment in walls
- Naturally beautiful aesthetic with wide range of earth-tone colours
- Low energy manufacturing - requires only blending not firing or chemical processing
- Compatible with all earthen and natural building substrates
Constraints
- Vulnerable to sustained water exposure and erosion without protective detailing
- Lower abrasion and impact resistance than cement-based renders
- Requires specialist skills for high-quality decorative finishes
- Drying shrinkage can cause cracking if mix proportions or application technique are poor
- Not suitable for wet areas (bathrooms, kitchens) without waterproof backing
- Limited NCC deemed-to-satisfy provisions requiring performance-based assessment
08 Applications
A1 Interior wall finishing Primary finish coat for interior walls in residential and commercial buildings, providing humidity regulation and aesthetic warmth
A2 Natural building render Render system for straw bale, rammed earth, and earth brick walls providing weather protection and breathable finish
A3 Heritage conservation Like-for-like repair and restoration of historic earth-plastered buildings using compatible traditional materials
A4 Health-conscious interiors Zero-VOC wall finish for buildings prioritising indoor air quality including schools, clinics, and homes for chemically-sensitive occupants
A5 Humidity-regulating finish Hygroscopic wall coating for environments requiring passive humidity control such as museums, galleries, and wine cellars
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.