Block · Sizes pending
Stone — indicative fig. M·120
Fire A1 A1 Non-combustibleEmbodied carbon 0.09kgCO₂e/kg LowCompressive 12-150MPa StructuralDesign life 50yr
Natural limestone blocks and panels for structural and cladding applications with various surface finishes
01 Physical
Density 1760-2700kg/m3
Specific gravity 1.76-2.70
Porosity 1-30%
Water absorption 1-12%
Hardness 3-4Mohs
UV resistance Excellent
Chemical resistance Poor (acids); Good (alkalis)
pH tolerance 7-14 (dissolves below pH 7)pH
Surface roughness 0.5-500 (finish-dependent)um
02 Mechanical
Tensile strength 2-10MPa
Compressive strength 12-150MPa
Flexural strength 2.9-15MPa
Shear strength 5-25MPa
Poisson's ratio 0.20-0.30
Impact resistance 2-6J
Creep resistance Good
03 Thermal
Thermal conductivity 0.5-1.8W/mK
Specific heat 840-910J/kgK
Thermal expansion 0.004-0.008mm/m/degC
04 Compliance & Fire First question
Combustibility class A1 Non-Combustible
Fire resistance level 120+ (200mm blockwork)minutes
Ignition temp N/A (does not ignite)degC
Flame spread index 0
Smoke dev. index 0
Heat release rate 0kW/m2
05 Sustainability & Health
Embodied carbon 0.09-0.22kg CO2-eq/kg
Carbon footprint 7-88 (thickness-dependent)kg CO2-eq/m2
Embodied energy 0.85-1.5MJ/kg
Water footprint 5-15L/kg
Recyclability 100%
Recycled content 0 (primary stone)%
Renewable content 0%
Circular score 7.0/10
VOC emissions 0ug/m3
Toxicity rating Non-Toxic
LEED contribution 3-6points
06 Durability · Cost · Logistics
Expected lifespan 50-500+years
Maintenance interval 1825-3650 (5-10 year exterior inspection)days
Warranty period 5-10 (product liability)years
Sound absorption Low (dense); Moderate (cellular)
Material cost (range) 30-400AUD/m2
Material cost (per unit) 60-120AUD/m2
Lead time 5-120days
Lifecycle cost 300-600 (over 100 years)AUD/m2
Annual maintenance 1-10AUD/m2/year
Market availability Excellent (SA/WA); Good (national)
07 Assessment
Advantages
- Non-combustible (A1) with CSIRO-tested FRL data for Australian applications
- Excellent thermal mass — moderates internal temperature swings in passive design
- Mount Gambier cellular limestone: thermal insulation 3x that of clay brick
- Competitive cost — approximately one-quarter the price of sandstone, comparable to brick-and-render
- Low embodied energy — quarried and cut, no firing or chemical processing
- Attractive natural appearance that weathers gracefully over decades
- Load-bearing capability — can be structural in low-rise construction (no separate frame needed)
- Good acoustic isolation — cellular structure absorbs sound
Constraints
- Acid-sensitive — calcium carbonate dissolves in acid rain and acidic cleaning products
- Porous varieties (Type I) absorb water and stain readily if unsealed
- Softer than granite and marble — scratches and wears in high-traffic areas
- Heavy — blockwork approximately 40-65 kg per block, requires crane/forklift for upper-storey work
- Limited compressive strength in porous varieties (Type I: 12 MPa minimum)
- Salt crystallisation damage in coastal environments (porous varieties)
- Fossil content can create weakness planes in structural applications
08 Applications
A1 Residential Blockwork Load-bearing limestone block construction for houses and low-rise residential buildings — a strong South Australian and Western Australian building tradition
A2 Exterior Wall Cladding Limestone panels or split-face blocks applied as cladding to structural frames for commercial and residential facades
A3 Retaining and Boundary Walls Limestone block retaining walls and property boundary walls — popular in South Australian and Western Australian landscaping
A4 Interior Feature Elements Limestone feature walls, fireplace surrounds, and decorative elements providing natural stone character in interior spaces
A5 Floor Tiles and Paving Honed or bush-hammered limestone tiles for interior flooring and exterior paving in residential and commercial applications
09 Sources & Standards
Sources pending — citations for this material are not yet recorded. Verify all figures against manufacturer data and current standards before specifying.