Hemp Fibre Batt Insulation, R1.5-R4.0 (90mm, 140mm, 190mm)
Sustainable thermal and acoustic insulation made from 90% hemp fibres with 10% polymer binder, offering R-values of 1.5-4.0 (3.7/inch), negative carbon footprint, and excellent moisture regulation properties
Sustainable thermal and acoustic insulation made from 90% hemp fibres with 10% polymer binder, offering R-values of 1.5-4.0 (3.7/inch), negative carbon footprint, and excellent moisture regulation properties
Hemp fibre batt insulation is a high-performance, sustainable insulation material comprising 90% natural hemp fibres and 10% polymer binder. Available in standard thicknesses of 90mm (R13), 140mm (R20), and 190mm (R28), it provides thermal conductivity of 0.040-0.045 W/mK comparable to conventional glasswool. The material offers exceptional moisture management through vapour permeability of 0.647 Perms, natural pest resistance from high silica content, and carbon sequestration resulting in negative embodied carbon of -0.198 to -2.30 kg CO₂eq/m². Suitable for walls, ceilings, and floors in all Australian climate zones.
- Carbon negative material (sequesters more CO₂ than emitted in production)
- No VOCs or toxic off-gassing
- Natural pest, mould, and mildew resistance
- Excellent moisture regulation without performance loss
- Superior acoustic absorption properties
- Non-irritant installation (no protective equipment required)
- Biodegradable and recyclable
- 10-hour thermal phase shift for temperature stability
- USDA certified biobased material (89.9% organic content)
- 01 Carbon negative material (sequesters more CO₂ than emitted in production)
- 02 No VOCs or toxic off-gassing
- 03 Natural pest, mould, and mildew resistance
- 04 Excellent moisture regulation without performance loss
- 05 Superior acoustic absorption properties
- 01 Higher initial cost than conventional insulation ($1.40-3.10/sq ft)
- 02 Limited Australian suppliers and availability
- 03 Requires import for most products
- 04 Limited Australian fire testing certification
- 05 Installation contractor unfamiliarity
- Density
- 30 – 100 kg/m³ Typical range for batt products, optimal 50-90 kg/m³
- Specific gravity
- 1.48 Hemp fibre specific gravity
- Porosity
- 85 – 95 % High porosity for acoustic and thermal performance
- Water absorption
- 25 – 40 % 24-hour immersion test
- UV resistance
- Moderate Natural lignin provides UV protection
- Chemical resistance
- Good Resistant to mild acids and alkalis
- pH tolerance
- 6 – 10 pH Stable in neutral to slightly alkaline conditions
- Surface roughness
- High µm Fibrous texture
- Tensile strength
- 35 MPa Individual fibre strength
- Compressive strength
- 10 kPa At 10% deformation
- Poisson's ratio
- 0.3 Estimated for fibrous material
- Impact resistance
- Low Compressible material
- Creep resistance
- Good Dimensional stability maintained
- Embodied carbon
- -2.3 – -0.198 kg CO₂eq/m² Cradle-to-gate with carbon sequestration
- Carbon footprint
- -2.3 – -0.198 kg CO₂eq/m² Carbon negative including biogenic carbon
- Embodied energy
- 30 – 35 MJ/kg Low processing energy
- Water footprint
- 2500 L/kg Minimal irrigation required
- Recycled content
- 0 % Virgin hemp fibres
- Renewable content
- 90 % 90% hemp, 10% synthetic binder
- Circular score
- 85 % High due to renewability and end-of-life options
- Combustibility class
- Combustible Requires fire retardant treatment
- Ignition temp
- 250 °C With fire retardant treatment
- Flame spread index
- 25 Class A rating (estimated)
- Smoke dev. index
- 50 Low smoke production
- Heat release rate
- Low Natural fibres with retardant
- Material cost (range)
- 15 – 35 $/m²
- Material cost (per unit)
- 1.75 $/sq ft Average for R13 batts
- Lead time
- 4 – 12 weeks Depends on stock and import requirements
- Lifecycle cost
- 35 – 70 $/m² 50-year analysis including energy savings
- Annual maintenance
- 0 $/m²/year No maintenance required
- Market availability
- Limited Growing but limited Australian supply
- Expected lifespan
- 50 – 100 years With proper installation
- Maintenance interval
- 0 years Maintenance-free
- Warranty period
- 10 – 25 years Manufacturer dependent