Strawbale (load-bearing)
Compressed wheat / rye / barley straw bales used as load-bearing wall element. Cheap, locally-sourced, very high biogenic carbon content. FASBA-standardised since 2014.
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Carbon properties
GWP A1–A3 (cradle-to-gate)
-1.35 kgCO2eq/kg
From EN 15804+A2 EPD. Includes biogenic uptake where the EPD reports module D-1 with the biogenic carbon flag.
Biogenic carbon factor
-1.4 kgCO2/kg
Net biogenic carbon per kg of material. Negative = stored. Independent of process emissions.
In-use durability
100 yr
CRCF Carbon Storage Product (≥35 yr)
Eligible
Sink bucket: carbon storage product
Physical and structural
Thermal conductivity
0.052 W/m·K
Density
110 kg/m³
Fire rating (Euroclass)
E
Structural
Load-bearing
Compliance and market
NTA 8230 biobased calc
Compliant
Dutch standard for biobased-share calculation; recognised by partner curators across the EU as the canonical method.
MPG shadow price (NL)
€0.06/m²
Milieuprestatie Gebouwen — Dutch environmental shadow price contribution per m². The closer to zero (or negative), the better the project scores against the Bepalingsmethode.
Supplier capacity (annual)
850,000 tonnes/yr
Aggregate known production capacity across documented producers in this material category.
Certifications
- FASBA (DE)
- Natureplus
- ZAB approved
Sources
- AFASBA (2019). Building with straw — guidelines and certification framework for strawbale construction in Germany and Europe. Establishes lambda, density, fire-rating + structural-design parameters for load-bearing and infill strawbale walls.