OSB Sheet

Material Composition Assumptions

A standard OSB sheet contains predominantly wood strands comprising approximately 550-585 grams or 85-90% of total mass. The binding system includes resin adhesives such as methylene diphenyl diisocyanate or phenol-formaldehyde compounds representing 52-78 grams or 8-12% by weight. Paraffin wax emulsion provides moisture resistance at 6.5-13 grams or 1-2% of the total composition. Minor processing aids and additives constitute the remaining material fraction. The typical sheet weight used for this assessment is 651 kilograms per cubic meter of finished product.

Manufacturing Geography

North American facilities represent the primary manufacturing region for this assessment due to their established production infrastructure and comprehensive emissions data availability. The regional electrical grid operates at an average carbon intensity of 398 kilograms of carbon dioxide equivalent per megawatt-hour. This region demonstrates favorable emissions characteristics through extensive use of biomass-derived thermal energy, with wood waste providing 95% of process heating requirements. Manufacturing facilities concentrate in areas with abundant softwood forest resources to minimize raw material transportation distances.

Regional Variation

Manufacturing Region	Grid Intensity	Estimated CCI Score	Adjustment vs Default
North America	398 kgCO2e/MWh	30	Baseline
China (OSB/2)	555 kgCO2e/MWh	22	-27%
China (OSB/4)	555 kgCO2e/MWh	56	+87%
European Union	276 kgCO2e/MWh	27	-10%
Scandinavia	134 kgCO2e/MWh	24	-20%

Provenance Override Guidance

1. Factory-specific energy consumption data showing actual electricity usage per cubic meter of production and percentage of thermal energy derived from renewable biomass sources.

2. Transportation distance documentation for wood feedstock procurement including average hauling distances from harvest sites to manufacturing facilities.

3. Adhesive resin supplier environmental product declarations or carbon intensity data for specific binder systems used in production.

4. Regional electricity grid carbon intensity factors for the specific manufacturing location and time period of production.

5. Forest management certification demonstrating sustainable harvesting practices and carbon sequestration accounting methodologies employed.

Methodology Notes

• The CCI score represents cradle-to-gate emissions excluding biogenic carbon storage benefits and end-of-life considerations for a standard density OSB sheet.

• Scope 3 emissions dominate the footprint primarily through upstream forestry operations and raw material acquisition processes rather than manufacturing activities.

• The functional unit assumes one cubic meter of finished OSB product with standard density and performance characteristics.

• Biogenic carbon dioxide emissions from biomass combustion are treated as carbon neutral following established accounting protocols.

• Data gaps include regional variation in adhesive formulations and specific transportation modal choices for finished product distribution.

• Manufacturing electricity consumption averages 134 kilowatt-hours per cubic meter but varies significantly based on facility age and process efficiency.