research · CN · Hunan · 2015–

Changsha volumetric assembly speed remains a reported claim

Broad Sustainable Building public materials claim multi-storey assembly in days. Independent timing and whole-system impacts are not in this catalogue.

Speed is not coherence. A fast stack can still be steel- and transport-intensive.

Known

The claim is public and widely circulated.

Inferred

The system is highly volumetric if the published method is accurate.

Estimated

MMC Intensity seed score 88 with 44% evidence confidence.

Unknown

Independent duration, defects, embodied energy, operating energy, fire performance in other jurisdictions.