When a building exceeds the height limits addressed by QCVN 06:2022/BXD — generally understood as approximately 150 m — the design team must prepare a technical justification report for the application of a foreign fire code such as NFPA 5000 or BS 7974. Under Fire Safety Law 55/2024 and Decree 105/2025, the post-inspection model allows greater flexibility — but demands a well-constructed dossier that can withstand scrutiny from the competent authority at any time.
1. QCVN 06:2022 and its height limitations
QCVN 06:2022/BXD is the primary Vietnamese national technical regulation for fire safety in buildings and structures. However, the regulation has height-based limitations — super high-rise buildings (generally accepted as above 150 m) fall into a zone that is "not fully covered," particularly with respect to:
- Refuge floors — location, minimum floor area, and technical requirements
- Fire-service lifts and evacuation lifts for persons with disabilities
- Emergency communications and incident coordination systems
- Smoke control zone-by-zone across pressure-differential compartments
Under current Vietnamese fire safety regulations, projects may be permitted to apply foreign standards in cases where no equivalent Vietnamese standard exists, or where the foreign standard provides a higher level of safety. A technical justification report is ordinarily required. Please consult current legislation and guidance from the competent authority for your specific project.
2. Why NFPA 5000 is preferred for super high-rise buildings
NFPA 5000 (Building Construction and Safety Code) is NFPA's comprehensive building code, closely integrated with NFPA 101 (Life Safety Code). The reasons NFPA 5000 is favoured for super high-rise projects in Vietnam:
| Criterion | NFPA 5000 | BS 7974 | QCVN 06 |
|---|---|---|---|
| Height coverage | Unlimited | Unlimited (PBD) | Limited ~150 m |
| Refuge floors | Specific requirements every 25 storeys | PBD analysis | Not fully specified |
| Evacuation simulation | Permitted and encouraged | Core methodology | Not specified |
| Evacuation lifts | Chapter 9 — detailed requirements | PBD analysis | Being updated |
| Integration with Vietnamese PCCC | High — multiple precedent projects | Medium | N/A |
3. Technical justification report — step-by-step process
Compare each QCVN 06 clause against NFPA 5000: identify provisions where QCVN already applies (use QCVN), provisions where QCVN is absent or insufficient (apply NFPA 5000), and provisions where the two conflict (requiring detailed technical analysis).
Define representative fire scenarios for the building: a fire on a typical floor, a fire in a plant room, a fire in a retail tenancy (if applicable), and a fire in the basement. Each scenario requires FDS fire simulation and Pathfinder egress modelling to demonstrate ASET > RSET.
The report must present: the legal basis, the methodology, simulation results, a comparison against QCVN requirements, and a conclusion on equivalent or superior safety performance. Bilingual format (VI/EN) is required when international consultants are involved.
Under Fire Safety Law 55/2024, the dossier does not need to be submitted before construction begins, but must be ready to present to the fire authority on demand. The dossier includes: calculations, simulation files, design drawings, equipment certificates, and the gap-analysis matrix.
4. Key engineering requirements for buildings above 150 m
| Element | NFPA 5000 requirement |
|---|---|
| Refuge floors | Every 25 storeys; floor area ≥ 0.28 m²/person (NFPA 5000 Ch. 11) |
| Evacuation lifts | Fire-rated shaft, dedicated power supply, two-way communication; capacity per NFPA 5000 Ch. 9 |
| Stair pressurisation | NFPA 92 — 12.5 Pa to 62 Pa; tested with all doors closed and with doors open |
| Smoke exhaust | NFPA 92 — zone-by-zone, mechanical, CFD validated where atria or open floor plans are involved |
| Sprinkler system | NFPA 13 — high-rise package including seismic restraint |
| Fire command centre | Dedicated room; direct voice communication to all areas; fire service access |
Frequently Asked Questions
Is fire simulation (FDS) mandatory for all buildings over 150 m in Vietnam?
FDS simulation is not explicitly mandated by QCVN 06. However, when a technical justification report is required — as is typically the case for super high-rise buildings that fall outside QCVN 06's scope — fire and smoke simulation (FDS/PyroSim) and egress modelling (Pathfinder) are the established engineering tools used to demonstrate ASET > RSET and support the technical arguments in the dossier.
Can NFPA 5000 fully replace QCVN 06 for a Vietnamese project?
No. NFPA 5000 is applied as a supplementary reference for areas where QCVN 06 does not provide sufficient guidance — for example, refuge floors and evacuation lift design for super high-rise buildings. Provisions that QCVN 06 covers adequately are still applied as the primary reference. The technical justification report must clearly document which standard governs each design element.
Need a technical justification report for a super high-rise project?
VIETSAFE E&C prepares gap-analysis matrices, FDS/Pathfinder simulations, and complete bilingual technical justification dossiers.
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