Nominal fire resistance limit of external wall structures in fire safety in Vietnam
Based on Table F.3, Section F.1, Appendix F of the National Technical Regulation on Fire Safety for Buildings and Constructions issued together with Circular 02/2021/TT-BXD, the regulation on the nominal fire resistance limit of external wall structures is as follows:
Table F.3 - External Walls (non-load-bearing)
| Structure and Materials | Fire Resistance Limit |
| (1) | (2) |
| 1. Walls with a steel skeleton frame, the outer layer made of non-combustible material sheets, and the inner layer is: | |
| a) 12.5 mm thick cement sand or gypsum plaster on steel lath | EI 240 |
| b) Two 9.5 mm thick panels | EI 30 |
| c) 9.5 mm thick panel with 12.5 mm thick gypsum plaster | EI 30 |
| d) 12.5 mm thick panel with 5 mm thick gypsum plaster | EI 30 |
| e) 50 mm thick rice husk board | EI 30 |
| f) 50 mm thick rice husk board with 5 mm thick gypsum plaster | EI 120 |
| 2. Walls with a wooden skeleton frame, the outer layer is 10 mm thick cement sand or cement-lime ^1)^ and the inner layer is: | |
| a) 16 mm thick gypsum plaster on steel lath | EI 60 |
Table F.3 (conclusion)
| (1) | (2) |
| b) 9.5 mm thick panel with 12.5 mm thick gypsum plaster | EI 60 |
| c) 12.5 mm thick panel with 5 mm thick gypsum plaster | EI 60 |
| d) 50 mm thick rice husk board | EI 60 |
| e) Autoclaved aerated concrete block with a thickness of: | EI 180 |
| 50 mm | |
| 62 mm | EI 240 |
| 75 mm | EI 240 |
| 100 mm | EI 240 |
| 3. Walls with a wooden skeleton frame, the outer layer is 100 mm thick brick or blocks made from fired clay, concrete, the inner layer with 16 mm thick gypsum plaster on steel lath | EI 240 |
| 4. Walls with a wooden skeleton frame, the outer layer is edge-overlapping panels or 9.5 mm thick plywood ^1^^)^ and the inner layer is: | |
| a) 16 mm thick gypsum plaster on steel lath | EI 30 |
| b) 9.5 mm thick panel with 12.5 mm thick gypsum plaster | EI 30 |
| c) 12.5 mm thick panel with 5 mm thick gypsum plaster | EI 30 |
| d) 50 mm thick rice husk board | EI 30 |
| e) Autoclaved aerated concrete block with a thickness of: | |
| 50 mm | EI 180 |
| 62 mm | EI 240 |
| 75 mm | EI 240 |
| 100 mm | EI 240 |
| ^1)^ The presence of membranes that can form combustible vapors within the thickness of these structures should not contribute to their fire resistance. | |
| NOTE: Principles for determining the fire resistance limits of structural elements see 2.3.2. |
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