Will Container Houses Burn?

Container houses can burn under specific conditions, and their fire risk is closely related to materials, design, and usage methods.

1. Materials are the core factor determining fire risk

1. Flammable sandwich materials: To reduce costs, some container houses use flammable materials such as polystyrene and polyurethane foam as sandwich layers. These materials have a low ignition point (about 80℃, they will melt and deform), poor flame retardancy, and will burn rapidly when exposed to open flames, electrical sparks, or high temperatures, releasing toxic black smoke. For example, in a fire in Linping District, Hangzhou in 2025, the flammable materials in a container makeshift house caused the fire to spread, and the homeowner's 150,000 yuan in cash was burned.
2. Application of fireproof materials: Container houses that meet fire protection standards need to use Class A fireproof materials (such as rock wool and fireproof cotton), which can have a fire resistance limit of several hours and effectively prevent combustion. For example, in a fire in the Langfang Industrial Park, some containers were not completely burned because their sandwich layers were made of rock wool (Class A1 non-combustible).

2. Design flaws exacerbate fire hazards

1. Poor structural fire resistance: Container houses are mostly supported by steel structures, but the temperature in a fire can reach 800-1000℃, far exceeding the critical temperature (500℃) at which steel structures lose stability. Ordinary containers may collapse within 10 minutes after a fire, hindering personnel evacuation and rescue.
2. Narrow passageways: Some user units compress the width of safety passageways to expand the usable area, and even build houses by occupying passageways. Once a fire breaks out, thick smoke and high temperatures will quickly block escape routes, increasing the risk of casualties. For example, in a fire in the Binhai New Area, Tianjin, two trapped people died due to blocked evacuation.

3. Improper use causes fires

1. Electrical faults: Unauthorized wiring, the use of inferior electrical appliances, or aging wires are common causes of fires. For example, in a fire in Langfang City, an electrical fault in the switchboard ignited weeds, which then spread to the container.
2. Illegal storage of flammable materials: Stacking flammable and explosive items (such as fireworks and gas cylinders) in containers significantly increases the fire risk. In a fire in Meizhou Bay, Guangdong in 2024, seven boxes of fireworks and explosives in a container exploded, causing the fire to get out of control.

4. Fire prevention suggestions

1. Material selection: Give priority to Class A fireproof sandwich panels (such as rock wool) and avoid using flammable materials such as polystyrene and polyurethane.
2. Electrical safety: Standardize wiring, use national standard wires and install flame-retardant sleeves, and regularly check for wire aging.
3. Safety distance: Maintain a distance of at least 6 meters between container houses to prevent the spread of fire.
4. Fire protection facilities: Equip with smoke alarms, fire extinguishers, and set up emergency escape routes.