Safety Issues of Container Houses

Container houses are not absolutely unsafe, but those that are illegally modified, use inferior materials, or are located in harsh environments have multiple safety hazards. Here is a detailed analysis:

Illegal Modification and Material Hazards

Some container houses are built with flammable sandwich panels (such as polyurethane and polystyrene) to reduce costs, resulting in non-compliant fire resistance ratings. These materials burn rapidly in fires and release toxic smoke, leading to fast fire spread and difficulties in escape. For example, the illegal containers found during the rectification campaign in Danbei Town, Danyang City, commonly had issues such as unauthorized electrical wiring and the mixed use of high-power electrical appliances, posing prominent risks of electric shock and fire. In addition, inferior steel structures are prone to deformation and collapse in fires, and ordinary container houses may lose their load-bearing capacity within about 10 minutes after a fire.

Structural and Installation Defects

Container houses produced by non-standard manufacturers often use thin steel frames with a wind resistance rating of only 6-7, far below the national standard requirement of over 8. In coastal or strong wind areas, these houses are prone to frame deformation and wall cracking. For example, a container house purchased online by a man in Haiyan, Zhejiang, was labeled with a wind resistance rating of 10, but it was actually blown apart in an 8-level wind, exposing the manufacturer's false advertising and structural defects. In addition, the on-site installation of non-prefabricated container houses takes as long as 2-3 days, and the connection joints are prone to loosening, further reducing structural stability.

Environmental and Location Risks

If container houses are located in low-lying areas or open wind gaps, they have insufficient protection against extreme weather conditions (such as heavy rain and strong winds). During the Nagoya Asian Games, the container accommodation area in the port area raised concerns about flooding due to heavy rain, exposing the vulnerability of temporarily built houses to natural disasters. In addition, container houses that illegally occupy collective land, rural roads, or fire lanes not only hinder rescue efforts but may also affect surrounding buildings due to collapse or fire.

Lack of Compliance and Supervision

Some container house manufacturers lack authoritative qualification certifications (such as ISO quality systems and fire performance tests), and their products are difficult to meet national standards for wind resistance, earthquake resistance, and fire resistance. For example, the illegal containers found during the rectification campaign in Danbei Town were mostly produced by unqualified small factories and had issues such as unstable structures and lack of compliance. At the same time, illegally modified container houses are considered illegal buildings and face the risk of forced clearance, resulting in property losses for users.