Container House Certificate of Conformity
The certificate of conformity for container houses should include quality acceptance certificates for material quality, factory production quality, and on-site installation quality, and should comply with national and industry standards, such as T/CECS 1932-2025 'Quality Acceptance Standards for Container Houses'. Specific requirements are as follows:
I. Core Content of the Certificate of Conformity
The certificate of conformity for container houses should clearly demonstrate that the house has passed quality acceptance in three stages: material, factory production, and on-site installation. Material quality acceptance covers steel, accessories, etc., and requires the provision of steel yield strength data (not less than 345MPa), rock wool sandwich panel Class A combustion performance test reports, etc. Factory production quality acceptance requires confirmation that the box structure has full welds and complete and reliable corner fittings. On-site installation quality acceptance requires ensuring that the corner fittings and corner columns of multi-story stacked boxes are aligned and locked vertically, and that the lateral force-resisting members are symmetrically arranged in the plane.
II. Correlation Between the Certificate of Conformity and Standards
The certificate of conformity must strictly correspond to current standards. For example, the T/CECS 1932-2025 standard requires that the factory certificate of conformity be linked to on-site sampling inspections, and project parties must verify indicators such as the combustion performance of rock wool sandwich panels and the yield strength of steel on an item-by-item basis. Previously, some projects only required material certificates, but after the implementation of the new regulations, the certificate of conformity must include more detailed quantitative data, such as the fire-resistant material's combustion performance meeting the fire resistance limit specified in GB50016 (commonly required to be ≥0.5h).
III. Verification Methods for the Certificate of Conformity
Project parties can verify the certificate of conformity by checking the certificate label and verifying the authenticity of the test reports. For example, high-quality color steel plates should have a base plate thickness of 0.025~0.055mm, a film thickness of ≤0.155mm, and the internal material of the cross-section should be finely crystallized and free of impurities. In addition, the certificate of conformity should be cross-verified with BIM models, production key process records, and other documents to ensure quality traceability.
IV. Risks of Having No Certificate of Conformity
If a container house has no certificate of conformity or the content of the certificate is incomplete, there may be structural safety hazards (such as corner fitting defects leading to stack load transfer failure) and fire non-compliance (such as the use of EPS flammable core materials). For example, the container houses in Haiyan, Jiaxing were damaged in an 8-level gale, partly due to substandard quality, and the certificate of conformity is an important basis for avoiding such risks.
