| Fire-protection classification | GB 50016-2014 Code for Fire Protection Design of Buildings (2018 edition with amendments) | Confirm the building use, number of storeys, floor area, occupancy, fire-risk category, and the required fire-resistance grade. A container-based module should not be treated as automatically compliant only because it is made from steel. | Fire-protection design drawings, material specifications, fire-test reports, and the applicable fire-resistance rating for structural members, walls, floors, roofs, and doors. | Hold if the intended use and fire-resistance grade are not clearly identified. |
| Combustible insulation and interior finishes | GB 50016-2014 Sections concerning building components, insulation materials, and interior decoration | Check the core material of sandwich panels, thermal insulation, ceiling finishes, wall coverings, and floor materials. Verify whether combustible materials require protection or separation under the applicable building category. | Product composition, combustion-performance classification, fire-test documentation, and details showing how insulation is protected at joints, corners, openings, and service penetrations. | Prefer documented non-combustible or appropriately protected assemblies. |
| Fire compartmentation and module connections | GB 50016-2014 | Inspect the fire separation between rooms and connected modules. Pay particular attention to gaps between stacked or joined containers, concealed cavities, wall-to-floor junctions, and penetrations for cables, pipes, and ducts. | Fire-compartment plan, connection details, fire-stopping specifications, approved sealant or collar documentation, and installation procedures. | Hold if module joints or service penetrations are open, unsealed, or undocumented. |
| Escape routes and emergency exits | GB 50016-2014 | Verify the number and location of exits, travel paths, door opening direction, exit accessibility, emergency lighting, and signage according to the actual occupancy and layout. Requirements vary with use, area, storeys, and occupant load. | Floor plans showing escape routes, door and corridor dimensions, emergency-lighting layout, exit-sign specifications, and an occupancy-based fire-safety review. | Accept only when the complete installed layout—not just the empty module—is assessed. |
| Electrical fire safety | GB 50016-2014 and applicable Chinese electrical installation standards | Check cable routing, circuit protection, grounding, residual-current protection where required, distribution-board enclosure, equipment clearances, and protection at wall or floor penetrations. | Single-line electrical diagram, cable and breaker specifications, grounding test record, insulation test record, and electrical installation inspection report. | Reject or rectify installations with unprotected wiring, overloaded circuits, or missing test records. |
| Site-specific basic wind pressure | GB 50009-2012 Load Code for the Design of Building Structures | Determine the project location and the applicable basic wind pressure from the standard’s regional wind-pressure data or an approved site-specific design basis. Do not use one generic wind value for every Chinese location. | Structural design basis stating the site, basic wind pressure w0, reference period, terrain category, and design service conditions. | Require a location-specific value before comparing structural offers. |
| Wind-load calculation model | GB 50009-2012 | Confirm that the design considers the relevant wind-load components and uses the standard parameters for height variation, shape, and gust effects. The commonly used standard expression is wk = βz μs μz w0. | Wind-load calculation sheet identifying βz, μs, μz, w0, pressure zones, load combinations, and governing load cases. | Hold if the supplier provides only a wind-speed statement without calculations. |
| Terrain, exposure, and building height | GB 50009-2012 | Verify the terrain category and surrounding exposure, including open coastal areas, urban areas, hills, and shielding conditions. Confirm the actual installed height, roof form, parapets, canopies, and attachments. | Site plan, elevations, terrain classification, roof and façade drawings, and the wind-pressure distribution used for the design. | The calculation should match the final site arrangement, not only the factory transport configuration. |
| Structural system and local strength | GB 50009-2012 with the applicable structural design standards | Assess the container frame, corner posts, beams, roof, floor, wall panels, openings, lifting points, and any modified sections. Large cut-outs for doors or windows can change the load path and require reinforcement. | Structural drawings, material grades, member calculations, connection details, weld or bolt specifications, and inspection records for modified areas. | Do not approve major openings or stacked units without revised structural calculations. |
| Anchorage and foundation connection | GB 50009-2012 and applicable foundation and structural standards | Check the design against sliding, overturning, uplift, and local bearing. Verify that the anchorage is compatible with the actual foundation, soil conditions, module arrangement, and wind direction. | Foundation plan, anchor-bolt or connector details, uplift and overturning calculations, installation tolerances, and on-site tightening or welding records. | A wind-resistant module is incomplete without a verified site anchorage system. |
| Stacking and inter-module connections | GB 50009-2012 with applicable steel and modular-building standards | For stacked or linked units, verify vertical load transfer, lateral bracing, connector capacity, differential movement, and the effect of openings and service connections. | Stacking configuration, connection drawings, compression and tension checks, lateral-bracing details, and installation sequence. | Reject generic “stackable” claims without configuration-specific engineering. |
| Manufacturing quality and installation control | Project design documents and applicable Chinese construction-quality standards | Confirm that the delivered module matches the approved drawings, especially steel thickness, welds, fire-rated components, insulation, doors, windows, anchors, and electrical equipment. | Material certificates, welding inspection records, dimensional inspection, coating records, factory acceptance checklist, delivery inspection, and installation sign-off. | Use a hold-point inspection before shipment and another after final installation. |
| Final compliance review | GB 50016-2014 and GB 50009-2012, plus local planning, fire, structural, and electrical requirements | Confirm that the design is reviewed for the destination jurisdiction. Local authorities may require additional requirements based on climate, seismic conditions, occupancy, site use, and permitting status. | Stamped design documents where required, code-compliance statement, permit documentation, fire-safety review materials, structural review materials, and completion inspection records. | Choose the home only after destination-specific professional review. |