| 1. Inspect the Structural Frame |
Examine the main columns, roof beams, floor frame, welds, hinges, and locking points for distortion, incomplete welds, corrosion, or excessive movement. |
The frame should remain square after folding and unfolding. Load capacity must be supported by engineering calculations for the intended occupancy, location, snow, wind, and seismic conditions. |
Signed structural drawings, design-load calculations, weld inspection records, and a factory assembly or deployment checklist. |
The frame transfers roof, floor, wind, and handling loads. Weak joints or misalignment can cause leaks, deformation, and unsafe operation. |
| 2. Verify the Steel and Surface Protection |
Confirm the steel grade, thickness, galvanizing or coating system, and protection of cut edges, welds, hinges, and fasteners. |
Ask for material certificates and a coating specification suitable for the site exposure. Coating performance depends on preparation, thickness, environment, and maintenance rather than color alone. |
Mill certificates, coating data sheets, measured coating-thickness records, and details of touch-up treatment for damaged areas. |
Moisture trapped at joints and unprotected steel edges are common starting points for corrosion. |
| 3. Compare Wall, Roof, and Floor Materials |
Check panel composition, thickness, density, fire classification, water absorption, floor finish, and the way panels are fixed to the frame. |
For insulated panels, request declared thermal-conductivity or U-value data. The complete wall and roof assembly should be evaluated, including thermal bridges at frames and fasteners. |
Product data sheets, fire-test or classification reports, thermal-performance calculations, and floor loading information. |
Panel quality affects comfort, condensation control, fire safety, durability, and energy use. |
| 4. Test Folding Mechanisms and Seals |
Operate every hinge, telescopic part, latch, door, and window several times. Inspect gaskets and compression seals at folding joints. |
Movement should be smooth, with no binding or uncontrolled drop. Doors and windows should close evenly, and seals should remain compressed without gaps after deployment. |
Factory operation video, deployment instructions, hinge and seal specifications, replacement-part list, and maintenance schedule. |
Folding interfaces experience repeated movement and are among the most likely locations for air leakage and water intrusion. |
| 5. Assess Wind, Snow, Rain, and Temperature Resistance |
Match the house to the local climate, including wind speed, snow load, driving rain, humidity, temperature range, and flood exposure. |
Do not rely on a generic “weatherproof” claim. The design loads and anchoring system should be calculated for the exact site, and the roof should provide positive drainage without standing water. |
Site-specific engineering review, wind and snow-load calculations, anchoring details, water-penetration test results, and roof-drainage drawings. |
A strong shell can still fail if it is poorly anchored, inadequately drained, or installed outside its design climate. |
| 6. Check Foundation, Anchoring, and Installation Needs |
Review ground conditions, level tolerances, foundation points, anchor bolts, utility connections, lifting equipment, and clearance required for unfolding. |
The support system should be level, stable, and designed for the product reactions and local soil conditions. Installation must follow the manufacturer’s sequence and torque requirements. |
Foundation layout, reaction loads, anchor details, installation method statement, lifting plan, and connection diagrams for electrical and plumbing services. |
Uneven supports can twist the folding frame, prevent proper sealing, and transfer unintended loads to panels and hinges. |
| 7. Confirm Compliance, Safety, and Lifecycle Support |
Verify local permits, electrical and plumbing requirements, fire safety provisions, occupant loads, accessibility, warranty terms, spare parts, and service response. |
Compliance is determined by the authority having jurisdiction and the building’s intended use. The contract should define inspection, delivery condition, installation responsibility, exclusions, and maintenance obligations. |
Compliance certificates, electrical test records, fire and smoke documentation, user manual, warranty conditions, inspection plan, and spare-parts availability statement. |
A structurally sound unit may still be unusable or unsafe if it cannot obtain approval or cannot be maintained over its service life. |
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