Ocean freight is where months of engineering and fabrication can be undone in a single container shift or a week of condensation. Curtain wall and window modules—unitized panels, stick components, operable sash assemblies—demand discipline at every step from factory floor to site laydown. This guide covers the packing methods, moisture control protocols, documentation habits, and damage-prevention strategies that keep facade modules installation-ready through weeks at sea and multiple handling events.
JUHEMZENITH ships unitized curtain wall, fixed and operable windows, and stick-system components from Foshan to projects across North America, the Middle East, and Southeast Asia. The practices below reflect what works in high-humidity factory environments, mixed-container loads, and job sites with limited staging space.
Choosing the right packing structure depends on module weight, glass size, frame profile stiffness, and whether the installer plans to lift modules directly from shipping frames or transfer to site racks.
Best for: Unitized curtain wall panels with IGUs up to 2.4 m × 1.8 m, 150–350 kg per module.
A-frames hold modules vertically at 5–7° tilt, glass face inward. Foam or rubber separators prevent glass-to-glass contact. Frames bolt or weld to container D-rings and stack two-high in a 40' HC. Installers can sling-lift modules directly from the A-frame to the hoist, reducing double-handling.
Pros: Fast unloading, reusable frames, minimal site unpacking labor.
Cons: Higher tare weight (~200 kg per A-frame), requires return logistics or frame deposit, not suitable for modules with projecting fins or deep mullion caps.
Best for: Oversized fixed lites, shaped or curved panels, modules with applied spandrel finishes that cannot touch neighboring units.
Each module sits in a dedicated plywood box with internal bracing. Foam or cardboard edge guards wrap all four sides. Crates stack flat or on edge depending on module aspect ratio. Use heat-treated (HT) or fumigated (MB) lumber per ISPM-15 for all destination markets.
Pros: Maximum protection for one-off geometry, easy to label and route individually, absorbs minor forklift impacts.
Cons: High cubic volume (lower modules per container), labor-intensive unpacking, crate disposal at site, higher freight cost per module.
Best for: Operable window sash, storefront fixed lites under 1.2 m width, aluminum extrusion bundles.
Timber cradles with foam-lined saddles hold units horizontally. Plastic or plywood separators every 50–100 mm. Entire rack straps to pallet base and lifts as one piece. Works well for mixed loads where modules vary in size.
Pros: Low-cost, disposable at destination, easy to configure for mixed SKU orders.
Cons: Modules cannot be lifted individually without unpacking, risk of edge compression if strapping is over-tensioned, less stable in rough seas.
| Method | Module Type | Unload Speed | Reusability | Container Efficiency |
|---|---|---|---|---|
| Steel A-frame | Unitized CW panels | Fast | High | Medium |
| Wooden crate | Curved, oversized, or shaped | Slow | None | Low |
| Horizontal rack | Small operable, storefronts | Medium | Low | High |
Facade modules travel from Foshan's subtropical factory climate (annual average ~75% RH) through container yard heat, two to four weeks at sea, and discharge into climates ranging from Gulf humidity to prairie cold. Every aluminum frame, EPDM gasket, and insulating glass seal sees condensation risk.
Place silica gel or clay desiccant bags (minimum 1 kg per cubic meter of enclosed volume) inside each crate or rack. Bags go at the top and bottom of vertical A-frames; condensation runs down, and bottom desiccant catches it. Replace bags if packing happens more than 48 hours before container stuffing—factory air recharges them quickly.
Wrap each module in PE film or shrink-wrap before racking. Leave a small vent gap at the top to prevent internal pressure build-up during temperature swings. Do not use PVC wrap in direct contact with powder-coat or anodized finishes; plasticizer migration can leave marks.
For modules with exposed aluminum extrusions, stainless steel brackets, or carbon-steel structural reinforcement, insert VCI paper or emitter sachets inside the wrap. VCI releases a molecular layer that passivates metal surfaces. Particularly useful for projects shipping to coastal sites where containers sit in open yards for weeks before inland transport.
All glass edges receive foam or rubber edge guards, minimum 10 mm thick, taped or clipped in place. Corner protectors (L-shaped foam or cardboard) go on all four corners of rectangular lites. For laminated or tempered glass with polished edges, use felt-lined guards to prevent abrasion.
Aluminum frame corners get corrugated corner caps, especially on anodized or PVDF finishes. A single forklift tine scrape can reject a module at receiving inspection.
Leave factory-applied PE protective film on aluminum frames and glass until installation. If film is not UV-stable, mark crates "DO NOT STORE OUTDOORS" and plan for covered laydown at destination. Film that bakes on under sun becomes harder to remove than the scratches it prevents.
A container with thirty A-frames holding ninety modules needs a routing and identification system that survives two port transfers, a cross-dock, and a muddy laydown yard.
Each module and its packing frame get three labels minimum:
Print labels on weather-resistant stock or laminate paper labels. Include a QR code linking to the packing list or module shop drawing if the GC uses digital check-in systems.
Mark glass face clearly: "GLASS FACE INWARD" or "GLASS FACE TO WALL" depending on rack orientation. On mixed-module A-frames, label each slot position (A1, A2, etc.) and match to the container loading plan.
Prepare a plan showing:
Send the plan to the GC and receiving warehouse minimum 72 hours before vessel ETA. Include it in the commercial invoice packet and as a PDF attachment to the bill of lading.
The packing list is the field document. For each container, list:
Include a separate hardware and accessory list for anchors, shims, sealant, and gaskets shipped loose in boxes.
Damage falls into three categories: impact, moisture, and load shift. Each has a packing countermeasure.
Cause: Forklift strikes during stuffing or devanning, container stacking forces, rough handling at transshipment ports.
Prevention:
Cause: Condensation cycles when container crosses climate zones, direct water ingress from deck cargo or hatch cover leaks.
Prevention:
Cause: Insufficient lashing, undersized dunnage, rough seas, emergency maneuvering.
Prevention:
| Method | Glass Breakage Risk | Frame Damage Risk | Moisture Risk |
|---|---|---|---|
| Steel A-frame | Low | Low | Medium |
| Wooden crate | Very Low | Very Low | Low |
| Horizontal rack | Medium | Medium | Medium |
Marine cargo insurance pays for replacement only if you can prove the loss occurred in transit and that packing met industry norms. Document as if you expect to file a claim—because statistically, on multi-container facade projects, you will.
Before wrapping and crating:
Store photos in cloud folder organized by container and module mark. Share access link with GC and insurance broker.
During packing:
These photos prove compliance with packing standards and shift liability to carrier or port operator if damage occurs.
GC or installer performs receiving inspection within 24 hours of container arrival. Photograph:
File notice of claim with carrier within 72 hours. Provide packing list, loading plan, pre-shipment photos, and receiving photos. Do not dispose of damaged modules or packing materials until surveyor inspection.
Request "All Risks" marine cargo policy (Institute Cargo Clauses A), minimum coverage 110% of CIF value. Confirm policy covers:
Attach certificate of insurance to shipping documents. Many destinations require the certificate before containers leave the CY. Keep the policy, packing list, bill of lading, commercial invoice, and pre-shipment photo index in one export package so claims and receiving teams work from the same file set.
Treat logistics as a critical path equal to production. A practical sequence for overseas facade modules:
| Stage | Typical planning note | Owner |
|---|---|---|
| Production complete / factory QC release | Lock packing list and module marks | Manufacturer |
| Packing, crating, desiccant, labeling | Allow days for glass-sensitive loads | Manufacturer |
| Inland haul to port / CY cut-off | Book space early in peak seasons | Forwarder + manufacturer |
| Ocean transit | Route and vessel schedule drive buffer | Carrier / forwarder |
| Destination clearance and drayage | Documents must match packing marks | Importer / GC |
| Site landing and incoming inspection | Hold install until ITP checks pass | GC / installer |
Build float for weather delays at origin and destination, glass remakes, and customs queries. Share a living milestone calendar so the site team knows when laydown, crane, and storage protection must be ready—not after the first container arrives.
Ready to discuss factory-ready delivery for your project? Reach the JUHEMZENITH export team:
