Technical Information
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Frequently Asked Questions About Shipping Containers
Frequently Asked Questions About Shipping Containers
Shipping containers are today a fundamental building block of global logistics, construction, and alternative architecture. Their technical sophistication, durability, variability, and standardization make them an exceptionally versatile and timeless solution for transportation, storage, and construction. In this comprehensive glossary, you will find answers to the most frequently asked questions, supplemented with deep technical knowledge from leading Czech and international sources.
Basic Concepts and Technical Definitions
What is a shipping container?
A shipping container (also known as an ISO container) is a standardized transport unit designed for intermodal transportation – it can be transported by ship, train, and truck without transshipment. Global standards for containers are established by internationally recognized ISO 668 standards (dimensions and types), ISO 1496 (technical requirements), and ISO 1161 (corner fittings).
Construction characteristics:
- Corner castings: Essential for safe stacking and handling. Must comply with precise ISO 1161 dimensions to enable crane lifting and container connection.
- Load-bearing frame: Welded from Corten steel, ensures high strength when stacking up to 9 containers on top of each other.
- Walls and roof: Profiled steel sheets resistant to deformation and corrosion.
- Floor: Most commonly made of 28mm marine plywood, impregnated against pests and moisture.
Containers are designed to withstand:
- Extreme climatic conditions (salt water, wind, UV radiation).
- Long-term stacking (static load up to 192 tons on the bottom container in a stack of 9 units).
- Rough handling in ports and depots.
What is a container made of?
Material:
- Corten steel (COR-TEN): An iron alloy with additions of copper, phosphorus, silicon, nickel, and chromium. When exposed to weather, it forms a protective patina that prevents deeper corrosion.
- Marine plywood: The floor is composed of hardwoods such as meranti or bamboo, bonded into a thick layer and impregnated to withstand moisture, pests, and chemicals common in cargo transport.
Technical standards:
- All dimensions, strengths, and details are determined by ISO 668, ISO 1496, and ISO 1161 standards.
- CSC (Container Safety Convention) certification guarantees that the container has undergone strict inspection and meets all safety regulations.
What is the lifespan of a container?
The lifespan of a shipping container varies depending on the type of use:
| Type of Use | Expected Lifespan | Note |
|---|---|---|
| Maritime transport | 10–15 years | Intensive loading, salt water, handling |
| Land storage | 30–50 years | With proper maintenance, dry and solid foundation |
| Residential and construction modifications | 30–60 years | After insulation and modifications, protected environment |
Factors affecting lifespan:
- Material quality: Corten steel resists corrosion and mechanical wear better than ordinary steel.
- Maintenance: Regular inspection of paint, seals, rust removal, and dent repair.
- Location: Containers placed on dry, solid ground last significantly longer than those on damp soil.
More on lifespan and maintenance: HZ Containers – Maintenance and Lifespan
Container Types, Variants, and Dimensions
What are the standard container types and dimensions?
Overview of basic types
| Container Type | External Dimensions (LxWxH) mm | Internal Dimensions (LxWxH) mm | Volume (m³) | Payload (kg) |
|---|---|---|---|---|
| 20′ Standard | 6 058 x 2 438 x 2 591 | 5 898 x 2 352 x 2 393 | 33.2 | up to 28 200 |
| 40′ Standard | 12 192 x 2 438 x 2 591 | 12 032 x 2 352 x 2 393 | 67.7 | up to 28 800 |
| 40′ High Cube | 12 192 x 2 438 x 2 896 | 12 032 x 2 352 x 2 698 | 76.4 | up to 28 600 |
| 20′ Open Top | 6 058 x 2 438 x 2 591 | 5 898 x 2 352 x 2 348 | 32.5 | up to 28 000 |
| 40′ Open Top | 12 192 x 2 438 x 2 591 | 12 032 x 2 352 x 2 348 | 66.7 | up to 28 800 |
| 20’/40′ Reefer (refrigerated) | same as 20/40′ | slightly smaller | smaller | up to 29 000 |
Other variants:
- Flat Rack: Without roof and side walls, suitable for heavy/machinery cargo.
- Double Door: Doors on both shorter sides – facilitates loading/unloading.
- Side Door: Doors along the entire length of the longer side – special applications.
- Tank containers: For transporting liquids and chemicals.
Detailed dimensions can be found, for example, on HZ CONTAINERS – shipping container dimensions
New vs. used container
- New (One-Trip): Manufactured in Asia, completes a single journey with cargo. Minimal wear, maximum lifespan.
- Used (Cargo Worthy/WWT): 8–20 years old, guaranteed watertight, may have cosmetic defects (dents, scratches, surface rust), but is structurally sound.
- As-Is: Cheaper, without tightness guarantee, suitable only for non-demanding storage.
Container Delivery, Handling, and Placement
How is container delivery carried out?
- Specialized transport: Most commonly by truck with hydraulic arm (HIAB) or trailer with container frame.
- Handling: Using a crane or forklift, secured by corner castings.
- Access: Must ensure free access for a unit up to 16 m long (for 40′), minimum entrance height 4 m, load-bearing road.
Tips:
- Verify unloading options and site accessibility in advance (trees, poles, electrical lines).
- It is recommended to be present during delivery and precisely specify the placement location.
What is the ideal foundation for a container?
- Solid, level, dry: Concrete, asphalt, paving, compacted gravel. Prevents corrosion and frame deformation.
- Not recommended: Bare soil, grass, soft clay soil.
- Corner support: Concrete tiles, rubber blocks, or wooden beams for leveling and air circulation under the floor.
Permits and Legislation
Do I need a building permit to place a container?
- Temporary structures (storage, workshop, garage): In most cases, a container can be placed on private land without a building permit if it can be quickly removed.
- Permanent structures or change of use: Residential containers, shipping container homes, container houses, offices, workshops – always consult with the local building authority. Notification/building permit and compliance with fire and hygiene standards are required.
- Neighborhood relations: It is recommended to inform neighbors and respect territorial planning.
Maintenance, Lifespan, and Problem Solutions
How to properly maintain a shipping container?
- Regular inspection:
- Condition of paint, rust removal and dent repair, especially in corners and around doors.
- Inspection of door seals and hinges; lubrication 1–2 times per year.
- Prevent water accumulation on the roof (if necessary, slightly slope the roof).
- Repair of surface defects:
- Scratches and rust should be painted with anti-corrosion coating (primer + topcoat for metal).
- Damaged door seals should be replaced.
- Ventilation:
- Ventilate regularly to prevent condensation and mold.
Condensation and how to prevent it
- Ventilation grilles: A standard container has at least 2–4 ventilation openings; additional ones can be added.
- Insulation: Spray PUR foam, mineral wool, sandwich panels – prevent dew formation on walls.
- Moisture absorbers: Bags with silica gel or special dehumidifiers.
- Dry cargo: Do not place damp items, pallets, or goods in the container.
Safety, Modifications, and New Uses
Container safety
- Structural safety: Steel shell with reinforced corners, lockable doors with multiple latches.
- Security: Installation of lock-box (steel cover for padlock), security locks, alarms, or camera systems for valuable contents is recommended.
Container modifications – what is possible?
| Type of Modification | Description and Options |
|---|---|
| Doors and windows | Cutouts, installation of plastic/aluminum frames, safety glass |
| Insulation and cladding | PUR foam, mineral wool, OSB/boards, drywall |
| Electrification | Complete wiring, LED lighting, outlets, distribution panel, air conditioning preparation |
| Heating/cooling | Electric heaters, air conditioning, radiant heaters |
| Social facilities | Toilet, shower, sink, boiler, waste disposal |
| Container connection | Welding into larger units, two-story buildings, modular houses |
| Facade modifications | Wood, metal, composite cladding, green roofs |
Uses of modified containers:
- Mobile offices, changing rooms, social facilities on construction sites
- Residential and recreational houses, cottages, tiny houses
- Warehouses, workshops, garages, garden sheds
- Sales stands, cafes, pop-up shops
- Technology modules, server rooms, energy modules
Purchase, Sale, and Recycling
Where to buy and how does buyback work?
- New containers: Most are manufactured in China and transported to Europe with cargo (ONE-TRIP) and subsequently sold as new.
- Used containers: From decommissioned carrier fleets, through authorized dealers and depots.
- Buyback: Reputable sellers often offer purchase prices according to age, condition, and current demand. Buyback is advantageous for temporary use, such as on a construction site.
Most Common Technical Questions (FAQ in table)
| Question | Answer |
|---|---|
| What is the payload of 20ft and 40ft containers? | Up to 28 200 kg (20ft), up to 28 800 kg (40ft) – depends on type and manufacturer |
| How much does a new/used container cost? | Prices in the Czech Republic: new 20′ from 60 000 CZK, used 20′ from 35 000 CZK, new 40′ from 100 000 CZK, used 40′ from 55 000 CZK (2024) |
| Can containers be stacked on top of each other? | Yes, up to 9 containers, always on solid ground and in accordance with standards |
| What is the tightness guarantee for a used container? | For “WWT” (wind & watertight) guaranteed, “as-is” without guarantee |
| How long does container delivery take in the Czech Republic? | Usually 2–7 business days after agreement |
| Is it possible to transport a container with a regular forklift? | No, a regular forklift is insufficient in payload and dimensions – special transporters are required |
| What does CSC certification mean? | Safety certificate for maritime transport, required for export/import |
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