The detachable container house (often referred to as a knock-down container house or bolt-connected modular container) is engineered for one primary economic objective: maximizing international sea freight efficiency and lowering the landed cost per square meter. While standard flat-pack container houses ship with factory-welded roof and floor cassettes (limiting 40HQ container capacity to 6-8 units), detachable container units disassemble every structural element into loose profiles: top frame longitudinal and transverse beams, bottom chassis girders, corner posts, secondary purlins, and wall panels. This completely knock-down architecture allows an extraordinary 12 to 15 complete 20ft container houses to pack into a single 40ft High Cube (40HQ) shipping container.
For international contractors bidding on large-scale infrastructure projects, mining concessions, oil & gas pipeline corridors, and post-disaster reconstruction programs where hundreds of housing units must be transported across continents, detachable container housing slashes ocean logistics costs by more than 50% compared to any other modular building system.
Manufactured at Sino East Steel Group’s Tianjin production base, our detachable container units combine precision roll-formed Q235B galvanized structural steel, hot-dip zinc corrosion protection, and high-tensile bolted connections, providing a robust, relocatable, and cost-effective modular building system with a design service life of 15 to 20 years.
Table of Contents: Detachable Container House Guide
- 1. Dimensions, Specifications & Structural Components
- 2. 40HQ Sea Freight Packing Economics (12-15 Units/Container)
- 3. Steel Frame Fabrication & Corner Joint Engineering
- 4. Sandwich Panel Wall & Roof Insulation Options
- 5. Step-by-Step On-Site Assembly Process & Tooling
- 6. Detachable vs. Flat-Pack: Detailed Comparison for Buyers
- 7. Primary B2B Applications (Worker Camps, Site Dorms, Resettlement)
- 8. Factory-Direct FOB Pricing & Order Tiers
- 9. Request Engineering Drawings & Factory Quotation
- 10. Frequently Asked Questions (FAQ)
1. Dimensions, Specifications & Structural Components
A standard 20ft detachable container house shares the exact exterior footprint of an ISO shipping container, ensuring complete compatibility with modular site master plans:
| Component / Parameter | Standard 20ft Specification | Heavy-Duty Mining Specification |
|---|---|---|
| External Dimensions (L × W × H) | 5950 × 2438 × 2800 mm | 5950 × 2438 × 2896 mm (High Cube) |
| Internal Dimensions (L × W × H) | 5750 × 2238 × 2550 mm | 5750 × 2238 × 2650 mm |
| Internal Usable Floor Area | 14.20 m² (152.8 sq ft) | 14.20 m² (152.8 sq ft) |
| Unit Weight (Complete Unit) | 1,350 kg ± 40 kg | 1,550 kg ± 50 kg |
| Floor Live Load Capacity | 2.5 kN/m² (250 kg/m²) | 3.0 kN/m² (300 kg/m²) |
| Roof Live Load Capacity | 1.0 kN/m² (100 kg/m²) | 1.5 kN/m² (150 kg/m²) |
| Wind Load Rating | 110 km/h (Grade 10-11 wind) | 130 km/h (Grade 12 typhoon resistant) |
| Seismic Resistance Grade | Grade 7 Earthquake Intensity | Grade 8 Earthquake Intensity |
2. 40HQ Sea Freight Packing Economics (12-15 Units/Container)
For international buyers, the defining competitive advantage of detachable container housing is logistics optimization. In high-volume procurement, ocean freight often rivals the factory purchase price of modular units if packing density is low.
Packing Breakdown in a 40ft High Cube Container
- Steel Frame Bundles: Main top beams, bottom beams, and corner columns are nested into dense steel bundles bound with high-tensile steel strapping.
- Floor & Roof Joists: Pre-cut secondary square tubes and C purlins pack tightly into the frame cavities.
- Wall Panels: Sandwich panels are stacked flat on heavy-duty wooden shipping pallets protected with plastic film and edge guards.
- Accessories & Hardware: Aluminum sliding windows, security doors, PVC flooring rolls, electrical harnesses, and structural bolt kits are packed into dedicated accessory crates.
40HQ Sea Freight Loading Comparison:
- Detachable Container (50mm Panels): 15 Units / 40HQ (Average Freight: ~$230 / unit).
- Detachable Container (75mm Rockwool): 12 Units / 40HQ (Average Freight: ~$290 / unit).
- Flat-Pack Container: 6 – 8 Units / 40HQ (Average Freight: ~$440 – $580 / unit).
- Fully Assembled Container: 2 Units / 40HQ (Average Freight: ~$1,750 / unit).
3. Steel Frame Fabrication & Corner Joint Engineering
The structural strength of detachable container houses relies on precision cold-roll-formed steel members and high-strength mechanical bolted joints:
Primary Structural Members
- Bottom Chassis Longitudinal Beams: 2.5mm – 3.0mm Q235B cold-formed galvanized channel (160mm × 50mm) with pre-punched bolt holes for floor joist mounting.
- Top Roof Longitudinal Beams: 2.5mm – 3.0mm Q235B galvanized steel beam with integrated exterior rain-shedding drip ledge.
- Corner Columns: 2.5mm – 3.0mm press-formed galvanized structural steel corner profiles (160mm × 160mm) with multi-point bolt flanges.
- Floor Joist Sub-Structure: 80 × 40 × 1.8mm galvanized rectangular hollow sections (RHS) spaced at 350mm intervals, providing firm support for 18mm MGO or fiber cement subfloor boards.
- Secondary Roof Purlins: 40 × 40 × 1.5mm galvanized steel square tubes supporting 0.45mm corrugated galvanized color-coated roof sheets and 50mm glasswool insulation quilt with aluminum foil vapor backing.
Heavy-Duty Bolted Corner Connections
Unlike welded containers, detachable units use precision laser-cut corner connecting plates (6.0mm – 8.0mm structural steel plate) and high-tensile Grade 8.8 galvanized structural bolts. This mechanical joint eliminates the need for any on-site welding or specialized welding labor during camp construction.
4. Sandwich Panel Wall & Roof Insulation Options
Detachable container houses utilize modular tongue-and-groove sandwich panels (standard width 1150mm) engineered for fast slot-in installation:
| Panel Core Material | Standard Thickness | Fire Rating | Density | Key Project Suitability |
|---|---|---|---|---|
| Class A1 Rockwool Panel | 50mm / 75mm / 100mm | Class A1 (Non-combustible) | 80 – 120 kg/m³ | Mining camps, oilfield accommodations, government worker dorms requiring strict fire compliance. |
| Polyurethane (PIR / PU) | 50mm / 75mm | Class B1 (Flame-retardant) | 38 – 42 kg/m³ | Extreme heat/cold environments, low-energy camp installations requiring minimum AC power consumption. |
| Expanded Polystyrene (EPS) | 50mm / 75mm | Class B2 (Flame-retardant) | 12 – 16 kg/m³ | Budget-driven temporary construction worker barracks, seasonal agricultural worker housing. |
5. Step-by-Step On-Site Assembly Process & Tooling
Assembly is 100% mechanical bolt-together. A basic crew requires only electric impact wrenches, spirit levels, ladders, and standard hand tools (no cranes required for single-storey assembly):
- Step 1: Bottom Chassis Assembly (45 Mins): Bolt the 2 longitudinal beams and 2 transverse beams together using M12 structural bolts. Fasten the 9 transverse floor joists into pre-punched slots.
- Step 2: Subfloor Board Installation (30 Mins): Lay the 18mm MGO or fiber cement floor boards over the joists and secure with self-tapping countersunk screws.
- Step 3: Corner Column Erection (20 Mins): Bolt the four 160mm corner columns vertically to the bottom chassis corners.
- Step 4: Top Roof Frame Assembly (45 Mins): Bolt the 4 top perimeter roof beams to the top of the corner columns, install roof purlins, roof insulation quilt, and color-coated exterior roof sheets.
- Step 5: Wall Panel Slot-In (45 Mins): Insert the 14 tongue-and-groove sandwich wall panels into the bottom channel guides and secure with top angle flashings.
- Step 6: Windows, Door & Electrical Wiring (45 Mins): Fasten aluminum sliding windows, steel entrance door, internal PVC corner cappings, and plug-and-play surface-mounted electrical conduit kit.
Total Assembly Time: 4 general laborers assemble 1 complete detachable container house in 3.5 to 4.0 hours.
6. Detachable vs. Flat-Pack: Detailed Comparison for Buyers
| Decision Factor | Detachable Container House | Flat-Pack Container House |
|---|---|---|
| 40HQ Sea Freight Capacity | 12 – 15 Units (50% cheaper freight) | 6 – 8 Units |
| Factory Purchase Price | $1,350 – $1,650 / unit (Lowest cost) | $1,800 – $2,200 / unit |
| On-Site Labor Time | 4 workers / 3.5 – 4.0 hours | 4 workers / 2.0 – 2.5 hours |
| Crane Requirement | No crane needed (Manual assembly) | Crane or forklift needed to lift roof cassette |
| Stackable Height Limit | Up to 2 Storeys | Up to 3 Storeys |
| Best Use Case | High-volume worker camps, budget projects, remote sites | Commercial offices, high-end staff quarters, hospitals |
7. Primary B2B Applications
- Turnkey Worker Accommodation Barracks: 4-person and 6-person dormitory units equipped with double bunk beds, individual steel lockers, and LED lighting for EPC construction camps.
- Remote Mining & Oilfield Camps: Heavy-duty Rockwool insulated units resistant to extreme dust, sandstorms, and fluctuating temperatures in West Africa, Central Asia, and the Middle East.
- Temporary Sanitary & Ablution Blocks: Waterproofed units equipped with multiple partitioned toilet stalls, ceramic urinals, shower cubicles, exhaust fans, and PVC drainage manifolds.
- Disaster Relief & Post-Crisis Resettlement: Rapid emergency deployment where 150 families can be sheltered from just ten 40HQ container shipments.
8. Factory-Direct FOB Pricing & Order Tiers
| Order Volume Tier | 50mm EPS Spec (FOB Tianjin) | 50mm Rockwool Spec (FOB Tianjin) | 75mm Rockwool Class A1 (FOB) |
|---|---|---|---|
| 1 – 15 Units (1 Container Batch) | $1,550 / unit | $1,680 / unit | $1,850 / unit |
| 16 – 60 Units (Multi-Container Batch) | $1,420 / unit | $1,550 / unit | $1,720 / unit |
| 60+ Units (Camp Wholesale Tier) | $1,320 / unit | $1,450 / unit | $1,590 / unit |
9. Request Engineering Drawings & Factory Quotation
Sino East Steel Group manufactures over 1,500 detachable container units monthly for export to Africa, the Middle East, Southeast Asia, and Latin America. We provide custom CAD floorplans, loading diagrams, structural calculation sheets, and complete installation video guides.
Contact our modular building sales engineering team:
Or complete the quotation request form below:
10. Frequently Asked Questions (FAQ)
Why is a detachable container house cheaper to ship than a flat-pack container?
A: A flat-pack container ships with pre-assembled roof and floor frames, taking up 580mm vertical height per unit (6 to 8 units per 40HQ). A detachable container disassembles every beam, column, and joist into flat steel bundles, fitting 12 to 15 complete units into a 40HQ container and reducing ocean freight per unit by more than half.
Is a crane required to assemble detachable container houses on-site?
A: No. Unlike flat-pack units which require a crane or telehandler to hoist the heavy pre-welded roof cassette, all detachable frame members weigh less than 40 kg each and can be handled and bolted into place manually by 4 workers using scaffolding ladders.
Can detachable container houses be stacked 2 storeys high?
A: Yes. Detachable container units with 2.5mm – 3.0mm galvanized corner posts and high-tensile structural bolts are certified for 2-storey stacking. External galvanized steel staircases and walkway corridors bolt directly to the frame.
What type of steel corrosion protection is applied to the frame?
A: All main frame beams, columns, and purlins are fabricated from hot-dip galvanized steel strip (zinc coating Z180 – Z275 g/m²) followed by a high-adhesion electrostatic thermosetting powder coat finish to prevent corrosion in humid or coastal environments.
What flooring is supplied with detachable container houses?
A: The standard subfloor consists of 18mm fireproof, water-resistant Magnesium Oxide (MGO) board or fiber cement board, overlaid with 1.8mm – 2.0mm commercial-grade PVC vinyl flooring in patterned finishes.
How are doors and windows installed in detachable containers?
A: Doors and windows are pre-integrated into dedicated modular sandwich wall panels at the factory. They slide into perimeter frame channels just like standard wall panels, allowing flexible window and door positioning on any side of the container.
What electrical system is supplied?
A: Units include an electrical package consisting of a surface-mounted PVC conduit kit, distribution breaker box, LED ceiling batten lights, light switches, and international standard power sockets (British 13A, European Schuko, Australian, or US standard).
How does the roof shed rainwater without an internal column drainage system?
A: Detachable units feature a corrugated arched steel roof with a central crown slope, directing water to exterior perimeter roof gutters that discharge runoff beyond the building footprint via external downspouts.
What is the production lead time for a 50-unit order?
A: Sino East Steel Group manufactures standard 50-unit detachable container batches in 10 to 14 business days at our Tianjin facility, with direct container loading for export via Tianjin Port.
11. Mechanical Joint Fastener Schedules & Torque Engineering
Unlike standard site cabins that use simple sheet metal screws, Sino East Steel Group detachable container houses rely on calibrated structural fastener assemblies:
- Main Chassis & Column Bolts: Grade 8.8 hot-dip galvanized M12 × 35mm high-tensile structural bolts, torqued to a certified 110 N·m, ensuring dynamic load resistance during heavy interior forklift or pallet jack movement.
- Secondary Floor Joist Fasteners: Hex-head self-drilling structural fasteners (5.5mm × 38mm) with integrated EPDM bonded washers securing the 18mm MGO subflooring directly to cold-rolled channel joists.
- Roof Framing Tension Cleats: Laser-cut 6.0mm steel plate corner cleats with pre-punched multi-hole arrays allowing rapid alignment of top longitudinal and transverse beams even on slightly uneven jobsite ground.
12. 10-Year Total Cost of Ownership (TCO) vs. Traditional Site Cabins
When evaluated over a 10-year multi-project horizon, detachable container houses deliver substantial operational savings:
| Cost Component | Detachable Container House (15 Units/40HQ) | Conventional Welded Steel Cabin |
|---|---|---|
| Initial Ocean Freight (per unit) | $230 – $290 | $1,600 – $2,200 |
| Inland Transport per 100km | $40 / unit (15 units per flatbed truck) | $350 / unit (1-2 units per truck) |
| Storage Footprint (When idle) | 1.2 m² per unit (flat bundled) | 15.0 m² per unit (full 3D box) |
| Relocation Capability | 5 to 8 project cycles with zero frame warping | 2 to 3 moves before frame fatigue |
