When a disaster, a site mobilisation or a sudden capacity shortfall creates a deadline, the choice of emergency housing system determines how quickly people can be safely accommodated. Procurement teams assessing rapid-deployment options generally compare three approaches: standard volumetric modules and flat-pack modules — both factory-prefabricated by Beijing Chengdong International Modular Housing Corporation (brand CDPH) on the same modular platform — and folding modules, a fast-assembly format offered across the wider market that CDPH does not manufacture. Each trades transport efficiency against on-site assembly time in a different way, and the folding option is included so buyers can judge that trade-off with the supplier distinction clear. This comparison sets out the engineering facts behind those trade-offs so that project buyers can specify the right system for the situation rather than defaulting to the most familiar one.
What "Rapid Deployment" Means in Practice
Deployment speed in emergency housing is not a single figure. It is the sum of several stages: manufacturing lead time at the factory, packing and loading, sea or road freight, site preparation, assembly and commissioning. Modular construction moves the largest share of work — frame fabrication, insulation, glazing, electrical circuits and drainage runs — into the factory, which is why a CDPH module arrives with services pre-fitted in the roof and water supply running along the walls. Site work centres on foundation work, lifting, bolting modules together and connecting utilities.
The three rapid-deployment variants differ mainly in how much of that final stage is done before dispatch:
- Standard modules leave the factory as complete volumetric units, fully finished internally. They require the least site work but the most transport volume per square metre.
- Flat-pack modules use the 6055 mm standard box packed flat for transport and assembled on site. Transport volume falls substantially; site assembly time rises accordingly.
- Folding modules (wider market — not a CDPH product) are fast-assembly units that unfold on site. They sit between the two, reducing transport volume while keeping site work to a sequence of controlled folding and fixing operations; buyers specifying them need a supplier who manufactures the format.
For emergency housing programmes where the constraint is ship capacity rather than crane availability, flat pack systems — and folding systems, where a supplier offers them — usually justify their extra site hours. Where the constraint is site labour or weather exposure, standard volumetric modules remain the more predictable choice.
Standard Modular Houses: The Reference Specification
The modular house range is the base system from which the other formats are derived. Modules are factory-prefabricated in galvanised cold-formed steel (t=3.0 mm, SGH340) and bolted together on site, which makes the completed building relocatable and reusable — a significant factor for emergency housing that may later be redeployed to a different site or converted to permanent use.
Two module footprints are produced: 6055 × 2990 × 2896 mm (internal 5845 × 2780 × 2500 mm) and 6055 × 2435 × 2896 mm (internal 5845 × 2225 × 2520 mm). Buildings can be configured as single, double, triple or higher storeys, in I, U, L or courtyard layouts, so a camp masterplan can be developed without changing the underlying module.
| Parameter | Value |
|---|---|
| Frame | Galvanised cold-formed steel, t=3.0 mm, SGH340, factory prefabricated |
| Roof live load | 1.0 / 0.5 kN/m² |
| Floor live load | 2.0 kN/m² |
| Wind load | 0.6 / 0.5 kN/m² |
| Roof and floor insulation | 100 mm glass wool |
| Walls | 75 mm colour-steel sandwich panels; seamless S-type rock wool composite panels |
| Flooring | 1.5 / 1.6 mm rubber-plastic flooring |
| Doors and windows | Steel doors; integrated PVC sliding windows with security bars and fly screens |
| Services | Electrical circuits pre-fitted in the roof; water supply along walls; wall-side drainage |
| Typical uses | Engineering camps, commercial buildings, emergency facilities, education facilities, military sites |
The security bars and fly screens are worth noting for emergency housing in hot climates: they are integrated at the factory rather than added later, which removes a procurement line and a site task from the critical path.
Flat-Pack Modules — and the Folding Alternative
The flat-pack format changes the logistics profile of the CDPH module system. A flat-packed 6055 mm standard box occupies far less ship or container volume than a finished volumetric unit, so a given freight budget moves more accommodation. The cost is paid on site, where walls, roof and fittings must be assembled and the pre-fitted services connected.
Folding container houses, offered by other manufacturers, take a different approach: the module is delivered in a folded state and opened on site as a fast-assembly operation. For emergency housing, buyers often treat this as the practical middle ground — more units per shipment than standard volumetric modules, and a shorter and simpler site sequence than full flat-pack assembly. CDPH does not manufacture folding units, so where a specification calls for them, that line sits outside the CDPH range; the format is kept in the comparison below for planning purposes.
Qualitative comparison for emergency response
| Consideration | Standard module | Flat pack | Folding module (wider market) |
|---|---|---|---|
| Factory completion at dispatch | Highest | Lowest | High |
| Transport volume per unit | Highest | Lowest | Low |
| Site assembly time | Shortest | Longest | Short |
| Site skill requirement | Low — lift, position, bolt, connect | Higher — panel and fit-out assembly | Moderate — controlled unfolding and fixing |
| Relocatable and reusable | Yes — bolted, demountable | Yes, with disassembly | Yes |
| Best suited to | Fast occupancy, labour-constrained sites | High-volume shipments, available assembly crews | Balanced freight and speed requirements |
The two CDPH formats share the bolted, demountable logic of the platform, so an emergency housing response can mix them: flat-pack units for the first wave where freight capacity is tight, standard modules for clinics, offices and other functions that need to be operational immediately.
Large-Span Prefab Houses for Support Functions
Emergency housing settlements need more than bedrooms. Dining halls, stores, clinics, briefing rooms and open-plan offices are typically better served by the prefab house ZA series, a highly prefabricated design with a hot-galvanised cold-formed steel structure and corrosion-resistant, well-insulated external wall panels. The system allows a span of up to 12 m and eaves heights of up to 3.5 m for accommodation and office types, or 4.5 m for storage types, both customisable, with column spacing at 3.45 m and a double-pitch roof at a 1:5 slope.
| Parameter | Value |
|---|---|
| Structure | Hot-galvanised cold-formed steel; columns T=2–3 mm |
| Wall panels | 75 mm colour-steel sandwich panels (white) |
| Roof | 75 mm corrugated colour-steel sandwich panels (blue) |
| Span | Up to 12 m |
| Eaves height | Up to 3.5 m (accommodation/office) or 4.5 m (storage), customisable |
| Column spacing | 3.45 m |
| Roof slope | 1:5, double pitch |
| Roof live load | 0.50 kN/m² |
| Wind load | 0.45 kN/m² |
| Working temperature | −25 °C to +50 °C |
| Doors and windows | Steel door 900 × 2100 mm, customisable; UPVC or aluminium alloy windows |
| Interior fit-out options | Bathrooms, kitchens, storage rooms, bedrooms, living rooms, open-plan offices |
| Erection rate | 4 workers erect about 40 m² of structure per day |
| Shipping density | About 200 m² of structure per 40 ft container |
The erection rate and shipping density figures give procurement teams a defensible basis for planning labour and freight, rather than relying on indicative claims. The working temperature range of −25 °C to +50 °C covers the majority of deployment environments; for more extreme conditions, CDPH has delivered a copper mine camp built for −55 °C conditions, and engineering review should be sought at enquiry stage.
Specifying, Certifying and Procuring Emergency Housing
Emergency housing procurement usually carries a compliance requirement alongside the speed requirement. CDPH holds CE marking for modular container houses, prefab houses and light steel villas, ISO 14001 and ISO 45001, product carbon footprint certification and National High-Tech Enterprise status. For specific markets, the company holds NATA materials certification for Australia, Intertek fire-resistance certification, CCS factory approval, and Intertek ICC-ES / WH building-material compliance for the US market; 14 key welders are qualified to AWS, CWB and CE standards. Certificates available upon request.
Fire performance is frequently the deciding factor for dense emergency housing layouts. A living camp supplied for a solar power station in Saudi Arabia had its fire performance verified by Intertek testing. Other reference deployments at region level include a port expansion camp in Cote d'Ivoire, a construction camp for a methanol plant, a camp for a cross-sea bridge project in Croatia, and a natural gas project camp in Nigeria.
On commercial terms, CDPH operates as a project-based manufacturer with no standard MOQ: every project is quoted individually after engineering review, and the engineering team replies within one business day with a concept proposal and a budget range. Buyers should build their programme around that review cycle rather than assuming catalogue lead times.
Procurement checklist for rapid-deployment emergency housing
- Define occupancy date and work back through freight, site assembly and commissioning.
- Confirm the transport constraint: container or ship volume available in the first wave.
- Select the format mix — flat pack for volume, standard modules for immediate-occupancy functions; if folding units are specified, confirm which supplier manufactures them.
- Confirm design loads against local wind and floor loading requirements.
- Set the fire performance requirement and request supporting certification early.
- Plan foundation and utility connection works in parallel with factory production.
- Agree the layout grid (I, U, L or courtyard) so future expansion uses the same module.
CDPH manufactures in China across three production bases in Hebei, Xinjiang and Sichuan, with the Hebei base 48 km from Tianjin Port. The company operates through 13 subsidiaries and offices with a team of 500+ people and 100+ engineers, and reports 5,000+ projects implemented in 100+ countries, with export markets including Eastern Europe, North America, Southeast Asia and Africa. Overseas projects run through CDPH (HAINAN) COMPANY LIMITED, the wholly-owned subsidiary of the Beijing corporation. To discuss a specific emergency housing requirement, contact the CDPH engineering team with the site location, required occupancy date and expected unit count; the team will respond within one business day with a concept proposal and budget range.