How to Install a 3 m × 3 m Detachable Container House?

A detachable container house is a modular building assembled from prefabricated components, including steel frames, floor panels, wall panels, roof structures, and interior finishing elements. Installing a 3 m × 3 m detachable container house involves assembling and aligning the steel frame, fitting the wall panels and flooring, installing the roof structure and insulation, and sealing the exterior roof.

For construction companies, project developers, distributors, and buyers planning a prefabricated building project, understanding the assembly process can improve site preparation, coordinate installation work, and reduce avoidable construction errors.

This guide explains the main installation stages of a 3 m × 3 m detachable container house, from frame calibration and floor installation to roof sealing and final inspection. Each step highlights the details installers should understand before beginning work.

What Does This Installation Guide Cover?

The assembly sequence covers the steel frame, wall panels, floor panels, roof support members, interior ceiling sheets, glass wool insulation, exterior roof sheets, and interior corner trim.

Based on the supplied 3 m × 3 m installation drawings, the main components and fasteners include:

Important: Confirm the complete fastener list, required tools, lifting requirements, and component specification instructions for your exact model before installation.

What Should You Confirm Before Installation?

Before beginning assembly, make sure your installation team has a complete, consistent set of project documents.

Use the following questions as a pre-installation checklist:

• Do the installation drawings match the delivered model and dimensions?
• Are all frame members, panels, roof components, trim pieces, and fasteners identified?
• Is the foundation and anchoring design approved for the project location?
• Are the door, window, and service openings clearly shown?
• Has the supplier confirmed any conflicting labels or unclear assembly details?
• Are tightening requirements, sealing materials, and inspection criteria available?

Step 1: Assemble and Align the Steel Frame

The steel frame forms the primary structural framework of the container house. Accurate assembly at this stage is essential because frame misalignment can affect wall panel installation, floor fit, and roof positioning.

The first stage is frame assembly and calibration. The drawings identify 80 × 80 mm square tubes and 40 × 80 mm rectangular tubes, with M10 × 100, M10 × 60, and M12 × 22 carriage fasteners shown at the indicated connections.

Follow the numbered assembly sequence, keeping the fasteners loose enough to allow the calibration shown in the drawings.

Check the specified calibration measurements; the frame drawing specifies:

• A1 = A2 = 4,104 mm ±5 mm.
• B1 = B2 = 4,104 mm ±5 mm.

Note: Measure at the locations identified in the drawing and complete the required alignment before final tightening. The instructions explicitly state not to tighten any screws before the calibration step and to tighten all screws after calibration.

Step 2: Prepare and Install the Wall Panels

The installation drawings show the wall panel layout for the front, back, left, and right sides, along with panel labels and cutting areas. It also identifies panel A1 for the front wall.

Before cutting or installing the panels:

• Match each panel label to its position in the drawing.
• Confirm the front-wall orientation.
• Review the marked cutting areas.
• Verify the approved door and window layout.
• Request clarification if any dimension or label is unclear.

Use the cutting details for your specific unit. Do not assume that panels with similar appearances are interchangeable or that the same cutting layout applies to a different model.

Step 3: Fix the Wall Panels and Install Pressing Plate Channels

Once the wall panels are in place, install the pressing plate channels shown in the wall-fixing details.

Use the M4.5 × 75 mm countersunk self-tapping screws and M5.5 × 25 mm hex-head self-tapping screws indicated for this stage. Confirm the supplied fastener schedule before installation.

At this stage, verify that:

• Each panel is in its assigned position.
• The clamping channels match the drawing.
• The correct fasteners are used at each connection.
• Required wall openings remain consistent with the approved layout.

The drawing identifies the fastener types. Follow the complete drawing and supplier instructions rather than applying an assumed screw spacing.

Step 4: Install the Wall Panels and Floor Panels in Sequence

Follow the installation sequence and leave the floor uninstalled, as shown in the drawings. Install the 3 m front wall first, then position and secure the remaining floor panel.

The sequence can be summarized as follows:

• Install the floor panels indicated in the initial stage.
• Leave the designated floor panel uninstalled temporarily.
• Install the 3 m front wall.
• Place the remaining floor panel.
• Secure the floor panel to the bottom-frame purlins with screws.

This is a model-specific sequence. Confirm it before applying the same process to another detachable container house.

Step 5: Secure the Floor Panels to the Bottom-Frame Purlins

The floor-fixing drawing shows M4.2 × 38 mm countersunk self-tapping screws at the indicated connections to the 80 × 80 mm and 40 × 80 mm bottom-frame purlins.

Use the fixing-position drawing to identify the supporting members beneath each connection. Before fastening, confirm that the panel layout matches the installation sequence and that the specified connection points are accessible.

Keep the floor-fixing drawing available during this stage. The panel layout and fastening locations should come from the approved documents, not visual estimates.

Step 6: Install and Secure the Top Purlins

The roof-frame detail identifies 40 × 60 mm, 40 × 80 mm, and 50 × 50 mm purlins. It also shows M4.2 × 16 mm or M5.5 × 25 mm self-tapping screws at the designated connections.

Position the roof members according to their labels and connection details. Where the drawing lists alternative fasteners, confirm which option applies to the supplied configuration.

Before installing the ceiling sheets, review the roof-member arrangement against the drawing and confirm that all required connections are complete.

Step 7: Install and Secure the Interior Ceiling Sheets

The supplied drawings specify Type 831 or Type 980 interior ceiling sheets, secured with M4.2 × 16 mm flat-head self-tapping screws.

Confirm which ceiling profile is included in your order and follow the corresponding layout. The profile names should not replace a check of the actual panel dimensions and fixing details.

Install the ceiling components in the sequence shown before proceeding with the roof insulation and exterior roof assembly.

Step 8: Install the Exterior Roof Insulation and Sealing Strips

The roof detail shows glass wool insulation and water-blocking sealing strips. These are separate components within the roof assembly.

Before installing the exterior roof sheets, confirm that:

• The insulation material matches the order specification.
• The insulation placement follows the roof drawing.
• The sealing strips are installed at the indicated locations.
• Any unclear junction or edge detail has been resolved.

Step 9: Install and Fix the Exterior Roof Sheets

The exterior roof of this 3 m × 3 m detachable container house uses Type 980 roof sheets secured with M5.5 × 25 mm hex-head self-tapping screws. After securing the sheets, apply structural sealant to seal and waterproof the specified areas.

Treat fastening and sealing as two separate tasks:

• Position the exterior roof sheets according to the drawing.
• Secure them at the specified fixing locations.
• Apply structural adhesive sealant at the indicated areas.

Step 10: Install and Fix the Interior Corner Trim

The final interior finishing detail shows 40 × 40 mm interior corner trim secured with M4.2 × 16 mm flat-head self-tapping screws.

Install the trim at the locations shown after the relevant wall, floor, and ceiling connections are complete.

Finishing work should not replace a review of the underlying connections. Resolve any incomplete fastening or unclear assembly detail before closing out the installation.

What Should You Check Before Handover?

Before the installation is considered complete, review any outstanding questions. Keep a record of confirmed answers and any required follow-up work.

Planning a Detachable Container House Project?

DXH Container has manufactured prefab and modular container buildings since 2008 and supplies detachable container houses for site offices, worker accommodation, modular schools, labor camps, and other modular building projects.

We can support buyers with product selection, custom layouts, CAD drawings, 3D renderings, installation guidance, and technical clarification during assembly. The team can also discuss transport, site access, foundation, and installation responsibilities before delivery.

Explore DXH Container's modular building solutions and contact our team for product specifications, customization options, and a project-specific quotation. If you have purchased a DXH Container detachable container house, request the model-specific installation guide.