When comparing modular rooms, the exterior image is only one part of the decision. The frame, wall panels, roof layers, floor system, openings, and connection details affect how the unit is transported, installed, insulated, maintained, and adapted to its intended use.
For PHINIDE projects, final specifications are confirmed for the selected model and site. This guide explains the material questions worth asking before a quote is finalized.
Galvanized steel frame
Most modular room systems begin with a steel frame that carries the roof, wall, floor, and transport loads. Galvanized steel components are commonly used because the protective zinc coating helps support corrosion resistance in normal service conditions.
A useful quote should identify the frame approach: top and bottom beams, corner posts or fittings, floor support members, and the connections between components. These details matter for transport planning, lifting points, repeated assembly, and the relationship between the room and its final foundation or support system.
Insulated wall and roof panels
Sandwich panels combine metal skins with an insulated core. The selected panel thickness, core material, joint treatment, and placement affect thermal comfort, sound control, fire-performance planning, and finished appearance. The right specification depends on climate, intended use, local rules, and whether the unit will be used as storage, office space, guest accommodation, or a bathroom-equipped room.
For example, PHINIDE standard-room planning can include 50 mm rock-wool wall panels. Expandable-house catalog configurations reference insulated sandwich panels, including 75 mm wall-panel configurations and 50 mm panel assemblies in other parts of the enclosure. Final panel build-up must be confirmed for the actual model and project.
Floor system
The floor system needs to support the intended load while coordinating with the base frame, insulation, interior finish, and utility routing. Cement-fiber panels are a common durable substrate in modular construction. For expandable-house catalog configurations, an 18 mm cement-fiber floor is referenced.
Buyers should also discuss moisture exposure, bathroom waterproofing, finish materials, furniture loads, and the condition of the supporting ground. A strong room shell cannot compensate for an unsuitable or unprepared placement area.
Doors, windows, and glass facades
Openings affect daylight, ventilation, security, privacy, and the way the room is used. A standard room can be planned with security doors and windows. A glass-front room introduces larger glazing areas, doors, and awning-window options for customer-facing, studio, or guest-space use. Expandable-house configurations can include aluminum double-glazed entrance doors and double-glazed sliding windows.
Before production, confirm opening locations, door swing or sliding direction, security requirements, ventilation, window treatment, electrical equipment positions, and any deck or step interface.
Factory production and on-site work
Factory-made components make the project more consistent, but they do not eliminate site planning. Delivery and installation still depend on access, placement, unloading equipment, weather, utilities, local approvals, and the final configuration.
A clear project process should separate what is included in the supplied module from what must be prepared on site. This can include foundations or leveling, utility connections, permit fees, local engineering, and final inspections.
Questions to include in your materials review
- Which frame and corrosion-protection approach applies to this model?
- What are the wall and roof panel thicknesses and insulation options?
- What floor substrate and finish are included?
- Which doors, windows, glazing, and hardware are included?
- How will the unit be packed, lifted, shipped, and placed?
- What must the customer prepare before installation?
Plan the right specification
PHINIDE can help match the structure, insulation, openings, layout, and delivery plan to the project. Start with the intended use and site location, then confirm the exact product specification before production.