Container House

Insulation for container prefab houses can be achieved in several ways. Specific measures include the following:

Choosing suitable thermal insulation materials is the foundation for better heat retention. Common options include polystyrene board, polyurethane foam board, and rock wool board. These materials have low thermal conductivity and effectively block heat transfer. For example, polystyrene board is relatively low-cost and easy to install; polyurethane foam board has a high closed-cell ratio and excellent insulation performance; rock wool board combines fire resistance with insulation and suits projects with higher safety requirements.

Adding insulation layers creates a continuous thermal barrier. Exterior walls can use externally mounted insulation (such as polystyrene board covered with aluminum foil) or interior insulation boards (such as extruded polystyrene) to reduce heat transfer. For instance, laying double-layer XPS boards throughout the interior can markedly improve insulation, especially in cold regions. During installation, ensure the insulation sits tightly against the wall structure to avoid thermal bridges.

Optimizing window and door design is critical for cutting heat loss. Double- or triple-pane insulated glass lowers thermal conductivity, and the inert gas layer inside further blocks heat transfer. Installing weatherstrips (rubber or silicone) at window frames and door gaps reduces heat leakage from air infiltration. In addition, thermal-break aluminum window frames interrupt conduction paths and improve overall insulation performance.

Attention to detailing prevents localized heat loss. Joints in insulation materials and connections (such as wall–roof junctions) should be sealed with sealant or specialty tape to stop warm air from escaping or cold air from entering. Where the insulation meets the container structure, use both mechanical fastening and adhesive bonding so the seal stays intact, the assembly stays stable, and vibration does not cause the insulation to detach.

Adding underfloor heating can strengthen winter comfort. Installing an underfloor system indoors (electric or hydronic), together with a floor insulation layer (such as XPS board), delivers even heat from the bottom up and reduces heat loss through the floor. For example, occupied container houses in Harbin that combine underfloor heating with insulation measures can cope effectively with extreme cold.

Embedding insulation in the walls is another efficient approach. Using double-layer gypsum board finishes with lightweight insulation such as glass wool or rock wool in between keeps walls relatively thin while improving thermal performance. This method suits projects that prioritize interior space and has a relatively short construction cycle.