How to Insulate Container Houses
Insulating container houses requires a comprehensive approach covering materials, structure, doors and windows, sealing, and temperature control equipment. Details are as follows:
Selecting insulation materials is crucial. High-density insulation materials are commonly used for exterior walls, such as expanded polystyrene (EPS) boards, rock wool boards, and polyurethane foam boards. These materials have low thermal conductivity and can effectively block heat transfer. For example, Zhongye Zhichuang uses high-density insulation materials to fill walls, roofs, and floors in northern projects, creating a continuous insulation layer. Some cases use sandwich panels with aluminum foil reflective layers to enhance thermal insulation efficiency by reflecting sunlight and blocking heat conduction. Interior wall insulation can adopt a closed design using materials like rock wool, expanded perlite boards, or fire-resistant gypsum boards, combined with moisture-proof membranes to control humidity and maintain stable temperatures.
Structural design needs to optimize thermal bridges. Thermal bridges (channels for heat loss) tend to form at the connection points, corners, and door/window installation areas of containers, requiring targeted insulation structure designs. For example, increasing the thickness of the insulation layer at connection points and filling gaps; using thermal-break aluminum alloy door and window frames to reduce metal heat conduction; and adding sealing strips around doors and windows to minimize air infiltration. The national Technical Standard for Steel Structure Integrated Houses requires that the heat transfer coefficient of walls in residential containers be ≤0.45W/(㎡·K), equivalent to 1.8 times the insulation efficiency of traditional brick-and-concrete walls, necessitating structural optimization to meet this standard.
Door and window systems need upgrading. Doors and windows are the main pathways for heat loss, requiring materials with low thermal conductivity. For example, using double- or triple-glazed windows, which have a thermal conductivity more than 60% lower than single-glazed windows; some projects use thermal-break insulated doors and windows, which block heat conduction through the metal frame with thermal insulation strips. Additionally, adjustable sunshade awnings and bottom ventilation slots can assist in controlling indoor temperatures by reducing direct sunlight or cold air intrusion.
Sealing treatment cannot be overlooked. The joints between container panels, around doors and windows, and other areas must be tightly sealed to prevent cold air infiltration. During construction, professional sealing materials (such as silicone sealant and expanding foam) should be used to fill gaps, ensuring a tight bond between the insulation layer and the container structure. For example, a café in Mogan Mountain achieved a temperature drop of only 1.3°C after 8 hours of closure in winter through sealing treatment, resulting in more stable perceived temperatures.
Supplementary temperature control equipment. In extreme climate regions, additional equipment such as air conditioners, graphene floor heating, and entrance air curtains can be installed to regulate temperatures. For example, in the Xinjiang Dashixia Dam project, container houses are equipped with electric heaters to meet winter heating demands. Meanwhile, details like laying carpets on the floor and installing insulation boards beside beds can further enhance local warmth.
