Tongshan Container House Thermal Insulation

Thermal insulation of container houses in Tongshan can be achieved efficiently by optimizing materials, structural design, and auxiliary measures.

1. Selection of Core Materials

1. Wall Sandwich Panels: Prioritize the use of polyurethane foam layers (thickness ≥ 50mm), which have a thermal conductivity as low as 0.024W/(m·K), blocking over 80% of heat conduction. For example, the national 'Technical Standard for Steel Structure Integrated Houses' requires a heat transfer coefficient of ≤ 0.45W/(㎡·K) for residential container walls. Polyurethane sandwich panels easily meet this standard, with measured results showing that the cabin warms up 22 minutes slower than the outdoors in summer and the indoor temperature drops by only 1.3℃ after 8 hours of closure in winter.
2. Auxiliary Thermal Insulation Layers: Add an aluminum foil reflective layer on the outer side of the polyurethane layer to reflect over 90% of solar radiation heat; use fire-resistant gypsum board + moisture-proof film on the inner side to control humidity and temperature while enhancing fire resistance. For example, a café in Moganshan uses sandwich panels with an aluminum foil reflective layer, combined with adjustable sunshades, resulting in significantly lower indoor temperatures in the afternoon compared to the outdoors.

2. Structural Optimization Design

1. Double-Layer Wall Structure: Block thermal bridges through an air layer. For example, light steel frame houses use cold-formed thin-walled light steel frames as the load-bearing structure, with rock wool or glass wool filled in the walls to form a 'outer steel plate + air layer + inner insulation board' sandwich structure, improving thermal insulation efficiency by over 30%.
2. Enhanced Sealing: Use double-glazed windows (gap ≥ 12mm) for doors and windows, and fill gaps with expanding foam or rubber sealing strips to reduce the infiltration of hot and cold air. For example, the container houses of Zhejiang Hangxing Green Building Materials Technology eliminate joint leakage through fully welded structures and, combined with double-glazed windows, maintain indoor temperature fluctuations of less than 3℃.

3. Auxiliary Thermal Insulation Measures

1. Sunshade and Ventilation: Install adjustable sunshades on the roof to reduce direct sunlight; set up ventilation slots at the bottom to utilize the thermal pressure principle for natural convection, lowering indoor temperatures. For example, the café in Moganshan maintains a cool indoor environment in the summer afternoon through bottom ventilation slot design.
2. Floor Thermal Insulation: Use cement fiber boards or steel-wood composite floors for the floor, with 50mm thick extruded polystyrene boards (XPS) laid underneath to block ground heat conduction.