Thermal Insulation Grade of Container Houses

The thermal insulation grade of container houses is mainly reflected by the heat transfer coefficient of the walls. The national 'Technical Standard for Steel Structure Integrated Houses' requires that the heat transfer coefficient of the walls of residential container houses be ≤0.45W/(㎡·K), which is 1.8 times the thermal insulation efficiency of traditional brick-and-concrete walls.

Core Structures and Materials for Thermal Insulation Performance

The thermal insulation performance of container houses relies on three key structural layers:

1. Outer Anti-corrosion Color-coated Steel Plate: It reduces heat absorption by reflecting sunlight and has anti-rust and corrosion-resistant properties, extending the service life of the house.
2. Intermediate Polyurethane Foam Layer: With a thickness of ≥50mm and a low thermal conductivity (usually ≤0.024W/(m·K)), it effectively blocks heat conduction and is the core layer for thermal insulation.
3. Inner Fire-resistant Gypsum Board + Moisture Barrier: The gypsum board, in combination with the moisture barrier, controls indoor humidity and temperature fluctuations, preventing a decline in thermal insulation performance due to humidity changes.

Actual Performance of Thermal Insulation Grades

According to actual measurement data, container houses that meet the standards experience a 22-minute slower temperature rise inside the cabin compared to the outdoors at noon in summer. In winter, when closed for 8 hours, the indoor temperature only drops by 1.3℃, resulting in a more stable perceived temperature without sudden cold or hot sensations. For example, a café in Moganshan uses sandwich panels with an aluminum foil reflective layer, along with adjustable sunshades and bottom ventilation slots. Even under direct afternoon sunlight, the interior remains comfortable without the need for air conditioning.

Differences in Thermal Insulation Performance and Selection Recommendations

1. Low Thermal Insulation Performance Products: Some simple container houses have a heat transfer coefficient of up to 3W/(㎡·K), far exceeding the national standard, and are only suitable for short-term, low-comfort scenarios (such as temporary office spaces on construction sites).
2. High Thermal Insulation Performance Products: Container houses that meet the national standard achieve efficient thermal insulation through multi-layer composite walls (such as rock wool sandwich panels and polyurethane sandwich panels), making them suitable for long-term residence, commercial operations, or cold/hot regions.
3. Enhanced Thermal Insulation Measures: Thermal insulation performance can be further improved by increasing the thickness of the sandwich panels, selecting materials with lower thermal conductivity (such as aerogel blankets), and optimizing the splicing process to reduce cold bridge effects.

Maintenance and Suitable Scenarios for Thermal Insulation Performance

The thermal insulation performance of container houses requires regular maintenance, such as checking for aging of the sealing strips and cracks in the walls. In cold regions, special attention should be paid to the fit between doors, windows, and frames. In humid regions, it is essential to ensure the integrity of the moisture barrier to prevent a decline in the performance of the thermal insulation materials due to moisture intrusion.