Roof Insulation for Container Mobile Houses

Roof insulation for container mobile houses typically employs a combination of sandwich panels and additional inner insulation layers, with the specific solution depending on the usage environment.

1. Selection of Roof Sandwich Panel Materials

The core material for roof insulation in container mobile houses is the sandwich panel, with common types including polyurethane sandwich panels and rock wool sandwich panels, which exhibit significant differences in performance:

1. Polyurethane Sandwich Panels: With a thermal conductivity of ≤0.024W/(m·K), they offer excellent insulation performance, effectively blocking heat transfer. They are suitable for cold regions in the north or scenarios requiring long-term heating in winter. Their closed-cell structure reduces air convection, further minimizing heat loss. However, attention must be paid to fire prevention, often necessitating the use of fire-resistant coatings or flame-retardant materials.
2. Rock Wool Sandwich Panels: With a thermal conductivity of ≤0.044W/(m·K), their insulation performance is slightly inferior to that of polyurethane, but they achieve a Class A (non-combustible) fire rating. They are suitable for high-temperature environments (such as long summers and high temperatures in the south) or flammable locations (such as chemical parks and warehouse perimeters). Rock wool fibers have a stable structure, are heat-resistant, and provide sound absorption and noise reduction. However, moisture-proof treatment is necessary to prevent an increase in thermal conductivity after water absorption.

2. Design of Additional Inner Insulation Layers

To further enhance insulation performance, additional insulation layers can be installed on the inner side of the container. Common materials and construction points are as follows:

1. Extruded Polystyrene (XPS) Boards: With a thermal conductivity of ≤0.030W/(m·K), they have a dense closed-cell structure and high compressive strength, making them suitable for laying on the ground or inner roof. A thickness of 5-10 cm is recommended; too thin a layer provides insufficient insulation, while too thick a layer may occupy indoor space. During construction, special adhesives must be used for fixation to avoid hollowing.
2. Phenolic Foam Boards: With a thermal conductivity of ≤0.022W/(m·K), their fire performance is superior to that of XPS (Class B1 difficult to burn), and they are heat-resistant and produce low smoke and toxicity, making them suitable for scenarios with strict fire prevention requirements. A thickness of 5-10 cm is also recommended, but they are more costly and require budget consideration.

3. Construction Precautions

1. Sealing Treatment: The joints of roof sandwich panels must be treated with waterproof glue or sealing strips to prevent cold bridge effects; the junctions between the inner insulation layer and the wall must be filled with expanding foam to reduce air leakage through gaps.
2. Ventilation Design: If rock wool sandwich panels are used, ventilation openings must be provided on the roof to prevent the accumulation of internal moisture, which can degrade insulation performance; for polyurethane sandwich panels, it is essential to ensure the integrity of the fire-resistant coating to prevent aging due to high-temperature exposure.
3. Environmental Adaptation: In cold regions in the north, polyurethane sandwich panels + XPS insulation layers are preferred; in hot or flammable environments in the south, rock wool sandwich panels + phenolic foam boards are selected to balance fire prevention and heat insulation requirements.