Dampproofing of Mobile House Containers

Dampproofing of mobile house containers requires a comprehensive approach involving materials, design, construction, and auxiliary measures:

I. Material Selection and Treatment

The base material of the container must possess high strength and corrosion resistance. The surface should undergo multiple processes such as rust removal, corrosion prevention, and waterproofing to reduce the risk of rust and moisture erosion from the source. For example, containers made of galvanized steel sheets or coated with dampproof coatings can effectively isolate water vapor penetration. The dampproof coating should have anti-mold, corrosion-resistant, and highly waterproof functions, and regular products should be selected to ensure long-term stability and prevent dampproofing failure due to coating peeling.

II. Structural Design and Construction Optimization

1. Enhanced Sealing: Waterproof glue or sealing strips should be used at the joints of containers, gaps around doors and windows, and other areas prone to water seepage. Coating the roof with waterproof glue can extend its service life and reduce rainwater penetration. For example, foldable packing containers improve overall sealing through optimized connection and fastening technologies, adapting to extreme environments such as high cold and high heat.
2. Ventilation System Design: Reasonably design ventilation openings or install exhaust fans to promote air circulation and reduce internal humidity, preventing water vapor condensation caused by temperature differences (i.e., the "container rain" phenomenon). For example, container hotels effectively reduce dampness and mold problems through ventilation system design combined with dampproof and thermal insulation materials.
3. Bottom Dampproof Structure: Lay a dampproof vapor barrier or elevate the foundation at the bottom of the container to block the impact of ground moisture on the interior. For example, a municipal project requires dampproof vapor barriers at the bottom of houses to cope with 15 cm of ground moisture in low-lying areas.

III. Auxiliary Dampproof Measures

1. Desiccants and Dehumidification Equipment: Place desiccants (such as calcium chloride desiccant packs) or use dehumidifiers inside the container to actively absorb moisture from the air, especially suitable for maritime transport or high-humidity environments. For example, pairing a ZD-558LB dehumidifier in maritime containers can quickly reduce internal humidity and prevent cargo from getting damp.
2. Dampproof and Thermal Insulation Materials: Attach dampproof and thermal insulation cotton to the inner walls of the container to buffer diurnal temperature differences and reduce sudden drops in roof temperature, thereby lowering the probability of water vapor condensation. For example, in one case, attaching dampproof cotton to the inner walls successfully avoided the risk of "container rain".