How to Waterproof Container Houses

Waterproofing container houses requires a comprehensive approach covering material selection, construction techniques, and regular maintenance:

I. Material Selection and Coating Treatment

The main body of container houses is made of steel, so specialized anti-corrosion and waterproof materials such as water-based high-chlorinated coatings should be used. These coatings, with water-based high-chlorinated polyethylene resin as the main film-forming component, have a dense film that blocks water, are resistant to acids, alkalis, and salt spray, and can effectively resist rain erosion. Before application, the base surface should be thoroughly cleaned of rust and oil stains. The coating should be applied in layers using rolling, brushing, or spraying methods to ensure a complete and leak-free coating. For exposed parts like the roof, waterproof adhesive can be applied to extend the service life, and high-density thermal insulation rock wool can be used to fill the walls, enhancing both waterproofing and thermal insulation.

II. Construction Technique Optimization

1. Joint Sealing: Joints between container panels, window and door openings, and roof splices are high-risk areas for water leakage. The waterproof membrane + sealant full-sealing technique should be employed, with a reasonable drainage slope designed to ensure proper water runoff and seamless joint sealing. For example, the folded edges of the roof iron sheet should be sealed with structural adhesive, and the moisture-proof membrane should be tightly adhered without gaps.
2. Drainage System: The gutter should have a horizontal slope, and the outlet should be reasonably designed to prevent water backup. During construction, ensure that the gutter is adequately protected against corrosion to prevent rusting or blockage by debris.
3. Structural Reinforcement: Avoid walking on the roof or installing heavy equipment to prevent loosening of fasteners or aging of waterproof pads. If holes need to be made for installing fans, exhaust pipes, etc., secondary waterproofing treatment should be applied to the surrounding cracks.

III. Regular Maintenance and Inspection

1. Regular Sealant Replacement: The sealant around windows and doors, container body splices, and roof gutters should be replaced every 5-7 years to prevent aging and cracking.
2. Roof Debris Removal: Remove leaves, snow, and other debris from the roof annually. Standing water on the roof should be strictly prohibited to prevent steel plate corrosion.
3. Weld and Coating Inspection: Inspect welds, corners, bottoms, eaves, and other areas annually. Small rust spots should be immediately ground and repainted. In inland dry areas, heavy anti-corrosion and recoating should be done every 8-12 years, in southern humid areas every 7-10 years, and in coastal areas every 3-5 years.
4. Foundation Elevation: Container houses should not be installed directly on the ground but should be elevated using pile foundations to prevent moisture damage to the bottom.