How to Seal Container Houses

Sealing container houses requires a comprehensive approach covering structural assembly, application of sealing materials, detail handling, and testing and acceptance. The specific methods are as follows:

I. Structural Assembly and Sealing Techniques

1. Panel Assembly: Side wall panels and roof panels are fixed using specialized connectors (such as C-channels and I-beams). The joints are filled with expanding foam or rubber strips as a backing, and covered externally with weather-resistant sealant (such as silicone sealant). The sealant strip width should cover at least 2 cm on each side of the joint to form a continuous waterproof layer.
2. Roof Assembly: The roof panels are assembled using overlapping or interlocking techniques, combined with a waterproof underlayment to prevent rainwater infiltration. The roof should be designed with a drainage slope (recommended ≥ 2%) and equipped with drainage channels and guide plates to reduce the damage to the sealing layer caused by hydrostatic pressure.
3. Welding Techniques: The welding quality of the container frame directly affects the sealing performance. Ensure uniform welds without any missed welds. Fully welded structures offer better sealing performance compared to bolted connections, especially in high-humidity or strong-wind environments.

II. Application of Sealing Materials

1. Initial Sealing: High-quality sealant strips (such as EPDM or neoprene rubber) are inserted into the assembly joints to accommodate temperature changes and UV exposure, preventing cracking due to material aging.
2. Secondary Sealing: Apply silicone sealant (thickness 2-3 mm) or polyurethane sealant (suitable for high-humidity environments) to ensure continuity and fullness, avoiding air bubbles and gaps. Silicone sealant offers excellent weather resistance, while polyurethane sealant provides superior adhesion.
3. Metal Waterstops: For high-stress assembly joints (such as corners or load-bearing areas), install stainless steel or galvanized steel waterstops, fixed by welding or bolting to enhance waterproof performance and extend the sealing lifespan.

III. Detail Sealing Handling

1. Door and Window Openings: Pre-embed EPDM rubber sealant strips, and apply sealant fully around the frame exterior where it contacts the wall panels to form a double waterproof barrier, preventing rainwater from seeping through the gaps.
2. Wall Penetrations: Install waterproof gaskets around the bases of pipelines or ventilators and seal with sealant to prevent moisture from penetrating indoors through the holes, paying special attention to the protection of electrical wiring penetrations.
3. Regular Maintenance: Inspect the condition of sealant and waterstops every six months, and every quarter in extreme climate areas (such as rainy or high-UV regions). Replace aging or cracked components promptly.

IV. Testing and Acceptance

After completing the sealing treatment, conduct a water spray test: continuously spray water for 30 minutes, focusing on checking for leaks at assembly joints, door and window openings, and wall penetrations. If leaks are found, locate the problem and reseal to ensure the sealing performance meets long-term use requirements.

By implementing these comprehensive measures, container houses can significantly improve their sealing performance and adapt to long-term use under different climatic conditions.