How to Modify Container House Walls

The modification of container house walls can be systematically carried out from four aspects: thermal insulation, exterior decoration, structural optimization, and construction specifications, and should be designed in combination with material properties and building safety requirements.

1. Thermal Insulation Modification

Container metal walls have high thermal conductivity and require multi-layer construction to enhance thermal performance. Exterior wall insulation is recommended to use EPS boards, rock wool boards, or polyurethane boards, among which rock wool boards have both Class A fire resistance and efficient thermal insulation properties, suitable for cold regions; interior wall insulation can use closed-cell rock wool or expanded perlite boards to reduce thermal bridge effects. During construction, steel grilles should be added between insulation layers to form an air layer (e.g., 50mm thick polystyrene board + steel grilles), blocking heat conduction through air convection. Insulation material joints should be staggered, and corners should be wrapped with L-shaped insulation boards to avoid cold bridges. For example, the insulation layer around window frames should be extended to the structural wall to ensure tightness.

2. Exterior Decoration Modification

The exterior facade decoration should balance durability and aesthetics. Anti-corrosion wooden cladding is suitable for a rustic style and requires pre-treatment for insect resistance; metal carved panels can simulate stone textures and have strong corrosion resistance; cement fiber boards are suitable for a modern industrial style and require a waterproof coating. Surface treatment should start with thorough rust removal (sanding to St3 grade), followed by spraying epoxy zinc-rich primer (dry film thickness ≥ 80μm) to enhance corrosion resistance, and selecting fluorocarbon paint or acrylic polyurethane paint for the topcoat to improve weather resistance. Cultural stone粘贴 (adhesion) should use special adhesives to ensure firm bonding with the base layer.

3. Structural Modification

Hole cutting should strictly follow mechanical principles. Window and door openings require cutting the container body first, then welding C-shaped steel reinforcement frames (specification ≥ C100), with window openings at least 300mm from corners to avoid stress concentration. Large floor-to-ceiling windows installation requires cutting the entire steel plate of the side wall, reinforcing with H-shaped steel, and filling the gap between the window frame and the wall with expanding foam for sealing. Skylight installation requires cutting a rectangular opening on the roof, welding angle steel frames, covering with double-glazed units (6+12A+6), and treating the perimeter with silicone sealant. All cut surfaces should be painted with anti-rust paint to prevent corrosion.

4. Construction Precautions

Before thermal insulation construction, the surface should be cleaned of oil and rust, and an interface agent should be sprayed to enhance adhesion; insulation board cutting errors should be ≤ 2mm, and they should be fixed using a dot bonding method (5-8 bonding points per square meter). Window and door seals should use EPDM rubber strips, and rain louvers should be installed in ventilation windows. Steel plate joints should be sealed with aluminum foil tape to prevent condensation water infiltration. After modification, an air tightness test should be conducted (air leakage ≤ 1.5m³/(m²·h) under a pressure difference of 50Pa) to ensure compliance with energy-saving standards.