Modular houses offer three insulation material options, which can be selected according to needs: 1. Class A fireproof rock wool board (50mm, 75mm, 100mm): with excellent fire resistance and thermal conductivity of 0.035W/(m K), suitable for high safety requirements. 2. Polyurethane foam (PU) (50mm, 75mm, 100mm): with thermal conductivity of 0.022W/(m·K), it has excellent thermal insulation performance and is suitable for different climate conditions. 3. Polystyrene foam (EPS) (50mm, 75mm, 100mm): with thermal conductivity of 0.035W/(m·K), it is cost-effective and suitable for warm and regular climates.