Thermal Insulation of Prefabricated Concrete Houses

The thermal insulation performance of prefabricated concrete houses varies significantly depending on the structural type and material selection. Houses with sandwich insulation or lightweight concrete composite structures exhibit better thermal insulation, while ordinary concrete walls require optimized design to meet insulation requirements.

1. Prefabricated Concrete Sandwich Insulation Structure: Excellent and Stable Thermal Insulation Performance

This structure consists of two layers of concrete panels sandwiching insulation materials (such as polystyrene boards, rock wool, or polyurethane). It blocks heat conduction paths through a low-thermal-conductivity insulation layer. Its core advantages include:

• Stable Performance: Factory-standardized production ensures uniform distribution of the insulation layer, avoiding on-site construction errors and resulting in low degradation rates of thermal insulation performance over long-term use;
• Energy Efficiency: The insulation layer forms an integral part with the concrete panels, reducing thermal bridge effects and lowering building energy consumption by 20%-30%, meeting national and local energy efficiency standards;
• Wide Applicability: Suitable for severe cold, cold, and hot summer and cold winter regions, with particularly significant effects in areas with high winter heating demands.

2. Prefabricated Lightweight Concrete Insulated Exterior Wall Panels: Integrated Functionality and Thermal Insulation Performance

This structure comprises a 50mm-thick fine aggregate concrete surface layer, an insulation layer, and a 180mm-thick lightweight concrete layer made of expanded clay and polystyrene granules, connected by stainless steel components between the surface and lightweight concrete layers. Its characteristics include:

• Integrated Functionality: It simultaneously provides thermal insulation, decoration, and load-bearing functions, reducing construction procedures and material waste;
• Good Thermal Insulation Performance: The porous structure formed by expanded clay and polystyrene granules in the lightweight concrete layer reduces thermal conductivity, and when combined with the insulation layer, it meets the winter heating demands of residential buildings in northern regions;
• Lightweight and High Strength: The low density of the expanded clay and polystyrene granule lightweight concrete reduces wall self-weight and lowers structural loads.

3. Ordinary Prefabricated Concrete Walls: Require Optimized Design to Enhance Thermal Insulation

Ordinary concrete has a relatively high thermal conductivity (e.g., the thermal conductivity of ordinary concrete is 1.74 W/(m·K)), resulting in weaker thermal insulation performance compared to brick walls. Optimization can be achieved through the following methods:

• Adding Insulation Layers: Attach insulation materials such as polystyrene boards or rock wool boards to the exterior or interior sides of the wall to form a composite wall;
• Adopting Composite Structures: Combine materials such as lightweight concrete, air layers, or reflective films to reduce overall thermal conductivity;
• Optimizing Node Design: Reduce thermal bridge effects at door and window openings and wall junctions to enhance local thermal insulation performance.

Summary: The thermal insulation performance of prefabricated concrete houses should be comprehensively evaluated based on structural type and material selection. Sandwich insulation structures and lightweight concrete composite structures achieve efficient thermal insulation through material and structural optimization, while ordinary concrete walls require additional insulation layers or composite designs to meet energy efficiency requirements.