How Do UHPC Exterior Walls Achieve Integrated Insulation? Technical Solutions and Practices for Integrated Insulation

To achieve integrated thermal insulation for UHPC exterior walls, the decorative surface layer and insulation function must be organically combined, balancing insulation performance, structural safety, and construction convenience, and achieving building energy-saving goals through scientific and technological solutions. Drawing on its project experience with integrated insulation, Qinglong analyzes the core implementation paths and key points.

1. Integrated Solution with Built-in Insulation Layer

The insulation layer is embedded during the factory prefabrication stage, enabling integrated production and installation. Core structure: from outside to inside, it consists of a UHPC decorative surface layer (15-25mm), an adhesive layer, an insulation layer (30-80mm), and a backing panel (3-5mm). The insulation layer can be extruded polystyrene board (XPS), expanded polystyrene board (EPS), or rock wool board; rock wool board reaches a Class A fire rating, meeting the high fire-protection requirements of public buildings. Production process: in the factory, the insulation layer is firmly bonded to the UHPC surface layer using specialized equipment, with a high-pressure lamination process ensuring interlayer bond strength ≥0.6MPa to prevent later detachment. Advantages: standardized factory production with controllable quality and high installation efficiency; the insulation layer is protected by the UHPC surface layer for strong durability. Qinglong adopted this solution in the Shenzhen Pingshan High-tech Zone project, meeting insulation and energy-saving standards.

2. Integrated Solution with Externally Mounted Composite Insulation Boards

Composite insulation boards are applied on site, suitable for existing building renovations or complex styling requirements. Construction process: first install the UHPC decorative panels, reserving space for insulation installation; then fill the gap between the UHPC panels and the base wall with insulation material; finally perform sealing. Insulation material selection: rigid polyurethane foam can be sprayed on site, or insulation wool used as fill; sprayed polyurethane offers excellent insulation performance (thermal conductivity ≤0.024W/(m·K)) and strong construction adaptability. Precautions: ensure the insulation material fills the cavity completely without voids; after installation, seal all joints to avoid the thermal bridge effect. Qinglong frequently uses this solution in old building renovation projects for flexible and convenient construction.

3. Integrated Solution with Insulation Coating

Insulation coating is applied to the UHPC surface, suitable for thin, lightweight exterior walls. Technical features: high-performance insulation coating is applied to the UHPC panel surface with a coating thickness of 10-20mm, providing both insulation and decorative functions; the coating's thermal conductivity is ≤0.035W/(m·K), achieving energy savings of over 50%. Applicable scenarios: suitable for projects with wall thickness restrictions, or used as an auxiliary insulation measure combined with a built-in insulation layer to enhance insulation performance. Construction control: the UHPC surface must be ground before coating to ensure firm adhesion; apply in multiple coats to avoid cracking. Qinglong adopted this solution in small commercial building projects, with lower cost and fast construction.

4. Solution Selection and Quality Control for Integrated Insulation

Select the solution appropriately to ensure insulation performance and structural safety. Solution selection principles: new buildings should prioritize the built-in insulation layer solution; existing building renovations can use the composite insulation board solution; thin, lightweight exterior walls can use the insulation coating solution. Quality control points: insulation materials must comply with energy-saving standards; interlayer bond strength must be sampled and tested; thermal performance testing must be conducted after installation to ensure the heat transfer coefficient meets requirements. Energy-saving optimization: add supplementary insulation layers at door and window openings, internal and external corners, and similar locations to reduce thermal bridging losses. Qinglong uses BIM to simulate thermal performance, optimizing insulation layer thickness and construction for precise energy savings.