What Are the Requirements of the Base Wall for UHPC Exterior Wall Panel Installation? Substrate Treatment and Qinglong Group Technical Standards

The core requirements for installing UHPC exterior wall panels on the substrate wall center on four indicators: "flatness, strength, dryness, and verticality". The wall must meet flatness ≤4mm/2m, tensile strength ≥0.3MPa, moisture content ≤6%, and verticality ≤H/1000 and ≤20mm. In the 120,000-square-meter roofing project at the Hainan International Convention and Exhibition Center, Qinglong Group inspected the substrate using 3D laser scanning, leveled non-compliant areas with polymer mortar (thickness ≤30mm), and fixed the steel keels with post-installed undercut anchors (pull-out resistance ≥5kN) to ensure safe load-bearing of the UHPC panels. Scientific substrate treatment is the cornerstone of a curtain wall system's 50-year service life and must strictly follow specifications.

Flatness Is the Prerequisite for Installation Quality

An uneven substrate causes stress concentration in panels. Qinglong Group conducts 100% inspection with a 2-meter straightedge, mechanically grinding or leveling with mortar wherever tolerances are exceeded. In the curved substrate treatment for the Wuhan Hanxiu Theater, we controlled flatness within ±3mm using CNC plastering machines, laying a solid foundation for the installation of shaped panels.

Strength and Stability Are the Guarantee of Safety

The substrate must pass pull-out tests to verify its bonding strength. Lightweight block walls require the addition of concrete constructional columns. In renovation projects, Qinglong Group reinforced the substrate with carbon fiber sheets, raising tensile strength above 1.0MPa. Rigorous substrate assessment prevents later hidden risks.

Moisture and Fire Protection Are Hidden Requirements

In humid regions, the substrate needs a moisture barrier (such as SBS membranes), and the fire rating must match the curtain wall system. We issue a substrate treatment plan for every project to ensure everything is foolproof. A quality substrate is half of a quality curtain wall.