In large roof sandwich panels, how to prevent wind uplift from causing facing-core delamination?

Wind uplift creates negative pressure at roof edges and corners, placing the facing in tension. The risk depends on: 1) Facing-core bond strength (must be ≥0.1 MPa); 2) Core tensile strength (PU about 0.2–0.4 MPa, XPS <0.15 MPa). Solutions: a) Increase bonding rib height or embossing; b) Use through-fastening screws (≥4 per m²); c) Increase core density by 30% in edge regions; d) Use interlocking joints with pre-formed connection grooves. According to GB 50009, in regions with 50-year basic wind pressure of 0.55 kN/m², the facing peel resistance safety factor must be ≥1.5. Wind tunnel tests show that proper “clamping” anti-wind design distributes peel stress across the entire panel width.

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In large roof sandwich panels, how to prevent wind uplift from causing facing-core delamination?

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