04/06/2026
Storefront Glazing Systems: Common Vulnerability Points During High Wind and Rain Events
Nothing hampers the revenue of an operating business more than water damage through an exterior glass storefront system during a high wind and rain event. The loss of inventory, revenue, and the time required to close the business and perform repairs can be a significant burden for many property and business owners. That often leads to the same question: where did the water come from, the glass, the frame, or the surrounding building construction?
From a forensic testing standpoint, water intrusion through a storefront glazing system during a high wind and rain event is rarely the result of glass failure alone. More commonly, leakage develops at the system’s interfaces, joints, drainage pathways, and transition conditions when subjected to storm-created wind, extensive rain, pressure differential, and structural movement.
The most vulnerable areas typically include:
• Perimeter sealant joints where the frame interfaces with adjacent construction
• Sill members and drainage paths, including weeps and water collection zones
• Corner joints, frame joinery, and mullion-to-transom intersections
• Glazing gaskets, wet seals, and glass-to-frame contact points
• Anchorage and frame attachment conditions that may permit movement under load
• Transitions between the storefront assembly and the surrounding wall system
Under storm conditions, even minor deficiencies in these locations can permit water migration into the assembly or adjacent interior finishes. In many cases, the issue is not visible during a routine visual review and only becomes apparent when the system is subjected to controlled forensic evaluation or field testing.
This is an important distinction: a storefront system may appear intact, yet still exhibit compromised resistance to water pe*******on due to sealant degradation, joint separation, drainage obstruction, installation deficiencies, age-related wear, or movement-related distress. For that reason, the performance of a storefront glazing system should be evaluated not only by appearance, but by how its critical components perform under simulated service conditions consistent with recognized field and forensic testing protocols.
When a storefront system allows water intrusion during a major wind and rain event, the true cost is often not limited to repair of the glazing system itself. The greater impact may be business interruption, loss of use, damaged interiors or inventory, and the financial burden of shutting down operations while repairs and restoration take place. Viewed in that light, periodic assessment, maintenance review, and quality assurance testing over the life of a storefront system are simply prudent building stewardship. They help identify small performance issues before those conditions grow into larger and more expensive disruptions.
At TSSA Storm Safe DAC Inc., our role is to help identify these performance-related vulnerabilities before they develop into larger building envelope failures during the next significant weather event. Decades of forensic testing and damage assessment have shown us that the most serious storefront leaks are often rooted in small, overlooked deficiencies that only reveal themselves when the system is placed under real wind and rain demand.
