Window assemblies fail at their edges first: perimeter sealant on the standard sealant curve, then flashing laps, then water behind the sill. In a high-rise, waiting turns a caulking job into concrete-and-metal work.
See it age: watch a window sill assembly fail from sealant to flashing to frame over 40 years. Open the interactive building and drag the 40-year slider.
Documented, photographed, and ready for your board or your engineer.
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