Signs Of Failure

Fogging or Condensation: Moisture trapped between double or triple-pane glass indicates a failed perimeter seal, which destroys the window's insulating value.
Cracked or Degraded Caulking: Dried out, peeling, or missing sealant where the window frame meets the exterior building facade.
Damaged Weatherstripping: Worn down, brittle, or torn rubber/felt seals that allow drafts and moisture to bypass the window frame.
Stress Cracks in the Glass: Small fractures starting at the edges of the pane, often caused by thermal expansion, wind loads, or building settling.

Corrosion or Rust: For steel or aluminum frames, rust or oxidation that can pit the metal and weaken the structural hold.
Wood Rot or Warping: For older or historical commercial properties with wood frames, soft spots caused by chronic water exposure.
Gaps or Shifting: Visible gaps between the window frame and the surrounding masonry or siding, signaling structural movement or poor initial installation.
Weep Hole Blockages: Clogged drainage holes at the bottom of the exterior frame that are supposed to let water escape, but instead cause water to back up into the building.

Difficulty Opening or Closing: Sashes that stick, bind, or require excessive force, which could mean a warped frame or failing internal balances.
Broken Locks and Latches: Faulty locking mechanisms that compromise building security and prevent a tight, energy-efficient seal.
Worn Operators or Cranks: Stripped gears on awning or casement windows that prevent them from cranking tightly shut.
Damaged Balances or Springs: In double-hung windows, failing balances that cause the heavy window sash to slam down unexpectedly (a major liability).

Water Stains or Peeling Paint: Drywall discoloration or bubbling paint directly beneath or adjacent to the window frame.
Drafts and Air Leaks: Physical drafts felt near the window, or localized complaints from tenants about temperature fluctuations.
Visible Light: If you can see daylight through the frame corners or seams from the inside, the window is leaking air and water.

ADA Compliance: Ensuring that window hardware on operable windows can be easily reached and operated by tenants with disabilities (where required).
Glazing Safety Marks: Checking for proper tempered or laminated safety glass stamps in high-traffic areas, storefronts, or doors to meet local building codes.

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