Rare and usually found in double-pane (insulated) glass, these often look like curved lines. They occur due to drastic changes in barometric pressure or if a window was manufactured at a significantly different altitude than where it was installed. When to Repair vs. Replace

Small chips or "oyster" cracks at the very edge of the pane, often hidden by the frame. 🛠️ Repair vs. Replace

These are the most obvious, featuring a central "starburst" pattern where an object struck the glass. Common culprits include birds, golf balls, or debris from a storm.

Where the rest of the window is clouded with the grime of years, the crack is pristine and sharp. The distortion caused by the break bends the light that passes through it, casting strange, fractured shadows on the floorboards inside. Whenever a draft finds its way through the rotting sash, the pane emits a low, shivering groan, and the loose shards chime against one another like nervous teeth.