10/13/2026
Where did the “dollar bill rule” come from?
Not physics.
Early repair systems struggled with cracks over 6 inches. But “our tools can’t repair that” eventually became “that CAN’T be repaired.”
Then came the easy-to-remember “dollar bill rule,” repeated until it sounded like science.
But history tells a different story.
Mid-1990s: U.S. windshield repair guidelines already recognized cracks over 6 inches as "long cracks" and specifically avoided setting a maximum repair length.
1999: Australia/New Zealand established a 14-inch standard.
2007: A proposed 18-inch U.S. limit was reduced to 14 inches to compromise with insurers (ROLAGS).
Later: Safelite/Belron acknowledged 24-inch repairs as safe and viable.
These limits reflected chemistry, tools, insurance interests, and industry compromise, not some magical point where glass becomes unrepairable.
The real limit depends on science, materials, and testing.
“Too long for OUR SHOP to repair” and “too long to repair” are two very different things.
