| Length of Crack | Diameter | |||
| 1/2 - | inch . . . . . . . . . . . . | Up to 12" | ||
| 1 - | inch . . . . . . . . . . . . Over | 12" to 24" | ||
| 1-1/2 - | inch . . . . . . . . . . . . Over | 24" to 36" | ||
| 2 - | inch . . . . . . . . . . . . Over | 36" to 48" | ||
| 2-1/2 - | inch . . . . . . . . . . . . Over | 48" to 60" | ||
| 3 - | inch . . . . . . . . . . . . | Over 60" | ||