A distressed slab is recorded as one slab if it contains a single corner break, contains more than one break of a particular severity, or contains two or more breaks of different severities. For two or more breaks, the highest level of severity should be recorded. For example, a slab containing both light and medium-severity corner breaks should be counted as one slab with a medium corner break. Crack widths should be measured between vertical walls, not in spalled areas of the crack.
If the corner break is faulted 1/8 in. (3 mm) or more, increase severity to the next higher level. If the corner is faulted more than 1/2 in. (13 mm), rate the corner break at high severity. If faulting in corner is incidental to faulting in the slab, rate faulting separately.
The angle of crack into the slab is usually not evident at low severity. Unless the crack angle can be determined, to differentiate between the corner break and corner spall, use the following criteria. If the crack intersects both joints more than 2 ft. (600 mm) from the corner, it is a corner break. If it is less than 2 ft., unless you can verify the crack is vertical, call it a spall.