Where Braille is provided on projects regulated by the California Building Code, Chapter 11B, Braille shall be contracted (Grade 2) and comply with Sections 11B-703.3 and 11B-703.4. Braille dots are required to have a domed or rounded shape and comply with Table 11B-703.3.1.
||Minimum in Inches
Maximum in Inches
|Dot base diameter
||0.059 (1.5 mm) to 0.063 (1.6mm)
|Distance between two dots in the same cell
||0.100 (2.5 mm)
|Distance between corresponding dots in adjacent cells
||0.300 (7.6 mm)
||0.025 (0.6 mm) to 0.037 (0.9 mm)
|Distance between corresponding dots from one cell directly below
||0.395 (10 mm) to 0.400 (10.2 mm)
These requirements are compliant with the 2010 ADA Standards for Accessible Design (ADAS) but differ in some regards:
- ADAS allows the Distance between two dots in the same cell to be spaced 0.090 to 0.100 inches, but CBC Table 11B-703.3.1 requires spacing to be 0.100 inches.
- ADAS allows the Distance between corresponding dots in adjacent cells to be 0.241 to 0.300 inches, CBC Table 11B-703.3.1 requires spacing to be 0.300 inches.