2022 California Standards for Accessible Design Guide (effective January 1, 2023)
11B-703.3.1 Dimensions and capitalization.
Braille dots shall have a domed or rounded shape and shall comply with Table 11B-703.3.1. The indication of an uppercase letter or letters shall only be used before the first word of sentences, proper nouns and names, individual letters of the alphabet, initials, and acronyms.
TABLE 11B-703.3.1 BRAILLE DIMENSIONS
|
MEASUREMENT RANGE |
MINIMUM IN INCHES |
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Dot base diameter |
0.059 (1.5 mm) to 0.063 (1.6 mm) |
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Distance between two dots in the same cell1 |
0.100 (2.5 mm) |
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Distance between corresponding dots in adjacent cells1 |
0.300 (7.6 mm) |
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Dot height |
0.025 (0.6 mm) to 0.037 (0.9 mm) |
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Distance between corresponding dots from one cell directly below1 |
0.395 (10 mm) to 0.400 (10.2 mm) |
1. Measured center to center.
ETA Editor's Note
Table 11B-703.3.1 in CBC is the same as Table 703.3.1 in 2010 ADA Standards, except for distance between dots in the same cell or adjacent cells. 2010 ADA Standards allows a range, while CBC prescribes the maximum spacing allowed by 2010 ADA Standards, with no deviation allowed. When dealing with sign manufacturers or elevator companies whose scope of operations extends outside California, extra diligence is necessary to ensure that CBC braille specifications are followed.
FIGURE 11B-703.3.1 BRAILLE MEASUREMENT ‡‡
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