What are the ADA requirements for tactile character height?
Quick Answer
ADA tactile characters must be 5/8 inch (16mm) minimum and 2 inches (51mm) maximum in height, with a stroke width to height ratio between 1:5 and 1:10, and raised at least 1/32 inch (0.8mm) from the sign surface.
Content Verification
Sources:
Code Reference
ADA 703.2
ADA 2010 Standards Section 703.2
Detailed Explanation
Tactile characters must meet specific dimensional requirements for readability by touch:
1. **Character Height**: 5/8" minimum to 2" maximum (uppercase letters).
2. **Stroke Width**: Width-to-height ratio between 1:5 and 1:10. For a 1" tall character, stroke width should be 1/10" to 1/5".
3. **Raised Height**: Characters must project at least 1/32" (0.8mm) from the background surface.
4. **Character Style**: Sans serif fonts only. No italics, oblique, decorative, or highly stylized characters.
5. **Uppercase Only**: All tactile characters must be uppercase letters.
6. **Contrast**: Characters must contrast with their background (70% minimum recommended).
Common Mistakes
- ×Using characters smaller than 5/8 inch
- ×Insufficient raised height (less than 1/32")
- ×Using serif or decorative fonts
- ×Using lowercase letters in tactile text
- ×Incorrect stroke width ratio
How to Verify Compliance
- ✓Measure character height with caliper or ruler
- ✓Use depth gauge to verify 1/32" minimum raised height
- ✓Confirm sans serif font style
- ✓Verify all uppercase letters
- ✓Check stroke width is proportional to height
Official Code Text
"Tactile characters shall be 5/8 inch (16 mm) minimum and 2 inches (51 mm) maximum based on the height of the uppercase letter I."
How to Cite This Page
When referencing this information:
SpecCodes.com "What are the ADA requirements for tactile character height?" - Verified 2026-01-30Compliant Products
To meet these requirements, compliant signage typically includes:
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Expert Verification
Compliance Information Verified
2026-01-30
CBC 2025 / ADA 2010
Effective January 1, 2026
California Building Standards Commission
Compliance Verification Notice
This information is provided for general reference purposes only. Local inspectors and authorities having jurisdiction (AHJ) have final authority over code interpretation and enforcement.
Before ordering signage, SpecCodes recommends:
- Contacting your local Building Department
- Reviewing current permit requirements for your project
- Confirming any local code amendments that may apply
Legal Notice: This content does not constitute legal advice. SpecCodes provides compliance information as a reference resource only. Users are responsible for verifying all requirements with their local jurisdiction before installation.