CBD CBD Accessibility & Universal Design 2 — Questions and Answers
Question 1: What is the recommended knee clearance height under a wall-hung vanity to allow forward wheelchair approach per ADA standards?
- 24 inches high, 17 inches deep
- 27 inches high, 19 inches deep (Correct answer)
- 30 inches high, 24 inches deep
- 36 inches high, 12 inches deep
Correct answer: 27 inches high, 19 inches deep
ADA requires a minimum knee clearance of 27 inches high and 19 inches deep under accessible lavatory counters for wheelchair users.
Question 2: For an aging-in-place bathroom, which shower seat type is most recommended for its flexibility and space efficiency when not in use?
- Permanently fixed bench seat
- Fold-down wall-mounted shower seat (Correct answer)
- Freestanding shower stool
- Corner teak shower bench
Correct answer: Fold-down wall-mounted shower seat
A fold-down wall-mounted seat provides a sturdy, ADA-compliant seating option that folds flat against the wall when not needed, preserving floor space.
Question 3: Which flooring characteristic is most critical when selecting bathroom tile for an accessible or aging-in-place design?
- Large-format tiles (24×24 inches or larger) for fewer grout lines
- A minimum COF (coefficient of friction) of 0.60 wet for slip resistance (Correct answer)
- Glossy polished surfaces for easy cleaning
- Dark grout to hide moisture stains
Correct answer: A minimum COF (coefficient of friction) of 0.60 wet for slip resistance
A wet COF of at least 0.60 is recommended by the Americans with Disabilities Act Accessibility Guidelines (ADAAG) to reduce slip-and-fall risk.
Question 4: In an accessible bathroom, what is the maximum height for a wall-hung lavatory basin (measured to the rim) per ADA standards?
- 30 inches
- 34 inches (Correct answer)
- 36 inches
- 40 inches
Correct answer: 34 inches
ADA requires the lavatory rim to be mounted no higher than 34 inches above the finished floor to be reachable from a seated position.
Question 5: What is the purpose of blocking (backing) installed in bathroom walls during construction or renovation?
- To add structural rigidity to the framing only
- To provide solid anchor points for future or current installation of grab bars and accessories (Correct answer)
- To improve the acoustic insulation of the bathroom
- To create a vapor barrier behind tile
Correct answer: To provide solid anchor points for future or current installation of grab bars and accessories
Wall blocking provides a solid wood or metal substrate behind the finish wall surface so grab bars can be securely fastened at any location.
Question 6: Which type of door is most recommended in a Universal Design bathroom to maximize clear opening width and ease of use?
- Standard swing-in hinged door
- Pocket door or barn door (sliding door) (Correct answer)
- French double doors
- Bifold door
Correct answer: Pocket door or barn door (sliding door)
Pocket and barn doors slide parallel to the wall, providing the full door-width as clear opening without requiring swing clearance, ideal for tight or accessible spaces.
CBD CBD Accessibility & Universal Design 2
What is the recommended knee clearance height under a wall-hung vanity to allow forward wheelchair approach per ADA standards?