CBD Safety & Building Code Compliance 3 — Questions and Answers
Question 1: In a bathroom shower enclosure, tempered or safety glazing is required for glass panels that are within how many inches of the floor?
- 18 inches
- 24 inches
- 36 inches
- 60 inches (Correct answer)
Correct answer: 60 inches
Safety glazing is required for glass within 60 inches of the standing surface in shower and bathtub enclosures per building codes.
Question 2: What is the minimum required R-value for insulation in exterior bathroom walls in Climate Zone 5 per IECC?
- R-13
- R-15
- R-20
- R-21 (Correct answer)
Correct answer: R-21
Climate Zone 5 requires a minimum of R-21 insulation in wood-frame exterior walls per the IECC energy code.
Question 3: Per ADA standards, what is the required mounting height range for bathroom accessories like soap dispensers and towel bars?
- 18 to 36 inches AFF
- 15 to 48 inches AFF (Correct answer)
- 24 to 54 inches AFF
- 15 to 60 inches AFF
Correct answer: 15 to 48 inches AFF
ADA requires operable parts and accessories to be mounted between 15 and 48 inches above finished floor (AFF) for reach compliance.
Question 4: Which ASTM standard governs slip resistance testing for bathroom floor tiles?
- ASTM C1028
- ASTM F1679
- ASTM C627
- ASTM F2508 (Correct answer)
Correct answer: ASTM F2508
ASTM F2508 is the current standard for measuring slip resistance using the Variable Angle Tribometer (VAT) method for flooring.
Question 5: What is the minimum number of electrical circuits required to serve a bathroom per the NEC?
- One 15-amp circuit
- One dedicated 20-amp circuit (Correct answer)
- Two 20-amp circuits
- One 15-amp and one 20-amp circuit
Correct answer: One dedicated 20-amp circuit
The NEC requires at least one 20-amp circuit dedicated to bathroom receptacle outlets, though lighting may be on a separate circuit.
Question 6: What type of pipe material is NOT permitted for water supply lines inside bathroom walls under most modern plumbing codes?
- PEX tubing
- CPVC pipe
- Lead pipe (Correct answer)
- Copper tubing
Correct answer: Lead pipe
Lead pipe has been banned from new construction and renovation water supply lines due to health hazards under the Safe Drinking Water Act.
Question 7: Per IPC/UPC codes, a toilet's drain rough-in must be a minimum of how many inches from the finished wall?
- 10 inches
- 12 inches (Correct answer)
- 15 inches
- 18 inches
Correct answer: 12 inches
The standard toilet rough-in dimension is 12 inches from the finished wall to the center of the drain, though 10-inch and 14-inch models exist.
CBD Safety & Building Code Compliance 3
In a bathroom shower enclosure, tempered or safety glazing is required for glass panels that are within how many inches of the floor?