CBD Materials & Techniques 3 — Questions and Answers
Question 1: Which porcelain tile finish provides the best slip resistance for a bathroom floor?
- Polished
- Glazed
- Textured matte (Correct answer)
- High-gloss
Correct answer: Textured matte
Textured matte finishes have higher COF (coefficient of friction) values, meeting ADA slip-resistance requirements for wet floors.
Question 2: What is the function of a membrane waterproofing system applied beneath tile in a shower?
- It bonds the tile to the substrate
- It prevents water from reaching structural components (Correct answer)
- It improves grout adhesion
- It reduces tile lippage
Correct answer: It prevents water from reaching structural components
Waterproofing membranes form a continuous barrier that keeps moisture from penetrating to wall framing and subfloor.
Question 3: Which material is commonly used for frameless glass shower enclosures due to its safety properties?
- Annealed glass
- Tempered glass (Correct answer)
- Laminated glass
- Wire glass
Correct answer: Tempered glass
Tempered glass is heat-treated to be four to five times stronger than annealed glass and breaks into small, less dangerous pieces.
Question 4: What minimum thickness of tempered glass is typically specified for a frameless shower door panel?
- 3/16 inch
- 1/4 inch
- 3/8 inch (Correct answer)
- 1/2 inch
Correct answer: 3/8 inch
Most frameless shower door specifications require a minimum 3/8-inch tempered glass for adequate rigidity and safety.
Question 5: A client wants a heated bathroom floor. Which flooring material conducts radiant heat most efficiently?
- Carpet
- Cork
- Ceramic or porcelain tile (Correct answer)
- Solid hardwood
Correct answer: Ceramic or porcelain tile
Ceramic and porcelain tile conduct heat efficiently and retain warmth, making them ideal for use with in-floor radiant heating systems.
Question 6: What is 'lippage' in the context of tile installation?
- The adhesive that squeezes up between tiles
- The vertical displacement between adjacent tile edges (Correct answer)
- The grout line width specification
- The tile's water absorption rate
Correct answer: The vertical displacement between adjacent tile edges
Lippage refers to the height difference at the edge between two adjacent tiles, which can be a tripping hazard and aesthetic defect.
Question 7: Which stone material is least suitable for bathroom countertops due to its reactivity with acidic cleaners?
- Granite
- Quartzite
- Marble (Correct answer)
- Soapstone
Correct answer: Marble
Marble is a calcium carbonate stone that etches easily when exposed to acidic substances like common cleaners, citrus, or toothpaste.
CBD Materials & Techniques 3
Which porcelain tile finish provides the best slip resistance for a bathroom floor?