CFI Quality Control & Maintenance Practices 4 — Questions and Answers
Question 1: A CFI inspector notes that a hardwood floor was installed with face-nailing near the walls. What is the primary reason this technique is used in those areas?
- Face-nailing provides a stronger hold than blind-nailing
- The flooring nailer cannot reach close enough to the wall (Correct answer)
- Face-nailing prevents squeaking near walls
- It is required by manufacturer guidelines in all areas
Correct answer: The flooring nailer cannot reach close enough to the wall
Blind-nailing equipment cannot operate close to walls, so face-nailing (which is then covered by base molding) is used in those tight areas.
Question 2: When evaluating carpet seam quality, what is the maximum allowable peak height per CRI installation guidelines?
- No visible peak is allowed (Correct answer)
- 1/16 inch
- 1/8 inch
- 1/4 inch
Correct answer: No visible peak is allowed
CRI guidelines state that properly made seams should lay flat with no discernible peak when viewed from a standing position under normal lighting.
Question 3: What type of floor finish requires the use of a floor buffer with a abrasive screen for recoating?
- Water-based polyurethane
- Oil-based polyurethane
- Wax finish (Correct answer)
- UV-cured finish
Correct answer: Wax finish
Wax-finished floors require screening or light abrasion to remove old wax buildup and provide mechanical adhesion before applying a new wax coat.
Question 4: A quality control check on LVT flooring reveals that tiles are not lying flat and some corners are lifting. What is the most probable cause?
- Tiles were installed in the wrong direction
- Insufficient trowel notch size causing inadequate adhesive coverage (Correct answer)
- Tiles were too cold during installation
- Grout was applied before adhesive cured
Correct answer: Insufficient trowel notch size causing inadequate adhesive coverage
Using the wrong trowel notch size results in insufficient adhesive transfer to the tile, leaving voids that allow corners to lift.
Question 5: Which environmental condition must be established and maintained before, during, and after hardwood flooring installation?
- Temperature between 50-95°F and humidity between 35-55%
- Temperature between 60-80°F and humidity between 30-50%
- Temperature between 65-75°F and humidity between 35-55% (Correct answer)
- Temperature above 60°F with no humidity restrictions
Correct answer: Temperature between 65-75°F and humidity between 35-55%
NWFA guidelines require the installation environment to be maintained at 65-75°F and 35-55% relative humidity to match in-service conditions.
Question 6: What is the primary quality concern with installing flooring over a particleboard subfloor in a bathroom?
- Particleboard is too smooth for adhesive bonding
- Particleboard swells and deteriorates rapidly when exposed to moisture (Correct answer)
- Particleboard is too heavy for bathroom floors
- Particleboard cannot be nailed through
Correct answer: Particleboard swells and deteriorates rapidly when exposed to moisture
Particleboard loses structural integrity when wet, swelling and crumbling, making it unsuitable as a subfloor in wet or high-humidity areas.
Question 7: When conducting a final walk-through quality inspection of a completed flooring installation, which area should be inspected under raking light?
- Only the center of the room
- Only transition areas and doorways
- The entire floor surface at a low angle (Correct answer)
- Only the areas near windows
Correct answer: The entire floor surface at a low angle
Raking light (low-angle side lighting) across the entire floor surface reveals surface defects, height variations, and installation irregularities that are invisible under overhead lighting.
CFI Quality Control & Maintenance Practices 4
A CFI inspector notes that a hardwood floor was installed with face-nailing near the walls.
What is the primary reason this technique is used in those areas?