WLFI Tools, Equipment & Safety Standards 2 — Questions and Answers
Question 1: Which piece of equipment should an inspector use to document precise gap measurements between flooring planks?
- Carpenter's square
- Feeler gauge or taper gauge (Correct answer)
- Laser level
- Dial indicator
Correct answer: Feeler gauge or taper gauge
Feeler gauges and taper gauges allow precise measurement of gap widths between planks, providing objective data for inspection reports.
Question 2: What is the primary purpose of a thermo-hygrometer in a wood flooring inspection?
- Measure surface hardness of finish
- Record ambient temperature and relative humidity (Correct answer)
- Detect subfloor voids
- Test adhesive bond strength
Correct answer: Record ambient temperature and relative humidity
A thermo-hygrometer records ambient temperature and relative humidity, which are critical because wood flooring expands and contracts in response to these conditions.
Question 3: When inspecting a glue-down installation, which tool helps determine if the correct trowel notch size was used?
- Tape measure
- Notched trowel gauge or transfer tape test (Correct answer)
- Moisture meter
- Shore durometer
Correct answer: Notched trowel gauge or transfer tape test
A transfer tape test (pressing tape onto the adhesive ridges) or notch gauge reveals the bead size, confirming whether the specified trowel notch was used.
Question 4: An inspector documents OSHA regulations on a jobsite. Under OSHA, what is the permissible exposure limit (PEL) for wood dust over an 8-hour TWA?
- 1 mg/m³
- 5 mg/m³ (Correct answer)
- 15 mg/m³
- 25 mg/m³
Correct answer: 5 mg/m³
OSHA sets a PEL of 5 mg/m³ (as a total dust 8-hour TWA) for wood dust in general industry, though stricter limits apply for certain hardwoods.
Question 5: Which optical tool is commonly used by flooring inspectors to check for surface finish inconsistencies such as thin spots or missed areas?
- UV/black light lamp (Correct answer)
- Thermal camera
- Digital caliper
- Angle grinder
Correct answer: UV/black light lamp
A UV/black light lamp reveals thin or missing finish coats on wood floors by causing the finish to fluoresce, highlighting inconsistencies invisible under normal lighting.
Question 6: A flooring inspector brings a certified calibration block to the jobsite. What is this block used for?
- Simulating floor load testing
- Verifying moisture meter accuracy (Correct answer)
- Setting trowel notch depth
- Measuring board thickness
Correct answer: Verifying moisture meter accuracy
Calibration blocks of known moisture content are used to verify that a moisture meter is reading accurately before and during inspections.
Question 7: Safety Data Sheets (SDS) must be available on a flooring jobsite for which of the following materials?
- Only solvent-based adhesives
- All hazardous chemical products including adhesives, finishes, and cleaners (Correct answer)
- Wood flooring planks only
- Power tools and machinery
Correct answer: All hazardous chemical products including adhesives, finishes, and cleaners
OSHA's Hazard Communication Standard (HazCom) requires SDS for all hazardous chemical products used on the jobsite, including adhesives, finishes, and solvents.
WLFI Tools, Equipment & Safety Standards 2
Which piece of equipment should an inspector use to document precise gap measurements between flooring planks?