IICRC WRT Containment, Controlled Demolition and Material Removal 2 — Questions and Answers
Question 1: When performing a flood cut on water-damaged drywall, where is the cut typically made?
- Only at the baseboard height
- Exactly at the visible waterline
- At least 12 inches above the highest point of measured moisture wicking (Correct answer)
- At the midpoint of the wall regardless of moisture readings
Correct answer: At least 12 inches above the highest point of measured moisture wicking
Cutting above the highest measured wicking point ensures all wet and potentially contaminated material is removed.
Question 2: Before beginning controlled demolition in a home built before 1978, what must a technician consider first?
- The color of the existing paint
- Whether the drywall is 1/2 or 5/8 inch thick
- Whether the homeowner has flood insurance
- The possibility of lead-based paint requiring EPA RRP-compliant work practices (Correct answer)
Correct answer: The possibility of lead-based paint requiring EPA RRP-compliant work practices
The EPA Renovation, Repair and Painting Rule applies to disturbing painted surfaces in pre-1978 housing.
Question 3: Which material is most commonly recommended for constructing temporary containment barriers?
- Fire-retardant polyethylene sheeting, typically 6-mil (Correct answer)
- Canvas drop cloths
- Aluminum foil insulation
- Cardboard sheets taped together
Correct answer: Fire-retardant polyethylene sheeting, typically 6-mil
Polyethylene sheeting (often 6-mil, fire-retardant) is durable, impermeable and standard for containment.
Question 4: What is the main purpose of establishing negative air pressure inside a containment area?
- To lower the indoor temperature
- To keep contaminants from migrating into unaffected areas (Correct answer)
- To increase humidity for controlled drying
- To speed up evaporation from wet surfaces
Correct answer: To keep contaminants from migrating into unaffected areas
Negative pressure ensures air flows into, not out of, the containment, preventing contaminant spread.
Question 5: Wet carpet cushion (pad) affected by Category 3 water should generally be handled how?
- Cleaned with an antimicrobial and reinstalled
- Dried in place with air movers
- Removed and discarded (Correct answer)
- Lifted and floated for drying
Correct answer: Removed and discarded
Porous carpet cushion contaminated with Category 3 water cannot be adequately decontaminated and is removed.
Question 6: Which device is placed in a containment to filter airborne particulates and create negative pressure when ducted outside?
- Desiccant dehumidifier
- Axial air mover
- Injectidry wall system
- HEPA-filtered air filtration device (AFD) (Correct answer)
Correct answer: HEPA-filtered air filtration device (AFD)
A HEPA air filtration device exhausted outside the containment both cleans air and produces negative pressure.
Question 7: Before cutting into a wall during controlled demolition, which step reduces the risk of hitting hidden hazards?
- Checking for electrical wiring, plumbing and gas lines and de-energizing circuits as needed (Correct answer)
- Spraying the wall with water to reduce dust
- Removing all furniture from the house
- Turning up the HVAC fan
Correct answer: Checking for electrical wiring, plumbing and gas lines and de-energizing circuits as needed
Identifying utilities and shutting off power prevents shocks and damage to hidden services.
