IICRC MRS Exam Questions and Answers | Update
| 100% Correct Answers With Simplified Rationales
For Better Revision Graded A+ Pass
MOLD REMEDIATION – QUESTIONS, ANSWERS & CERTIFIED RATIONALES
1. What is the purpose of containment in mold remediation?
Answer: To prevent cross-contamination
Rationale: Containment prevents mold spores from spreading to unaffected areas during
remediation.
2. What pressure differential should be maintained during mold remediation?
Answer: Negative pressure of 0.05 inches of water column
Rationale: Negative pressure ensures air flows into the containment area rather than out,
keeping spores contained.
3. What material is recommended for containment barriers?
Answer: 6-mil polyethylene sheeting
Rationale: This material is durable, airtight, and effective at preventing spore migration.
4. What method is used to control airborne mold spores?
Answer: HEPA filtering
Rationale: HEPA filters capture 99.97% of airborne particles, including mold spores.
5. What is the best practice for removing contaminated materials?
Answer: Gently cutting and removing to minimize dust
Rationale: Minimizing dust reduces airborne spore release.
, 6. When should air monitoring be conducted during remediation?
Answer: Throughout the project
Rationale: Continuous monitoring ensures containment effectiveness and worker safety.
7. What respirator is recommended for mold removal?
Answer: P100 respirator
Rationale: P100 filters provide a high level of protection against airborne mold spores.
8. Which cleaning agents are effective against mold?
Answer: Household detergent, vinegar, and sodium hypochlorite (bleach)
Rationale: Detergents and vinegar reduce surface mold; bleach is effective but must be used
properly.
9. What is the most critical factor in preventing mold growth in water-damaged buildings?
Answer: Humidity control
Rationale: Mold requires moisture to grow; controlling humidity removes this requirement.
10. How should mold on porous materials be managed?
Answer: Removal and disposal
Rationale: Porous materials trap spores and cannot be reliably cleaned.
11. Why is negative air pressure important in containment?
Answer: To prevent external pollutants and mold spores from entering or escaping
Rationale: It protects both the remediation area and surrounding spaces.
12. Which of the following is NOT an indicator of mold infestation?
| 100% Correct Answers With Simplified Rationales
For Better Revision Graded A+ Pass
MOLD REMEDIATION – QUESTIONS, ANSWERS & CERTIFIED RATIONALES
1. What is the purpose of containment in mold remediation?
Answer: To prevent cross-contamination
Rationale: Containment prevents mold spores from spreading to unaffected areas during
remediation.
2. What pressure differential should be maintained during mold remediation?
Answer: Negative pressure of 0.05 inches of water column
Rationale: Negative pressure ensures air flows into the containment area rather than out,
keeping spores contained.
3. What material is recommended for containment barriers?
Answer: 6-mil polyethylene sheeting
Rationale: This material is durable, airtight, and effective at preventing spore migration.
4. What method is used to control airborne mold spores?
Answer: HEPA filtering
Rationale: HEPA filters capture 99.97% of airborne particles, including mold spores.
5. What is the best practice for removing contaminated materials?
Answer: Gently cutting and removing to minimize dust
Rationale: Minimizing dust reduces airborne spore release.
, 6. When should air monitoring be conducted during remediation?
Answer: Throughout the project
Rationale: Continuous monitoring ensures containment effectiveness and worker safety.
7. What respirator is recommended for mold removal?
Answer: P100 respirator
Rationale: P100 filters provide a high level of protection against airborne mold spores.
8. Which cleaning agents are effective against mold?
Answer: Household detergent, vinegar, and sodium hypochlorite (bleach)
Rationale: Detergents and vinegar reduce surface mold; bleach is effective but must be used
properly.
9. What is the most critical factor in preventing mold growth in water-damaged buildings?
Answer: Humidity control
Rationale: Mold requires moisture to grow; controlling humidity removes this requirement.
10. How should mold on porous materials be managed?
Answer: Removal and disposal
Rationale: Porous materials trap spores and cannot be reliably cleaned.
11. Why is negative air pressure important in containment?
Answer: To prevent external pollutants and mold spores from entering or escaping
Rationale: It protects both the remediation area and surrounding spaces.
12. Which of the following is NOT an indicator of mold infestation?
