CO Mold Remediation Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary cause of mold growth in buildings?
A. Excess sunlight
B. High humidity and moisture
C. Poor insulation
D. Dust accumulation
B. High humidity and moisture
Rationale: Mold requires moisture to grow. Controlling humidity and
moisture is the most effective way to prevent mold.
2. Which personal protective equipment (PPE) is essential for mold
remediation?
A. Hard hat, gloves, and boots
B. N95 respirator, gloves, and protective clothing
C. Safety glasses only
D. Ear protection and gloves
B. N95 respirator, gloves, and protective clothing
Rationale: Mold spores can cause respiratory issues and skin
irritation; appropriate PPE prevents exposure.
3. What is the first step in a mold remediation project?
A. Remove all visible mold
B. Identify and fix moisture sources
C. Apply biocides immediately
D. Seal contaminated areas
B. Identify and fix moisture sources
, Rationale: Removing mold without addressing the source of moisture
will result in regrowth.
4. What is the most common mold species found in buildings?
A. Aspergillus
B. Penicillium
C. Stachybotrys
D. Cladosporium
D. Cladosporium
Rationale: Cladosporium is frequently found indoors on wood,
carpets, and insulation.
5. During mold remediation, why is containment important?
A. To increase airflow
B. To prevent mold spores from spreading
C. To allow workers to remove walls
D. To reduce noise levels
B. To prevent mold spores from spreading
Rationale: Containment minimizes cross-contamination to other
areas.
6. What is the recommended indoor relative humidity to prevent mold
growth?
A. 10–20%
B. 30–50%
C. 60–70%
D. 80–90%
B. 30–50%
Rationale: Keeping indoor humidity below 50% helps prevent mold
growth.
7. Which method is recommended for cleaning non-porous surfaces
contaminated with mold?
A. Vacuum only
B. Detergent and water, then disinfect
C. Sanding the surface
D. Covering with plastic
B. Detergent and water, then disinfect
Rationale: Cleaning with detergent removes mold, and disinfecting
kills remaining spores.
, 8. Porous materials heavily contaminated with mold should be:
A. Cleaned with bleach
B. Disposed of
C. Sealed with paint
D. Dried and left in place
B. Disposed of
Rationale: Porous materials like drywall and carpet often cannot be
fully cleaned and should be removed.
9. Which of the following is a common health effect of mold exposure?
A. High blood pressure
B. Respiratory irritation and allergies
C. Broken bones
D. Hearing loss
B. Respiratory irritation and allergies
Rationale: Mold spores can trigger asthma, allergies, and other
respiratory problems.
10. What type of respirator is generally recommended for mold
remediation?
A. Half-mask with HEPA filter
B. Surgical mask
C. Dust mask without filter
D. Full-face gas mask
A. Half-mask with HEPA filter
Rationale: HEPA filters effectively capture airborne mold spores
during remediation.
11. Mold growth on wood framing is typically caused by:
A. High temperature only
B. Moisture from leaks or condensation
C. Poor ventilation only
D. Dust accumulation
B. Moisture from leaks or condensation
Rationale: Wood retains moisture, creating an ideal environment for
mold.
12. Which factor does NOT significantly influence mold growth?
A. Temperature
B. Humidity
C. Moisture
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary cause of mold growth in buildings?
A. Excess sunlight
B. High humidity and moisture
C. Poor insulation
D. Dust accumulation
B. High humidity and moisture
Rationale: Mold requires moisture to grow. Controlling humidity and
moisture is the most effective way to prevent mold.
2. Which personal protective equipment (PPE) is essential for mold
remediation?
A. Hard hat, gloves, and boots
B. N95 respirator, gloves, and protective clothing
C. Safety glasses only
D. Ear protection and gloves
B. N95 respirator, gloves, and protective clothing
Rationale: Mold spores can cause respiratory issues and skin
irritation; appropriate PPE prevents exposure.
3. What is the first step in a mold remediation project?
A. Remove all visible mold
B. Identify and fix moisture sources
C. Apply biocides immediately
D. Seal contaminated areas
B. Identify and fix moisture sources
, Rationale: Removing mold without addressing the source of moisture
will result in regrowth.
4. What is the most common mold species found in buildings?
A. Aspergillus
B. Penicillium
C. Stachybotrys
D. Cladosporium
D. Cladosporium
Rationale: Cladosporium is frequently found indoors on wood,
carpets, and insulation.
5. During mold remediation, why is containment important?
A. To increase airflow
B. To prevent mold spores from spreading
C. To allow workers to remove walls
D. To reduce noise levels
B. To prevent mold spores from spreading
Rationale: Containment minimizes cross-contamination to other
areas.
6. What is the recommended indoor relative humidity to prevent mold
growth?
A. 10–20%
B. 30–50%
C. 60–70%
D. 80–90%
B. 30–50%
Rationale: Keeping indoor humidity below 50% helps prevent mold
growth.
7. Which method is recommended for cleaning non-porous surfaces
contaminated with mold?
A. Vacuum only
B. Detergent and water, then disinfect
C. Sanding the surface
D. Covering with plastic
B. Detergent and water, then disinfect
Rationale: Cleaning with detergent removes mold, and disinfecting
kills remaining spores.
, 8. Porous materials heavily contaminated with mold should be:
A. Cleaned with bleach
B. Disposed of
C. Sealed with paint
D. Dried and left in place
B. Disposed of
Rationale: Porous materials like drywall and carpet often cannot be
fully cleaned and should be removed.
9. Which of the following is a common health effect of mold exposure?
A. High blood pressure
B. Respiratory irritation and allergies
C. Broken bones
D. Hearing loss
B. Respiratory irritation and allergies
Rationale: Mold spores can trigger asthma, allergies, and other
respiratory problems.
10. What type of respirator is generally recommended for mold
remediation?
A. Half-mask with HEPA filter
B. Surgical mask
C. Dust mask without filter
D. Full-face gas mask
A. Half-mask with HEPA filter
Rationale: HEPA filters effectively capture airborne mold spores
during remediation.
11. Mold growth on wood framing is typically caused by:
A. High temperature only
B. Moisture from leaks or condensation
C. Poor ventilation only
D. Dust accumulation
B. Moisture from leaks or condensation
Rationale: Wood retains moisture, creating an ideal environment for
mold.
12. Which factor does NOT significantly influence mold growth?
A. Temperature
B. Humidity
C. Moisture
