AIEHS Certified Mold Remediation CMRP Exam
**Question 1. Which of the following best describes the primary reproductive structure of most
indoor molds?**
A) Conidia
B) Basidiospores
C) Ascospores
D) Zoospores
Answer: A
Explanation: Most indoor molds reproduce asexually by producing conidia, which are dry,
airborne spores that facilitate rapid colonization.
**Question 2. Moisture content above what percentage of the material’s equilibrium relative
humidity (ERH) typically supports mold growth?**
A) 30%
B) 50%
C) 70%
D) 90%
Answer: C
Explanation: An ERH of ≥70% provides sufficient water activity for most mold species to
germinate and grow.
**Question 3. Which indoor mold genus is most commonly associated with “black mold” and
production of potent mycotoxins?**
A) Aspergillus
B) Penicillium
C) Stachybotrys
D) Cladosporium
Answer: C
, AIEHS Certified Mold Remediation CMRP Exam
Explanation: Stachybotrys chartarum, often called “black mold,” can produce trichothecene
mycotoxins that are hazardous to health.
**Question 4. A building occupant reports chronic sinus congestion, wheezing, and eye
irritation that improve when away from the home. Which exposure is most likely?**
A) Chemical irritants from cleaning agents
B) Allergic reaction to mold spores
C) Carbon monoxide poisoning
D) Radon exposure
Answer: B
Explanation: Symptoms that fluctuate with presence in a building and improve when absent are
classic for mold allergen exposure.
**Question 5. Which factor has the greatest impact on mold growth rate in indoor
environments?**
A) Ambient temperature
B) Relative humidity
C) Light exposure
D) Airflow velocity
Answer: B
Explanation: Relative humidity directly influences water activity; higher humidity accelerates
mold colonization more than temperature within typical indoor ranges.
**Question 6. In the context of building science, what is the dew point?**
A) The temperature at which air becomes saturated with water vapor
B) The temperature at which water freezes on surfaces
C) The temperature at which HVAC systems operate most efficiently
, AIEHS Certified Mold Remediation CMRP Exam
D) The temperature at which air pressure equals vapor pressure
Answer: A
Explanation: Dew point is the temperature at which air reaches 100% relative humidity and
condensation can occur on surfaces.
**Question 7. Which building component is most prone to capillary action that can transport
moisture into wall assemblies?**
A) Insulation batts
B) Gypsum board
C) Brick veneer
D) Metal studs
Answer: C
Explanation: Porous masonry, such as brick veneer, can draw water upward via capillary action,
delivering moisture to interior finishes.
**Question 8. A technician uses a calibrated moisture meter on a drywall surface and reads 12%
moisture content. What does this indicate?**
A) The drywall is dry and safe from mold
B) Moisture is within acceptable limits for most indoor environments
C) The drywall is saturated and requires immediate remediation
D) The reading is inconclusive without temperature data
Answer: B
Explanation: Moisture contents below ~15% are generally considered safe for drywall; values
above 15% raise mold risk.
**Question 9. Which instrument provides the most accurate detection of hidden moisture
behind walls?**
A) Handheld hygrometer
, AIEHS Certified Mold Remediation CMRP Exam
B) Infrared thermal imaging camera
C) Digital thermometer
D) Air velocity meter
Answer: B
Explanation: Infrared cameras detect temperature differentials caused by moisture, revealing
hidden wet spots not visible to the eye.
**Question 10. Thermal bridging most commonly occurs at which building detail?**
A) Interior plaster finishes
B) Exterior insulation finishing system (EIFS) joints
C) Window framing
D) Ceiling drywall seams
Answer: C
Explanation: Metal window frames conduct heat, creating cold spots where interior surfaces
can reach dew point, leading to condensation.
**Question 11. During a walk‑through inspection, the assessor notes a “musty” odor emanating
from a crawl space. Which next step is most appropriate?**
A) Immediately begin demolition of all insulation
B) Perform a moisture mapping of the crawl space floor
C) Apply a biocide to the odor source without testing
D) Close the crawl space and schedule a later visit
Answer: B
Explanation: Mapping moisture helps locate the source of the odor and guides targeted
remediation.
**Question 1. Which of the following best describes the primary reproductive structure of most
indoor molds?**
A) Conidia
B) Basidiospores
C) Ascospores
D) Zoospores
Answer: A
Explanation: Most indoor molds reproduce asexually by producing conidia, which are dry,
airborne spores that facilitate rapid colonization.
**Question 2. Moisture content above what percentage of the material’s equilibrium relative
humidity (ERH) typically supports mold growth?**
A) 30%
B) 50%
C) 70%
D) 90%
Answer: C
Explanation: An ERH of ≥70% provides sufficient water activity for most mold species to
germinate and grow.
**Question 3. Which indoor mold genus is most commonly associated with “black mold” and
production of potent mycotoxins?**
A) Aspergillus
B) Penicillium
C) Stachybotrys
D) Cladosporium
Answer: C
, AIEHS Certified Mold Remediation CMRP Exam
Explanation: Stachybotrys chartarum, often called “black mold,” can produce trichothecene
mycotoxins that are hazardous to health.
**Question 4. A building occupant reports chronic sinus congestion, wheezing, and eye
irritation that improve when away from the home. Which exposure is most likely?**
A) Chemical irritants from cleaning agents
B) Allergic reaction to mold spores
C) Carbon monoxide poisoning
D) Radon exposure
Answer: B
Explanation: Symptoms that fluctuate with presence in a building and improve when absent are
classic for mold allergen exposure.
**Question 5. Which factor has the greatest impact on mold growth rate in indoor
environments?**
A) Ambient temperature
B) Relative humidity
C) Light exposure
D) Airflow velocity
Answer: B
Explanation: Relative humidity directly influences water activity; higher humidity accelerates
mold colonization more than temperature within typical indoor ranges.
**Question 6. In the context of building science, what is the dew point?**
A) The temperature at which air becomes saturated with water vapor
B) The temperature at which water freezes on surfaces
C) The temperature at which HVAC systems operate most efficiently
, AIEHS Certified Mold Remediation CMRP Exam
D) The temperature at which air pressure equals vapor pressure
Answer: A
Explanation: Dew point is the temperature at which air reaches 100% relative humidity and
condensation can occur on surfaces.
**Question 7. Which building component is most prone to capillary action that can transport
moisture into wall assemblies?**
A) Insulation batts
B) Gypsum board
C) Brick veneer
D) Metal studs
Answer: C
Explanation: Porous masonry, such as brick veneer, can draw water upward via capillary action,
delivering moisture to interior finishes.
**Question 8. A technician uses a calibrated moisture meter on a drywall surface and reads 12%
moisture content. What does this indicate?**
A) The drywall is dry and safe from mold
B) Moisture is within acceptable limits for most indoor environments
C) The drywall is saturated and requires immediate remediation
D) The reading is inconclusive without temperature data
Answer: B
Explanation: Moisture contents below ~15% are generally considered safe for drywall; values
above 15% raise mold risk.
**Question 9. Which instrument provides the most accurate detection of hidden moisture
behind walls?**
A) Handheld hygrometer
, AIEHS Certified Mold Remediation CMRP Exam
B) Infrared thermal imaging camera
C) Digital thermometer
D) Air velocity meter
Answer: B
Explanation: Infrared cameras detect temperature differentials caused by moisture, revealing
hidden wet spots not visible to the eye.
**Question 10. Thermal bridging most commonly occurs at which building detail?**
A) Interior plaster finishes
B) Exterior insulation finishing system (EIFS) joints
C) Window framing
D) Ceiling drywall seams
Answer: C
Explanation: Metal window frames conduct heat, creating cold spots where interior surfaces
can reach dew point, leading to condensation.
**Question 11. During a walk‑through inspection, the assessor notes a “musty” odor emanating
from a crawl space. Which next step is most appropriate?**
A) Immediately begin demolition of all insulation
B) Perform a moisture mapping of the crawl space floor
C) Apply a biocide to the odor source without testing
D) Close the crawl space and schedule a later visit
Answer: B
Explanation: Mapping moisture helps locate the source of the odor and guides targeted
remediation.
