IICRC WRT Microbial Growth (Mold) Control in Water Losses

Question 1

Which of the following is NOT required for mold to grow on a wet building material?

Accepted Answer

Direct sunlight

Answer

Mold needs moisture, a food source, and a suitable temperature range. It does not need light, and many molds grow better in dark, enclosed spaces such as wall cavities.

Question 2

Mold growth on wet materials can commonly begin within about what period if drying is not started?

Accepted Answer

24 to 48 hours

Answer

Mold colonization can begin within roughly 24 to 48 hours on wet, porous materials. This is why prompt response and drying are central to water damage restoration.

Question 3

Sustained relative humidity above roughly what level in a structure promotes microbial growth?

Accepted Answer

60%

Answer

Relative humidity that stays above about 60% supports mold growth. Drying goals therefore aim to bring the structure back to normal levels for the area.

Question 4

During a water damage job a technician finds extensive visible mold growth. What is the appropriate first response?

Accepted Answer

Stop work in the affected area, notify the client, and follow mold remediation protocols (S520)

Answer

Extensive mold is outside normal water mitigation. Disturbing it can spread spores, so the technician should stop, inform the client, and follow mold remediation protocols or refer the work to a qualified mold remediator.

Question 5

Which equipment helps reduce airborne mold spores in a work area?

Accepted Answer

HEPA-filtered air scrubber

Answer

HEPA-filtered air scrubbers capture fine airborne particles, including spores. A box fan only circulates spores, and an ozone generator is not a safe or reliable way to capture them.

IICRC WRT - Institute of Inspection, Cleaning and Restoration Certification Water Damage Restoration Technician Practice Test

IICRC WRT - Institute of Inspection, Cleaning and Restoration Certification Water Damage Restoration Technician Practice Test

IICRC WRT Microbial Growth (Mold) Control in Water Losses