100+ Free IAC2 Mold Inspector Practice Questions

No — they are separate credentials. The basic InterNACHI mold inspector designation is issued under InterNACHI's general mold inspection track, while the IAC2 Certified Mold Inspector is awarded by the International Association of Certified Indoor Air Consultants (iac2.org), a separate certifying body. The IAC2 SOP is more rigorous: it specifically requires windward/leeward outdoor comparison samples, AIHA EMLAP-accredited lab analysis, complete vs limited inspection scoping, and stricter conflict-of-interest separation from remediation work. InterNACHI members can earn the IAC2 credential by completing an IAC2-approved mold course and passing the 120-question online exam.

The IAC2 Certified Mold Inspector exam consists of 120 multiple-choice questions. It is self-paced and delivered online through the InterNACHI/IAC2 portal. The cut-off is weighted but typically lands near 80 percent. Our practice bank provides 100 exam-aligned questions weighted to mirror the IAC2 SOP, sampling, lab interpretation, IAQ, and reporting domains.

The exam covers: the IAC2 Mold Inspection Standards of Practice (especially differences from the basic InterNACHI mold SOP); mold biology (toxigenic vs allergenic vs pathogenic, viable vs non-viable spores); inspection methodology (complete vs limited, conducive conditions, HVAC); sampling (air pump flow rates, swab and tape lift, windward/leeward outdoor comparison samples); lab interpretation (AIHA EMLAP-accredited labs, spore trap microscopy, viable culture, ERMI DNA analysis); IAQ basics (CO2, RH, temperature, ASHRAE 62.2 ventilation); and reporting (IAC2 templates, customer education, conflict-of-interest).

The IAC2 Mold Sampling Decision Chart requires two outdoor air samples — one taken on the windward side of the building and one on the leeward side — to characterize the local ambient mold burden. Indoor mold concentrations are then compared to this outdoor baseline. As a rule, indoor mold should not exceed outdoor levels, and the indoor spore profile should not contain genera that are absent outdoors. Samples are taken at the manufacturer's recommended flow rate (commonly 15 L/min) for a duration that yields readable spore counts without overloading the cassette.

The IAC2 mold course and exam are free to active InterNACHI members. IAC2 itself charges a separate annual listing fee (commonly nominal — often $1/year for InterNACHI members) to maintain placement in the IAC2 Certified Consultants Directory at iac2.org. State mold assessor licensing — required in Florida, Texas, New York, and other jurisdictions — is an additional cost that varies by state.

Many states that license mold assessors accept the IAC2 Certified Mold Inspector designation as evidence of training, but each state's licensing board sets its own requirements — including jurisdiction-specific exams, experience-hour minimums, and continuing education. Always verify with your state regulatory board. The IAC2 SOP itself is widely cited by attorneys and insurers as a reasonable standard of care for residential mold inspections.