InterNACHI / IAC2 Certified Mold Inspector

How does the IAC2 Mold Inspection Standards of Practice differ from the basic InterNACHI mold inspector SOP regarding outdoor air sampling?

• ABoth SOPs make outdoor sampling optional
• BThe IAC2 SOP and its Decision Chart specifically call for two outdoor comparison samples…
• COnly the basic InterNACHI SOP requires outdoor samples
• DBoth SOPs require four outdoor samples at the cardinal directions

Per the IAC2 SOP, what types of mold inspections are recognized?

• APre-listing and post-purchase only
• BComplete and limited
• CVisual and invasive
• DResidential and commercial

An inspector certified under the basic InterNACHI mold track is asked whether they may also perform the remediation work on the same property. Under the IAC2 SOP, what is the answer?

• AYes, as long as the customer signs a waiver
• BYes, IAC2 has no conflict-of-interest restriction
• CNo — IAC2 ethics prohibit the inspector from performing remediation on the same property…
• DOnly if the remediation is for less than $500

What scope of building does the IAC2 Mold Inspection SOP explicitly apply to?

• AAny structure with HVAC
• BResidential buildings with four or fewer dwelling units
• CCommercial high-rises over 50,000 sq ft
• DOnly single-family detached homes

Which of the following is NOT required of the inspector under the IAC2 SOP?

• AInspecting visible HVAC components
• BWalking on roofs that the inspector judges unsafe
• CMeasuring relative humidity in areas of concern
• DSampling the outdoor air for comparison

Per the IAC2 SOP, which condition does the inspector explicitly NOT have to identify?

• AVisible apparent mold in inspected areas
• BMoisture intrusion at exterior cladding
• CConcealed mold inside wall cavities without destructive testing
• DConducive conditions in the basement

Under the IAC2 SOP, what does the term 'apparent mold' mean?

• AMold confirmed by laboratory analysis
• BVisible growth with characteristics of mold which the inspector cannot confirm without sa…
• CMold reported by the homeowner but not visible
• DMold visible inside a wall cavity

Which statement BEST captures how the IAC2 SOP treats the predictive value of a mold inspection?

• AIt predicts mold growth for the next 12 months
• BIt is valid only for the date of inspection and cannot predict future growth
• CIt is valid for one year from issue
• DIt guarantees a mold-free environment

Compared to the basic InterNACHI mold inspector approach, IAC2 specifically requires laboratory analysis to be performed by:

• AAny third-party microscopy lab the inspector chooses
• BAn AIHA EMLAP-accredited laboratory (or equivalent recognized accreditation)
• CAn on-site portable microscope only
• DThe IAC2 head office laboratory

Under the IAC2 SOP, what is the minimum reporting content for a Limited mold inspection?

• ANothing — limited inspections are verbal only
• BA description of the specific room/area, conditions found there, and laboratory analysis…
• CA full whole-building assessment
• DOnly photographs of mold

Which item is required of a Complete IAC2 mold inspection that is NOT required of a Limited inspection?

• APhotographs
• BVisual examination of roof, exterior, basement/foundation, HVAC, plumbing, attic, and int…
• CA signed pre-inspection agreement
• DOutdoor comparison samples

The IAC2 SOP differs from the basic InterNACHI mold inspector SOP by treating moisture mapping as:

• AOptional and only on customer request
• BAn expected part of identifying conducive conditions in areas of concern
• CA separate scope outside any IAC2 inspection
• DA task reserved for remediation contractors

Under IAC2 ethics, an inspector who is the sole member of an LLC that also markets remediation must:

• ADisclose the relationship and decline the inspection or the remediation on the same prope…
• BCharge a higher fee to cover the conflict
• CHire a second inspector to co-sign the report
• DOperate freely — IAC2 has no separation requirement

Under the IAC2 SOP, what should an inspector do when an area is unsafe to enter?

• AEnter anyway with PPE
• BSkip it silently
• CDocument the limitation in the report and explain why the area was not inspected
• DHave the homeowner sign a release and proceed

What is the IAC2 SOP's position on testing showers and tubs for active leaks?

• AInspectors must run all showers for 10 minutes
• BInspectors are not required to operate showers or fill tubs to test for leaks
• CInspectors must dye-test all plumbing
• DInspectors must remove tub access panels

Which condition is treated MORE stringently in the IAC2 SOP than in the basic InterNACHI mold inspector SOP?

• AReporting cosmetic stains
• BThe required pairing of indoor air samples with windward/leeward outdoor comparison sampl…
• CPhotographing the front of the house
• DWearing PPE during the inspection

Which classification describes mold that produces mycotoxins potentially harmful to humans?

• AAllergenic
• BPathogenic
• CToxigenic
• DSaprophytic

Which of these mold genera is most commonly associated with chronic water damage in indoor environments and toxigenic concern?

• ACladosporium
• BAlternaria
• CStachybotrys chartarum
• DPenicillium chrysogenum

Which statement BEST distinguishes viable from non-viable mold sampling?

• AViable counts living spores via culture; non-viable counts total spores (live and dead) v…
• BViable counts dead spores; non-viable counts living spores
• CBoth methods only count living spores
• DNon-viable methods require AIHA accreditation but viable methods do not

What four conditions must be present for mold to grow indoors?

• ASunlight, oxygen, mold spores, and warmth
• BMold spores, organic food source, moisture, and a suitable temperature
• CCO2, oxygen, water, and dust
• DDrywall, attic insulation, oxygen, and humidity

Which mold genus is one of the most common OUTDOOR allergenic molds globally and is also frequently found indoors?

• ACladosporium
• BMemnoniella
• CTrichoderma
• DFusarium

Aspergillus and Penicillium are typically reported together on spore traps as 'Asp/Pen' because:

• AThey are the same genus
• BTheir spores are morphologically similar under direct microscopy and cannot be reliably d…
• CLabs save money by combining them
• DThey have identical health effects

Which is the most common mold-related health effect in immunocompetent occupants?

• AInvasive aspergillosis
• BAllergic rhinitis and asthma exacerbation
• CHepatic cancer from aflatoxin
• DCellulitis

What is mycotoxin?

• AA spore
• BA toxic secondary metabolite produced by certain molds
• CA living mold cell
• DA non-viable cell wall fragment

Hyphae and spores are best described as:

• ABoth reproductive units
• BHyphae are the vegetative filaments of mold; spores are the reproductive units released i…
• CBoth vegetative structures
• DCellular organelles inside a single spore

Why are Stachybotrys spores often UNDER-counted on routine indoor air samples?

• AThey are too small to see under a microscope
• BThey are slimy and stick to surfaces rather than becoming readily airborne, so air sampli…
• CThey are not produced indoors
• DThey are filtered out by HEPA filters before reaching the cassette

Which is generally NOT a recognized 'sentinel' species suggesting chronic water damage indoors?

• AStachybotrys chartarum
• BChaetomium globosum
• CCladosporium herbarum
• DTrichoderma viride

MVOCs (microbial volatile organic compounds) are produced by:

• AOnly dead mold cells
• BActively growing fungal colonies as metabolic byproducts and are the source of musty odor
• CCombustion appliances only
• DPlant respiration

What is the appropriate first step on arrival at an IAC2 mold inspection per the SOP?

• AOpen all windows to ventilate
• BEstablish closed-building conditions and conduct an interview with the client about compl…
• CTake air samples before any visual inspection
• DWet-test all bathrooms

How long should closed-building conditions typically be maintained before mold air sampling?

• ANot required
• BAt least 5 minutes
• CSeveral hours up to 24 hours, depending on conditions
• DExactly one week

An 'area of concern' under the IAC2 SOP includes all of the following EXCEPT:

• AVisible water staining
• BMusty odor
• CCosmetic paint chipping on an exterior wall
• DApparent mold growth

Which tool is MOST diagnostic for identifying hidden moisture behind a wall?

• AVisual inspection alone
• BA non-contact moisture meter or thermal imaging camera correlated with a pin-type moistur…
• CA flashlight
• DA hygrometer in the center of the room

When inspecting an attic for mold, which observation is the strongest indicator of inadequate ventilation as a contributing cause?

• ALoose insulation
• BBlack staining on the underside of roof sheathing concentrated near the ridge or on north…
• CA single rodent dropping
• DOlder roofing nails

Which inspection finding most likely indicates an HVAC-driven mold issue?

• ADust on a return grille
• BApparent mold on supply registers and on the interior surfaces of the supply plenum
• CA worn-out air filter
• DA loose duct strap

Which is the BEST first investigation step when an occupant reports musty odor but the inspector sees no visible mold?

• AImmediately recommend remediation
• BMap moisture and RH in the surrounding areas, then consider air sampling and cavity inspe…
• COpen windows for an hour and re-sniff
• DOrder an ERMI test only

Per the IAC2 SOP, the inspector is NOT required to:

• AReport visible signs of moisture intrusion
• BDismantle plumbing or appliances to look for concealed mold
• CIdentify conducive conditions in the basement
• DDocument inaccessible areas

An inspector finds a basement with carpet over slab, persistent musty odor, and 70% relative humidity. The MOST defensible next step is:

• ATell the homeowner to throw out the carpet
• BDocument conducive conditions, recommend dehumidification, and consider air and surface s…
• CReplace the HVAC filter and rescan
• DRecommend foundation replacement

Which item is required documentation for every chain-of-custody mold sample under the IAC2 SOP?

• AUnique sample ID, location, date, and time of collection
• BOnly the lab's logo
• CThe inspector's home address
• DA signed homeowner photo release

Per the IAC2 SOP, what is the inspector's role with respect to determining the CAUSE of moisture intrusion?

• AThe inspector must determine and certify the root cause
• BThe inspector reports observed conditions and conducive factors but is not required to de…
• CThe inspector must always blame the roof
• DThe inspector must hire an engineer

The inspector encounters live electrical hazards in a partially flooded basement. The correct response under the IAC2 SOP is to:

• AWade in to inspect with the homeowner's permission
• BStop, document the safety limitation, recommend professional electrical evaluation, and p…
• CInspect from the doorway and pretend it's complete
• DPump the water and continue

An inspector finds water staining on a ceiling under a bathroom but no active moisture meter reading. The SOP-compliant report should:

• AOmit the finding because the meter reading is dry
• BNote the historical staining, the absence of current elevated moisture, and recommend mon…
• CDeclare the area mold-free
• DRecommend immediate ceiling demolition

A common practical flow rate range for spore-trap air pumps used in IAC2-compliant mold inspections is:

• A0.5 to 1 L/min
• B5 to 15 L/min (typically 15 L/min, per the manufacturer's specification)
• C100 to 200 L/min
• D1,000 L/min

Per the IAC2 Mold Sampling Decision Chart, how many OUTDOOR air samples should be collected for a typical residential inspection where air sampling is performed?

• AZero
• BOne
• CTwo — one windward and one leeward
• DFour — one at each cardinal direction

When sampling an HVAC system per the IAC2 Decision Chart, where should the indoor air sample be taken?

• AAt the return grille touching the wall
• BAt a supply register, typically several feet away from the register so the airstream mixe…
• CInside the air handler cabinet
• DOutdoors at the condensing unit

Surface tape-lift samples are MOST appropriate for:

• AQuantifying spore concentration per cubic meter of air
• BConfirming whether a visible discoloration is or contains mold and identifying the genus…
• CMeasuring relative humidity
• DDetecting mycotoxin levels

Swab samples differ from tape lifts in that swabs:

• ACannot be cultured
• BCan be cultured for viable analysis as well as examined by direct microscopy
• CAre restricted to outdoor use
• DMeasure air concentration

Why is windward-vs-leeward placement of outdoor samples important?

• AIt tests the pump's calibration
• BWind direction influences which outdoor mold reservoirs are upstream of the building; two…
• CIt satisfies state law in every state
• DIt is purely a regulatory checkbox with no scientific basis