Free CRMR Practice Questions

Question 1

After a plumbing leak is repaired, superficial mold growth is found on exposed wood studs. The wood is structurally sound, and all affected surfaces are accessible. The homeowner asks whether every discolored stud must be replaced. Which remediation scope is most appropriate?

Accepted Answer

Physically remove the growth, clean and dry the sound wood, and evaluate the cleaned surfaces.

Answer

Replace all discolored studs because staining indicates mold has penetrated the full thickness of the wood.

Answer

Apply a fungicide, then enclose the studs after completing its labeled contact time.

Answer

Run HEPA filtration until room air results are acceptable, then seal the stained studs without further surface cleaning.

Question 2

While mapping moisture in a bedroom, a technician obtains high pinless-meter readings along a narrow vertical strip at an outside drywall corner. Readings fall sharply a few inches to either side. What check would best distinguish wet material from instrument interference?

Accepted Answer

Check for metal corner bead and verify the material's moisture condition independently.

Answer

Repeat the readings on the strip; consistent results confirm that water is present.

Answer

Use a uniform thermal image to conclude that the strip is dry.

Answer

Open the full height of the corner, using the highest pinless readings to define the removal boundary.

Question 3

Two workers develop headache and dizziness while extracting water from a basement. A gasoline-powered generator is running in the attached garage with the garage door open. Both workers are wearing particulate respirators. What takes priority?

Accepted Answer

Move everyone to fresh air and call emergency services for suspected carbon monoxide exposure.

Answer

Have the workers rest in the basement while another worker moves the generator farther from the doorway.

Answer

Replace their particulate filters with organic-vapor cartridges before continuing the extraction work.

Answer

Increase HEPA air filtration and check for airborne mold before deciding whether evacuation is necessary.

Question 4

A plumber confirms that clear-looking water on a bathroom floor backed up from a waste line beyond the fixture trap. It affected only a small area and has no visible solids. How should the remediator classify and approach this loss?

Accepted Answer

Category 3; control exposure and remediate contamination before restorative drying.

Answer

Category 1; begin clean-water extraction and drying because the water has no visible contamination.

Answer

Category 2; use the absence of solids to distinguish this loss from gross sewage contamination.

Answer

Defer classification; obtain a bacterial culture before selecting contamination controls for the work.

Question 5

A site-specific plan requires at least 6 air changes per hour of HEPA-filtered air exhausted outdoors from a 3,600-ft³ enclosure. The exhaust unit is rated at 450 CFM but delivers 270 CFM with its installed filters and duct. A separate unit recirculates 180 CFM inside the enclosure. Which assessment correctly addresses the exhaust requirement?

Accepted Answer

The enclosure receives 4.5 exhaust ACH; measured outdoor exhaust must increase by at least 90 CFM.

Answer

The enclosure receives 7.5 exhaust ACH; the exhaust unit's 450-CFM rating establishes that the requirement is met.

Answer

The enclosure receives 7.5 exhaust ACH; adding measured exhaust and recirculated airflow establishes compliance.

Answer

The enclosure receives 4.5 exhaust ACH; adding a 90-CFM recirculating HEPA unit will satisfy the exhaust requirement.

Question 6

A paid mold-remediation job in an occupied 1965 single-family home includes demolishing 4 square feet of painted drywall. The paint has not been determined to be lead-free, and the work is not an emergency renovation. A crew member claims the federal RRP minor-repair exclusion applies because the area is below 6 square feet. What defeats that claim?

Accepted Answer

Demolition of painted surfaces falls outside the minor-repair exception, even when the affected area is small.

Answer

Every paid repair in pre-1978 housing is covered, including work that does not disturb painted surfaces.

Answer

The 6-square-foot allowance applies to the entire house rather than to each individual interior room.

Answer

The contractor must use the 20-square-foot exterior allowance for demolition performed inside a residence.

Question 7

An electric heater raises room air from 68 °F to 86 °F. Relative humidity falls from 60% to 33%, but the humidity ratio remains about 61 grains of water per pound of dry air, and wall moisture readings are unchanged. Which interpretation belongs in the drying log?

Accepted Answer

The air warmed without a measured decrease in vapor content; material drying has not yet been demonstrated.

Answer

The fall in relative humidity confirms vapor removal; unchanged wall readings reflect delayed instrument response.

Answer

Warmer air contains less water per pound of dry air; additional dehumidification is unnecessary.

Answer

The lower relative humidity establishes that the wall cavity has reached equilibrium with the room and is ready to close.

Question 8

Inspection confirms visible mold on the back of leak-damaged gypsum board. The moisture source and affected area are known, and controlled removal is planned. The homeowner wants species identification before any work; there is no legal, contractual, or investigative need for it. How should the remediator advise the homeowner?

Accepted Answer

Recommend the planned moisture correction and removal without delaying the work for routine species identification.

Answer

Obtain species results first, because containment cannot be selected until the mold organism has been identified.

Answer

Take a single indoor air sample first, because a count below the outdoor count would make removal unnecessary.

Answer

Culture the growth first, because nonviable mold on the gypsum board would not require physical removal.

Question 9

A medically cleared remediator completes an OSHA-accepted quantitative fit test with a tight-fitting, full-facepiece, negative-pressure air-purifying respirator. The reported fit factor is 620. Under a compliant respiratory protection program, how is this result interpreted?

Accepted Answer

The fit test passes; the full-facepiece respirator retains an assigned protection factor of 50.

Answer

The fit test passes; an assigned protection factor of 620 may be used for exposure calculations.

Answer

The fit test fails; 1,000 is the required fit factor for full-facepiece respirators.

Answer

The fit test passes; additional user seal checks are unnecessary until annual retesting.

Question 10

A homeowner asks the same CRMR to assess mold damage and then perform the remediation. Applicable law does not prohibit this arrangement. Which description accurately reflects ACAC's Code of Conduct?

Accepted Answer

It strongly discourages this dual role because of the perceived conflict, but does not categorically prohibit the arrangement.

Answer

It prohibits dual roles even when applicable law permits them and the homeowner gives written consent.

Answer

It eliminates the perceived conflict when separate invoices are issued for assessment and contracting services.

Answer

It treats the arrangement as a conflict only if the assessment overstates the amount of remediation needed.

Free CRMR Practice Questions

Domain 1: Understand the basic principles of microbial remediation as described in the listed reference texts

Question 1

Question 2

Question 3

Domain 2: Maintain familiarity with the equipment and supplies necessary to conduct a microbial remediation project, and with the methods for calibration and operation of such equipment.

Question 4

Question 5

Domain 3: Appreciate the safety hazards presented by microbial remediation projects, and follow the procedures necessary to protect building occupants and remediation workers from such hazards.

Question 6

Question 7

Domain 4: Recognize that microbial remediation may bring the remediator into contact with regulated substances such as lead and asbestos.

Question 8

Domain 5: Properly address water damage in the indoor environment

Question 9

Question 10

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