MRS Moisture Assessment & Detection 4

Question 1

A specialist measures relative humidity at 75% in a basement with an ambient temperature of 65°F. What is the MOST immediate concern?

Accepted Answer

RH at or above 70% creates conditions highly conducive to mold growth

Answer

Relative humidity of 70% or higher is considered elevated and supports mold growth; sustained RH above 60% in enclosed spaces warrants corrective action.

Question 2

Which type of data logger is MOST useful for documenting intermittent moisture conditions in a building over time?

Accepted Answer

A continuous temperature and RH data logger

Answer

Continuous data loggers record temperature and relative humidity over time, revealing patterns and spikes that a single-point measurement would miss.

Question 3

What is 'hygroscopic moisture' in building materials?

Accepted Answer

Moisture absorbed from the surrounding air by materials that attract and hold water vapor

Answer

Hygroscopic materials such as wood, drywall, and cellulose insulation absorb and release moisture from the air depending on ambient relative humidity.

Question 4

When performing a pressure differential test in a building, what does a negative interior pressure relative to exterior indicate?

Accepted Answer

Outside air — potentially carrying humidity or contaminants — is being drawn into the building

Answer

Negative interior pressure causes infiltration of outside air through cracks and gaps, potentially introducing warm, humid outdoor air that can condense on cooler interior surfaces.

Question 5

A pin-type moisture meter gives a reading of 19% on a structural wood beam. According to IICRC S520 guidelines, this reading:

Accepted Answer

Is above the 16% threshold generally considered problematic for structural wood

Answer

IICRC S520 generally recognizes that wood moisture content above 16–19% creates conditions favorable for mold and wood decay, warranting further investigation and drying.

(MRS) Mold Remediation Specialist Practice Test

(MRS) Mold Remediation Specialist Practice Test

MRS Moisture Assessment & Detection 4