CMR Moisture Control & Building Science

Question 1

What is the primary driver of mold growth in buildings?

Accepted Answer

Presence of moisture or water

Answer

Moisture is the single most critical factor for mold growth; without adequate water activity, mold cannot colonize or proliferate regardless of other conditions.

Question 2

Which relative humidity (RH) level is generally considered the threshold above which mold growth risk increases significantly indoors?

Accepted Answer

60%

Answer

Most guidance, including EPA recommendations, identifies sustained indoor RH above 60% as a condition that significantly promotes mold colonization on common building materials.

Question 3

In building science, what is the 'dew point'?

Accepted Answer

The temperature at which air becomes saturated and moisture condenses

Answer

The dew point is the temperature at which a given parcel of air reaches 100% relative humidity and water vapor begins to condense into liquid on surfaces.

Question 4

A vapor barrier installed on the wrong side of a wall assembly in a cold climate can:

Accepted Answer

Trap moisture within the wall cavity and promote mold

Answer

In cold climates, placing a vapor retarder on the cold (exterior) side traps interior moisture-laden air within the wall cavity, causing condensation and creating ideal conditions for mold growth.

Question 5

Which of the following is a common intrusion pathway for liquid water into a building that a mold remediator should assess?

Accepted Answer

Roof flashing failures and foundation cracks

Answer

Roof flashing failures and foundation cracks are primary bulk water intrusion points that introduce liquid water directly into the building envelope, often leading to hidden mold growth.

CMR - Certified Mold Remediator Practice Test

CMR - Certified Mold Remediator Practice Test

CMR Moisture Control & Building Science