CMA CMA Moisture & Building Science 2

Question 1

What does the term 'Equilibrium Moisture Content' (EMC) mean in the context of building materials?

Accepted Answer

The moisture level at which a material neither gains nor loses moisture to the surrounding air

Answer

EMC is the point at which a hygroscopic material's moisture content is in balance with the relative humidity of the surrounding environment.

Question 2

Which psychrometric property represents the total heat content (sensible + latent) of moist air?

Accepted Answer

Enthalpy

Answer

Enthalpy (measured in BTU/lb or kJ/kg) represents the total heat energy in moist air including both sensible heat and latent heat of water vapor.

Question 3

In a hot-humid climate like Florida, where should the vapor retarder be placed in a wall assembly?

Accepted Answer

On the exterior (warm-in-summer) side

Answer

In hot-humid climates, the dominant moisture drive is inward (from hot, humid exterior), so the retarder belongs on the exterior side.

Question 4

What is the term for water moving upward through concrete or masonry due to capillary action?

Accepted Answer

Rising damp

Answer

Rising damp describes the upward migration of ground moisture through porous masonry or concrete via capillary action.

Question 5

Which window condition is a reliable indicator of high indoor relative humidity and potential mold risk?

Accepted Answer

Condensation on interior pane in winter

Answer

Condensation forming on the interior surface of windows in winter indicates indoor relative humidity is high enough that the glass surface has reached dew point.

(CMA) Certified Mold Assessor Practice Test

(CMA) Certified Mold Assessor Practice Test

CMA CMA Moisture & Building Science 2