CMA CMA Moisture & Building Science 3

Question 1

Which ASHRAE standard provides guidance on ventilation rates to maintain acceptable indoor air quality and control moisture?

Accepted Answer

ASHRAE 62.1

Answer

ASHRAE 55

Answer

ASHRAE 90.1

Answer

ASHRAE 110

Question 2

What is the primary function of a rain screen wall system in relation to moisture control?

Accepted Answer

To create a drainage and drying space between cladding and the weather-resistant barrier

Answer

To eliminate the need for a vapor barrier

Answer

To insulate the exterior wall from thermal bridging

Answer

To reflect solar radiation away from the wall assembly

Question 3

What moisture measurement unit is commonly used to express the permeance of vapor retarders?

Accepted Answer

Perm

Answer

Grain

Answer

Aw (water activity)

Answer

RH%

Question 4

In building diagnostics, what does a blower door test primarily measure?

Accepted Answer

Overall air leakage rate of the building envelope

Answer

Moisture content of wall assemblies

Answer

HVAC system airflow balance

Answer

Radon entry pathways

Question 5

Which type of crawl space design is recommended by building science experts to minimize moisture and mold problems?

Accepted Answer

Conditioned (sealed) crawl space with vapor barrier on the ground

Answer

Vented crawl space with screened foundation vents

Answer

Open crawl space with perimeter drainage only

Answer

Flooded crawl space that equalizes with groundwater

Question 6

What is the significance of 'thermal bridging' to mold risk in building assemblies?

Accepted Answer

It increases condensation risk at cold spots on interior surfaces

Answer

It improves drying potential by warming the assembly

Answer

It reduces vapor drive through the wall

Answer

It has no relationship to mold growth potential