BPI Moisture Management 3

Question 1

What term describes the movement of liquid water through a porous material driven by capillary action?

Accepted Answer

Capillary suction

Answer

Capillary suction (capillary rise) is the movement of liquid water through pores driven by surface tension and adhesion forces.

Question 2

Which material property BEST describes a material's ability to absorb and release moisture to buffer indoor humidity levels?

Accepted Answer

Hygroscopicity

Answer

Hygroscopicity describes how readily a material absorbs and releases moisture from the air, acting as a humidity buffer.

Question 3

During a BPI assessment, a technician measures 70% relative humidity in a basement at 65°F. What is the MOST appropriate immediate recommendation?

Accepted Answer

Seal air leaks from outdoors and add dehumidification

Answer

High basement RH is primarily controlled by sealing air pathways bringing humid outdoor air in, combined with mechanical dehumidification.

Question 4

What is the primary moisture risk associated with spray polyurethane foam (SPF) applied to the interior of a basement wall?

Accepted Answer

SPF reduces the wall's drying potential to the interior

Answer

Closed-cell SPF on the interior blocks moisture from drying inward, potentially trapping moisture in the concrete or masonry wall.

Question 5

Which window condition BEST indicates that indoor relative humidity is consistently too high in winter?

Accepted Answer

Condensation on the interior pane of double-pane windows

Answer

Interior condensation on double-pane windows signals that indoor RH is high enough to reach the dew point at the cold glass surface.

(BPI) Building Performance Institute Certified Practice Test