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Moisture Management Flashcards

7 cards from real BPI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Moisture Management flashcards as text

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

    Answer: Capillary suction

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

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

    Answer: Hygroscopicity

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

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

    Answer: Seal air leaks from outdoors and add dehumidification

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

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

    Answer: SPF reduces the wall's drying potential to the interior

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

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

    Answer: Condensation on the interior pane of double-pane windows

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

  6. What is the purpose of a capillary break between a concrete foundation wall and wood sill plate?

    Answer: To prevent liquid water wicking from concrete into the wood

    A capillary break (such as sill seal foam or a gasket) stops liquid water from wicking up from the porous concrete into the wood sill plate.

  7. In mixed-humid climates, which vapor retarder strategy is considered MOST flexible for managing seasonal moisture drive reversal?

    Answer: Variable-permeance (smart) vapor retarder

    Variable-permeance smart retarders tighten in dry conditions and open up in humid conditions, accommodating seasonal moisture drive reversals.