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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. A building with an exhaust-only ventilation system experiences negative pressure. What moisture-related risk does this create?

    Answer: Outdoor humid air is drawn in through envelope cracks, raising indoor moisture

    Exhaust-only systems depressurize the building, drawing unconditioned outdoor air through uncontrolled pathways that may carry significant humidity.

  2. What is the purpose of weep holes in a brick veneer wall system?

    Answer: To drain bulk water that penetrates behind the veneer to the exterior

    Weep holes at the base of brick veneer allow water that enters the cavity to drain out rather than accumulate against the backup wall.

  3. Which type of insulation is MOST resistant to moisture damage and maintains its R-value when exposed to liquid water?

    Answer: Closed-cell spray foam

    Closed-cell SPF is water-resistant, does not absorb liquid water, and retains its thermal performance even in damp environments.

  4. In hot-humid climates, what is the MOST common error made when installing vapor retarders?

    Answer: Installing the retarder on the exterior warm-in-summer side, trapping moisture during cooling season

    In hot-humid climates, placing an impermeable retarder on the exterior traps moisture driven inward by summer humidity against the cooled interior wall.

  5. What term describes the process by which concrete or masonry foundation walls transmit ground moisture to interior surfaces without bulk water intrusion?

    Answer: Wicking via capillary transport

    Capillary wicking draws liquid water from saturated soil through the porous concrete or masonry to the interior surface.

  6. Which of the following best describes 'interstitial condensation' in a building assembly?

    Answer: Condensation forming within the layers of a wall, roof, or floor assembly

    Interstitial condensation occurs inside a building assembly when moisture migrates into a zone where the temperature falls below the dew point.

  7. When a BPI auditor recommends adding mechanical ventilation to a tight home, what is a key moisture-related reason for this recommendation?

    Answer: To introduce outdoor air that lowers indoor CO2 and dilutes indoor-generated moisture

    Controlled mechanical ventilation dilutes indoor-generated moisture (cooking, bathing, respiration) while providing a measured air exchange rate.

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