Interiors, Insulation & Ventilation Flashcards
7 cards from real ASHI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Interiors, Insulation & Ventilation flashcards as text
A home inspector finds that attic insulation covers the soffit vents. What is the PRIMARY concern?
Answer: Blocked vents restrict airflow causing moisture and heat buildup
Blocking soffit vents restricts the intake of fresh air needed for proper attic ventilation, which can cause excessive heat and moisture accumulation leading to structural damage and mold.
Which condition in a basement would MOST indicate inadequate vapor retarder installation on a crawl space floor?
Answer: Condensation and standing water on the crawl space floor
Condensation and standing water on the crawl space floor indicate that ground moisture is not being controlled by a vapor retarder, allowing moisture to migrate upward.
An inspector observes that interior door frames show diagonal cracks at the corners. What condition does this MOST likely indicate?
Answer: Differential foundation settlement causing racking
Diagonal cracks radiating from door corners typically indicate racking stress caused by differential settlement or structural movement that distorts the door opening.
What is the MINIMUM net free ventilation area ratio typically required for attic spaces using both ridge and soffit vents?
Answer: 1/300 of the attic floor area
When balanced ridge and soffit ventilation is provided with a vapor retarder, the minimum net free area is 1/300 of the attic floor area per model building codes.
A home inspector finds batt insulation installed between floor joists over an unheated garage with the vapor retarder facing DOWN toward the garage. What should the inspector note?
Answer: This is incorrect; the vapor retarder should face UP toward the warm living space
The vapor retarder should face the warm-in-winter side, which is the heated living space above, so it faces upward to prevent moisture from the living area from entering the insulation.
Which type of ceiling stain pattern is MOST associated with air leakage rather than bulk water intrusion?
Answer: Dark gray or black spots following joist lines at wall-ceiling junctions
Dark gray or black ghosting stains along framing members or at wall-ceiling junctions are caused by airborne particles filtering through air leakage paths, not liquid water.
When inspecting a home with a cathedral ceiling, what ventilation method is acceptable to provide airflow from eave to ridge?
Answer: Providing a continuous air channel of at least 1 inch between insulation and roof sheathing
A continuous 1-inch (minimum) ventilation channel between the insulation and roof sheathing allows air to flow from soffit to ridge, preventing moisture and heat buildup in cathedral ceiling assemblies.