What are common signs of inadequate attic ventilation during inspection?

• A. Excessive attic heat, moisture buildup, dew condensation, warped decking, and premature shingle curling or buckling.
• B. Cool attic and dry decking.
• C. No signs.
• D. Only dust on rafters.

Answer: (A)

Inadequate attic ventilation shows up when heat and moisture build up in the attic. The signs inspectors look for include excessive attic heat, moisture buildup, dew condensation on surfaces, warped or bowed decking, and shingles that curl or buckle prematurely. This happens because poor airflow traps hot air and damp indoor moisture, which over time damages the roofing system: the decking can warp from moisture and heat, and asphalt shingles lose flexibility and can distort at the edges, leading to curling or buckling. A cool attic with dry decking points to adequate ventilation, so that option doesn’t fit poorly ventilated conditions. No signs would also be inconsistent, since lack of ventilation typically produces noticeable heat and moisture-related issues. Dust on rafters by itself isn’t a reliable indicator of ventilation problems.