Which of the following factors can negatively affect attic ventilation performance?

Lack of ventilation and soffit ventilation covered with insulation directly impacts attic ventilation performance by obstructing the airflow necessary for maintaining a balanced temperature within the attic space. Proper attic ventilation relies on the entry of cooler outside air and the expulsion of warmer, stale air to prevent issues such as heat buildup in the summer and moisture accumulation in the winter.

When soffit vents, which are designed to allow cooler air to enter the attic, are blocked by insulation, it restricts this critical airflow. The result is an attic that can become excessively hot, especially in warmer months, leading to increased cooling costs, potential damage to roofing materials, and an overall reduction in energy efficiency for the building. Properly designed and maintained ventilation systems are essential for ensuring effective airflow, which is why this factor significantly detracts from attic ventilation performance.

In contrast, high exterior temperatures might increase the temperature within the attic but do not inherently obstruct the ventilation system. Routine maintenance of HVAC systems typically has a positive effect on overall building performance, and the presence of triple-glazed windows usually contributes to better insulation and energy efficiency, rather than having a negative impact on ventilation.