Which material should not obstruct attic ventilation openings?

Insulation is the correct answer because it should not obstruct attic ventilation openings in order to maintain proper airflow in the attic space. Adequate ventilation is crucial to regulate temperature, preventing issues such as moisture buildup, mold growth, and damage to roof materials. When insulation blocks ventilation openings, it can hinder the airflow that is necessary for the expulsion of hot air in the summer and moisture in the winter. This could lead to increased energy costs and deteriorating building materials over time.

While other materials like plastic sheeting, drywall, and wood paneling can be used in attic spaces, they generally serve purposes that do not directly involve ventilation. For example, plastic sheeting may be used as a vapor barrier, yet it’s important to ensure it doesn’t obstruct airflow. Drywall is used for finishing walls and ceilings, and wood paneling is decorative; neither should interfere with the essential ventilation system in the attic. Keeping ventilation openings clear of insulation is critical for maintaining the health and performance of the roofing system and overall home.