What percentage of total attic venting should be located at the soffits?

The correct answer is that at least 50% of total attic venting should be located at the soffits. This recommendation is based on the principles of effective attic ventilation, which is essential for preventing moisture buildup and maintaining a balanced airflow within the attic space.

Having a significant portion of the venting at the soffits promotes the intake of cooler outside air, which replaces the warmer, stagnant air that accumulates at the upper areas of the attic. This airflow helps reduce heat buildup and potential condensation issues, protecting the roof structure and insulation from damage. Properly distributing the venting across different areas, with a focus on the soffits, ensures that the attic can ventilate effectively, particularly by facilitating cross-ventilation.

The specific figure of at least 50% serves as a guideline to achieve the best results in terms of air movement in the attic space. This ensures sufficient intake of fresh air, balancing the ventilation system and thereby optimizing performance.