What is a common issue when not adequately ventilating a roof with insulation?

Moisture buildup is a significant concern when a roof is not adequately ventilated, especially in areas with insulation. Proper ventilation helps to regulate temperature and moisture levels in the attic space. When warm, moist air escapes from the living area into the attic but cannot effectively ventilate outside, it can condense on the colder surfaces of the roofing structure.

This excess moisture can lead to several problems, including mold growth, wood rot, and potential damage to roofing materials. Over time, these issues can compromise the structural integrity of the roof and shorten its lifespan. Adequate ventilation ensures that this moist air is expelled and replaced with fresh air, maintaining a healthier environment within the attic and preserving the roofing materials.