Ventilation is crucial for a residential roof and attic. Moisture and stale air carry many contaminants and pathogens. Without proper attic ventilation, problems such as mold and mildew, structure deteroration, and even an increase in your energy costs can occur. Proper roof and attic ventilation is crucial for maintaining the rated life of shingles. Exhaust fans and proper vents are an efficient and cost effective way to provide ventilation from your roof or attic.