How does proper attic ventilation impact shingle performance?

• A. It reduces heat buildup and moisture in the attic, protecting decking and extending shingle life.
• B. It increases heat.
• C. No effect.
• D. It only affects indoor climate.

Answer: (A)

Proper attic ventilation keeps air moving, which reduces heat buildup and moisture in the attic. Asphalt shingles are designed to withstand sun and weather, but excessive heat from a hot attic accelerates aging of the shingle materials and can cause granule loss, brittleness, curling, and faster deterioration. At the same time, high humidity and condensation in the attic can lead to moisture soaking into the roof deck, promoting mold, rot, and corrosion of fasteners. By letting cooler outdoor air replace the hot, moist attic air through intake vents at the eaves and exhaust vents up high, you lower peak temperatures and keep humidity in check. This helps protect the decking and slows the aging of shingles, extending their life. It isn’t about increasing heat, it isn’t inconsequential, and it’s not solely about indoor comfort—the attic environment directly influences roof performance and longevity.