Roof Ventilation 101: Why Proper Attic Airflow Protects Your Roof (and Wallet)

Proper attic ventilation is one of the least visible—and most important—parts of a healthy roof system. Without it, heat and moisture build up in the attic, warping decking, aging shingles early, driving up energy bills, and inviting mold. In cold climates like New Jersey and New York, poor ventilation also contributes to ice dams.

How ventilation works

Ventilation should be balanced: cool air enters at the soffits (intake) while warm, moist air exits at the ridge (exhaust). This continuous airflow helps keep attic temperature and humidity closer to outdoor levels year‑round.

Problems caused by poor airflow

• Premature shingle aging: trapped heat bakes shingles from below.
• Moisture and mold: daily activities add humidity; without exhaust, condensation forms on framing.
• Ice dams: warm attics melt snow that re‑freezes at cold eaves, backing water under shingles.
• Higher energy use: super‑heated attics make AC work harder.

Best‑practice solutions we install

• Ridge vent + soffit intake (e.g., GAF Cobra®) for continuous, low‑profile airflow.
• Baffles/rafter vents to keep insulation from blocking soffits.
• One exhaust type per attic space (avoid mixing box vents with ridge vent).
• Right net‑free area (NFA): typically 1:150 or 1:300 with vapor barrier—our team sizes this for your home.

Signs you may have a ventilation issue

Hot upstairs rooms, musty attic odors, wavy roof sheathing, winter icicles along eaves, or repeated shingle failures.

Why Donny’s
As a GAF Master Elite® contractor, we design ventilation as part of the roof system, not an add‑on. That means manufacturer‑approved components, correct layout, and compliance with warranty requirements.

CTA: Need a ventilation check with your roof? Free estimates 7 days a week.
(973) 333‑6364 • sales@donnysroofing.com