Roof Ventilation
A roof is a breathing system. Without proper intake and exhaust, trapped heat can lead to ice dams in the winter and premature roof failure in the summer. We calculate your attic’s specific ventilation needs to ensure your investment stays cool, dry and protected for decades.
Why Ventilation Matters in Our Climate
Most homeowners don’t realize that a roof’s worst enemy isn’t just the rain — it’s trapped heat. Proper attic ventilation is critical to balancing your home’s temperature. Without it, heat builds up, snow melts unevenly and ice dams form, leading to structural damage and leaks.
While we recommend consulting an insulation specialist to keep the heat inside your living space, our job is to make sure your roof has the intake and exhaust it needs to stay cool and dry.
The 1/300 Rule
Most authorities recommend a minimum ventilation ratio of 1/300 of the total horizontal roof area. We calculate the net free ventilation area (NFA) your roof needs using this guideline — see our Roof Smart ventilation calculator for a quick estimate.
Signs Your Ventilation Is Failing
- Delaminating plywood — layers of the roof deck starting to separate from trapped humidity
- Rusty H-clips — rust on the metal clips between plywood sheets signals inadequate exhaust
- Winter ice girdles — heavy ice buildup directly above the gutter line
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- Your property address or postal code
- What the roof needs — repair, replacement, maintenance, inspection or ventilation
- Your timing, and photos if you have them