Is Your Attic Breathing? Attic Ventilation
Poor attic ventilation bakes shingles in summer and causes frost and ice dams in winter. Learn the signs and how The Great House fixes it.
ROOFING
11/28/20263 min read
ASK MASON · ROOF
Is Your Attic Breathing? How Attic Ventilation Protects Your Roof
Mason shows how your attic should breathe, the warning signs, and how we fix the airflow.
A hot attic can cook your roof from the inside.
Watch Mason’s video, then read how a healthy attic breathes, the warning signs, and how we fix it.
IN THIS GUIDE
01
What Mason Checks
How a Healthy Attic Breathes
SOFFIT VENTS
Cool air comes in under the roof edge.
RISING AIR
Warm air rises through the attic.
RIDGE VENT
Heat and moisture leave at the top.
A healthy attic breathes. Cool air comes in through soffit vents under the roof edge.
As it warms up, it rises and leaves through a ridge vent at the very top, carrying heat and moisture out.
When insulation blocks the soffits, or there’s no ridge vent, the air gets trapped.
Mason’s diagram: cool air in at the soffits, hot air out at the ridge
An attic that can’t breathe works against your roof all year.
02
Warning Signs
Signs Your Attic Can’t Breathe
VERY HOT ATTIC
Extreme heat in summer.
FROST OR MOLD
Frost or mold on the roof wood.
ICICLES
Icicles and ice along the gutters.
In summer, the attic gets extremely hot and the shingles bake from below.
In winter, warm, wet air turns into frost on the roof wood, mold grows, and snow melts and refreezes at the edge, forming ice dams.
Check this today
Look into the attic at the roof edges: you should see daylight or vent channels at the soffits, not insulation stuffed tight against the roof.
03
How We Fix It
A Vent Upgrade Now, or a New Roof Later
We check every vent and the insulation. We clear the soffits, add baffles so air can flow, install a ridge vent, and seal air leaks from the house below.
Caught early vs. caught late
Caught early, it’s a vent upgrade. Caught late, it’s mold removal and a new roof.
In Northern Virginia
Code sets attic vent area at 1/150 of the attic floor area, or 1/300 when part of the venting is high on the roof. Northern Virginia’s hot summers and freezing winters make both ends of that problem real. We fixed this on our Rock Church Hill Rd project in Stafford.
Planning a bigger project?
Getting a new roof? We check and balance attic ventilation as part of every replacement. See prices and real projects on our roofing page.
The fix: soffits cleared, baffles added, ridge vent and air sealing
ASK MASON · ROOF
Want to know another problem?
SPOTTED ONE OF THESE SIGNS?
We’ll check it before it turns into a big repair
Free in-home visit from a Class A licensed team. We check the problem, your roof and your attic, then give you a clear written plan.
ABOUT THE AUTHOR
The Great House team
Written by the team at The Great House LLC, a Class A licensed builder and remodeler in McLean, VA (License #2705197237). We have renovated 30+ Northern Virginia homes since 2022.
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See prices, real photos and how we work: our roofing page. Real projects: our project gallery.
Serving McLean, Vienna, Great Falls, Fairfax, all of Northern Virginia.