Roof Ventilation
A balanced system of intake (soffit) and exhaust (ridge or box) vents that moves air through the attic to manage temperature and moisture.
Quick answer
Roof Ventilation: A balanced system of intake (soffit) and exhaust (ridge or box) vents that moves air through the attic to manage temperature and moisture. Typical cost: $300–$900 added to a reroof for proper ridge and soffit ventilation..
Why it matters
Poor ventilation cooks shingles from below, voids warranties, and causes ice dams. Adding ridge vent during a reroof is one of the highest-ROI upgrades available.
Typical cost
$300–$900 added to a reroof for proper ridge and soffit ventilation.
Pros
- • Extends shingle life 5–10 years
- • Reduces attic temps 20–40°F
- • Prevents ice dams and mold
Cons
- • Requires balanced intake — exhaust alone makes things worse
Common uses
- • Every attic-vented home
Alternatives
Powered attic fans (controversial — can depressurize home)
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Frequently asked questions
- How much ventilation does my attic need?
- Code minimum is 1 sq ft of net free vent area per 150 sq ft of attic, split evenly between intake and exhaust.
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