The core idea
Adding vents cannot compensate for large indoor air leaks, and air sealing cannot replace required roof ventilation.
How the mechanism works
Ventilation removes some heat and moisture while air sealing reduces the moisture load entering the attic.
When it becomes relevant
Typical trigger: Frost, condensation or uneven snow melt.
Evidence that supports this interpretation
- Bypass points align with damage
- Vent openings are blocked or poorly distributed
- The roof has mixed warm and cold zones
Evidence that weakens it
- A direct roof leak is documented
- The attic is conditioned by design
- No moisture accumulation exists
What this concept cannot prove alone
A single observation, image or meter reading cannot confirm the complete failure pathway. Use this concept to form better questions, compare alternatives and decide which safe observation would be most informative next.
Safety and professional boundary
Changes should follow the actual roof and attic design rather than a universal vent-count rule.
Primary references for this topic family
These references ground the general building-science or safety context. They do not diagnose a specific house, replace local requirements or certify a repair.
