The core idea
Wind can press air and rain into one side of a house while pulling air out of the opposite side.
How the mechanism works
Positive pressure forms on the windward face and suction zones form at leeward faces, corners and roof edges.
When it becomes relevant
Typical trigger: A repeatable wind direction or storm exposure.
Evidence that supports this interpretation
- One facade or corner is consistently affected
- Severity tracks wind direction more than rainfall total
- Indoor pressure or odor changes with gusts
Evidence that weakens it
- Calm-weather events reproduce the symptom
- The affected face is sheltered and dry
- A plumbing cycle is the stronger trigger
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
Do not perform exterior water testing during strong wind or from unsafe access positions.
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.
US Department of Energy · government homeowner guidanceConsumer Guide to Home VentilationWhole-house and local ventilation, moisture and pollutant control.Verified 2026-07-20 · review due 2027-01-20Open source ↗US Department of Energy · government homeowner guidanceConsumer Guide to Air Sealing the HomeAir leakage, durability, comfort and ventilation coordination.Verified 2026-07-20 · review due 2027-01-20Open source ↗US Environmental Protection Agency · government guidanceIntroduction to Indoor Air QualityIndoor pollutant sources, ventilation and exposure reduction.Verified 2026-07-20 · review due 2027-01-20Open source ↗
Observe→Compare triggers→Repair source→Verify outcome
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