The core idea
A repair should be tested against conditions reasonably comparable to those that produced the original symptom.
How the mechanism works
Intermittent failures may remain invisible under mild or unrelated conditions.
When it becomes relevant
Typical trigger: Post-repair rain, fixture use, HVAC cycle or seasonal condition.
Evidence that supports this interpretation
- Trigger direction and intensity are recorded
- Observation method matches baseline
- Enough time has elapsed for the original lag
Evidence that weakens it
- Only a visual check was made
- Conditions were much milder
- The symptom had a seasonal cycle
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 create unsafe artificial tests such as uncontrolled flooding, pressure or electrical loading.
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.