The core idea
New windows, insulation, finishes or ventilation can alter pressure, temperature and drying even when the new work is not visibly defective.
How the mechanism works
Changing one layer shifts the balance of air leakage, vapor resistance, heat flow and moisture storage.
When it becomes relevant
Typical trigger: After energy upgrades, room reconfiguration or new finishes.
Evidence that supports this interpretation
- Symptoms begin after the renovation
- Old and new assemblies meet nearby
- Ventilation or heating behavior changed
Evidence that weakens it
- The symptom predates the work
- A direct unrelated leak is confirmed
- No relevant layer changed
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 reverse or perforate controlled layers without understanding the whole assembly.
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.
