The core idea
Framing, metal and compressed insulation can create colder surface stripes or spots that collect condensation or dust.
How the mechanism works
More conductive paths bypass insulation, lowering interior surface temperature and changing local air movement.
When it becomes relevant
Typical trigger: Cold outdoor weather or strong cooling conditions.
Evidence that supports this interpretation
- Pattern follows studs, corners or metal fasteners
- Thermal images repeat under similar conditions
- Dust or moisture forms at colder lines
Evidence that weakens it
- The pattern changes with rain only
- No temperature contrast exists
- The mark is random and unrelated to framing
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
Thermal images should not be treated as moisture proof without corroborating evidence.
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.
