Define the question before measuring
Cladding is rarely the only water barrier; hidden layers must collect and drain water that passes the exterior surface.
Capture a useful baseline
Record the exact location, date, current weather or equipment state, recent activities and the first visible, audible, sensory or measurable change. Keep one unaffected reference point.
Safe observations to repeat
- Map penetrations and horizontal transitions
- Photograph lower drainage exits
- Use targeted opening rather than random sealant
Compare supporting and weakening evidence
Supports the pathway
- Damage appears below an interface
- Multiple cladding joints feed one area
- The cavity lacks drainage or termination details
Weakens the pathway
- The wall remains dry through exposure
- The symptom is condensation-only
- A plumbing source is confirmed
Interpret the result conservatively
Look for a repeatable relationship between trigger, location, timing and change. Treat exceptions as useful evidence rather than forcing every event into one explanation.
Escalation boundary
Broad caulking can block drainage and worsen concealed wetting.
Close the loop
If work is performed, repeat the same observation under a comparable trigger and through the original lag window. Record both recurrence and non-recurrence events.
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.
