Rain reaches the interior through a failed covering, flashing, penetration, joint or drainage detail.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Deterministic building intelligence
Follow the clues.
Follow the clues.
Reduce the uncertainty.
HouseSymptoms ranks likely causes from timing, location, weather and distinguishing evidence. The score is a transparent fit index—not a remote diagnosis.
21 diagnostic profiles31 failure fingerprints32 visual patterns
Active regional intelligenceGlobal baselineNo regional layer is active. Results use the global knowledge graph.
No terminology overrideSelect a regional pack to localize building language.
Open regional pack →Active profile
Brown or yellow ceiling stain
Separate rain entry, plumbing leakage and cold-surface condensation by timing, position and moisture behavior.
See0evidence clues active
Transparent cause ranking
What currently fits—and why
Fit index compares this profile’s evidence. It is not a probability and does not prove a hidden condition.
Water escapes from a supply, drain, appliance connection or seal and appears away from the actual failure.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Moist indoor air reaches a surface below its dew point and deposits liquid water.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Cooling or heating condensate cannot leave the appliance normally.
Evidence supporting it
No strong confirming clue has been added yet.
Evidence weakening it
No direct contradiction is active yet.
Most useful missing evidenceDuct or mechanical equipmentMechanical equipment or ductwork is above the mark.+
Other questions still available
What is directly above it?
The vertical relationship changes the likely pathway.
How does the mark behave?
Active wetting differs from residual staining.
