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Common Water Issue in BC
Exterior Wall Staining — Building Envelope Water Damage
Staining on exterior walls of BC buildings indicates water running down the facade from a source above, suggesting building envelope failure.
Possible Causes
- •Failed flashing at roof-wall junction
- •Clogged or overflowing gutter above stained area
- •Failed caulking at window or door head flashing
- •Damaged or missing siding allowing water behind
- •Ice damming in winter forcing water under siding
Recommended Steps
- 1Photograph staining and note location relative to roof, gutters, and windows above
- 2Clean gutters above stained area and ensure downspouts are clear
- 3Inspect caulking and flashing at penetrations above stain
- 4Monitor if stain reappears after cleaning following rain
- 5Call professional building envelope assessment with drone thermal if accessible
Related Services
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