Water ingress and leak diagnosis in Vancouver buildings

Water ingress is water getting past the building envelope: through windows, walls, roof details, joints, or below-grade concrete, into places designed to stay dry. It is different from a plumbing leak, which comes from a pipe inside the building, and from condensation, which forms when indoor moisture hits a cold surface. On Metro Vancouver buildings, ingress usually enters at a detail such as a flashing, joint, or termination rather than through the middle of a wall.

Finding a leak source starts with the pattern, not the stain. Note when the leak runs (only in wind-driven rain, or constantly), which elevation of the building faces the weather, and what sits above and outside the stain. Water travels along framing and membranes before it shows, so the entry point is usually higher and further away than the damage. From there, moisture testing and small exploratory openings confirm the path before any repair is scoped.

Vancouver buildings leak often because the exposure is severe and part of the building stock was built for a drier climate. The city gets well over a metre of rain in an average year, much of it arriving as wind-driven storms off the Strait of Georgia that push water sideways into walls and window joints. Add the face-sealed assemblies of the leaky condo era, decades of UV on sealants, and coastal freeze-thaw on the North Shore, and ingress is a routine finding.

The leaky condo crisis was a wave of building envelope failures across BC, concentrated in Lower Mainland wood-frame condos built from the 1980s through the late 1990s. Face-sealed stucco walls, missing flashings, and poor detailing let rain into wall assemblies that could not dry, causing rot on a huge scale. Hundreds of buildings needed full envelope remediation, and the repair bill ran into the billions. It is why rainscreen construction became standard practice in coastal BC.

BC's mandatory 2-5-10 home warranty on new homes includes building envelope coverage, and water penetration defects fall under that envelope component. The envelope coverage runs five years from the start of the warranty, which is why envelope condition reviews before the five-year mark matter so much for newer stratas: ingress found and documented inside the window can become a warranty claim instead of a special levy. The details of any specific claim depend on the policy documents.

Responsibility for a leak in a strata building usually follows where the water enters, not where the damage shows. The envelope, including exterior walls, windows in many strata plans, roofs, and decks, is typically common property maintained by the strata corporation, while finishes inside a suite are typically the owner's. The strata plan and bylaws decide the split for each building, so the practical first step is always the same: report it to council in writing and get the source diagnosed.

Active water ingress sits between emergency and maintenance, and the volume decides which. Water running during a storm, spreading across a ceiling, or near electrical fixtures needs same-day containment and documentation. A faint stain that has not changed in months can wait for a scheduled assessment. What ingress never is, is self-resolving: the entry point does not close on its own, and every wet season enlarges the damage behind the finishes.

The surface can dry; the problem does not. Between storms, a stain may fade and a wall may read dry at the surface while the sheathing, insulation, and framing behind it stay wet, because wall assemblies dry far more slowly than they wet. Wood-frame construction that stays damp grows rot and mould, and concrete that stays wet feeds rebar corrosion. A leak that "went away" in July almost always comes back with the October storms, larger.

Water ingress comes from outside through the envelope; condensation is indoor moisture turning to water on a cold surface. They can look identical on a wall or window. The tells: condensation tracks weather cold snaps and indoor humidity, shows on window glass and cold corners, and appears across many suites at once. Ingress tracks rain events and wind direction, and concentrates near a specific detail. Diagnosing which one you have comes before any repair, because the fixes are completely different.

A leak does not mean the whole envelope has failed. Most ingress on Metro Vancouver buildings enters at one detail: a cracked sealant joint, a blocked scupper, a missing kickout flashing, a lifted membrane termination. The envelope around it can be sound. That is the case for diagnosing before repairing: a targeted joint or flashing repair, done early, is a maintenance item, while the same water left running for years can turn into a wall assembly rebuild.

High-rise leak investigation mostly runs on ropes. IRATA or SPRAT certified rope access technicians rig from engineered roof anchors on two independent lines under WorkSafeBC Part 11 fall protection rules, and descend the elevation to inspect and test the suspect details up close. That keeps sidewalks open and avoids scaffolding or swing-stage costs for what is often a few drops of inspection and testing. Scaffold only enters the picture when the repair itself needs sustained access.

A reported leak deserves a same-week response even when it looks minor, because the report is usually late: by the time water shows inside a suite, it has been in the assembly for a while. Log the report in writing, photograph the damage, note the weather at the time, and get eyes on the likely exterior details. Quick, documented response also protects the strata if the leak later becomes an insurance or warranty matter.