Below grade
Basements, seepage, and damp floors
Not every wet basement in Vancouver is a failed foundation. Some of it is condensation on cold concrete. Some of it is rainwater looking for the easiest path in.
Below-grade rooms in BC deal with two different waters. Liquid water moves through cracks, the cold joint where wall meets footing, window wells, and poorly drained soil. Water vapor condenses on cold concrete when indoor air is humid. Treatments that fix one can fail the other.
Read the stains
White powder (efflorescence) on lower walls is mineral left behind by water moving through masonry. Tide marks and peeling paint at the base of a wall suggest repeated wetting. Mold concentrated on the ceiling near a duct is more likely an indoor humidity or HVAC issue than a foundation leak.
After a heavy rain, walk the exterior. Downspouts dumping beside the wall, soil sloped toward the house, and clogged window wells create indoor symptoms that look like “waterproofing problems” and are often grading problems.
Interior vs exterior work
Interior drainage and a sump can keep a finished basement usable even if the wall still gets wet on the soil side. Exterior excavation and membrane work addresses the source but costs more and is not always possible on tight lots or strata. Paint-on “waterproofing” over damp interior concrete usually traps moisture or peels.
Suites and insurance
Many Metro Vancouver homes have secondary suites. A damp basement suite is both a health issue and a rental issue. Photograph conditions, fix drainage first, and be cautious about covering wet walls with new drywall before the source is dry. Insurers care about long-term seepage versus sudden burst pipes — they are not the same claim.