Serving Portland
Groundwater & Basement Water Intrusion in Portland, OR
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
Is moss on the roof putting water into the house or just sitting there?
It is putting water in once it holds a pond on the shingle. A thick moss patch keeps that spot wet through a season that already offers little chance to dry, and it lifts shingle edges as it thickens. The plant is not cutting the roof; the water it retains finds the deck. Clear the debris, keep gutters open, and extract any ceiling that has already taken that drip before the next December cell adds to it.
Should a Portland crawlspace be vented all winter?
Usually not, if the goal is a dry joist. Bringing in outside air that is already near saturation does not dry a crawl; it exchanges damp air for damp air and condenses on cold wood. Closing the vents in the wet season and running a dehumidifier is what actually pulls moisture out of the framing. A local pro can meter the joists and say whether the space needs mechanical drying or just a closed envelope.
Why do basement problems show up in February rather than during a December storm?
Because the mechanism is cumulative. It is not one downpour overwhelming a drain; it is soil that has been holding water since November finally reaching the point where the undamp-proofed wall cannot resist it. The wet patch appears in midwinter because that is when the ground is at its wettest. Extraction still starts with the standing water; the lasting fix is getting roof water off that wall for the rest of the season.
These questions come from the Portland page.