A wet basement is a water-management problem. In Vancouver, most of the year's rain, roughly 42 inches in an average year, falls from late fall through winter, and the soil around a foundation can stay saturated for months. Saturated soil pushes water against basement walls and up through the floor, an effect called hydrostatic pressure. Basement waterproofing works by controlling that water: keeping it out where that is practical, and giving it a path to drain away where it is not.
Where basement water comes from
- Surface runoff from roofs, gutters and ground that slopes toward the house
- Groundwater that rises after prolonged rain, and that can sit closer to the surface in parts of Vancouver near the Columbia River floodplain
- Cracks and gaps in walls, floors and at the joint where the floor meets the wall
- Window wells, pipe penetrations and old drain lines that let water in or have stopped working
How a basement is waterproofed
Most solutions combine two or three of the following, chosen after the source of the water has been found:
- Better drainage outside: gutters, extended downspouts and grading that move roof and surface water away from the foundation
- Interior drainage: a channel or drain pipe at the footing that collects water and sends it to a sump
- Sump pump: removes the collected water and discharges it away from the house
- Crack and joint sealing: stops active leaks at the point of entry
- Exterior waterproofing: excavation to the footing, sealing the wall and adding drainage, for cases where water must be stopped before it reaches the wall
Interior or exterior?
Interior systems collect water that reaches the foundation and route it to a sump. They are less disruptive, and they suit finished basements and tight sites. Exterior waterproofing treats the water before it reaches the wall, but it means excavating around the foundation, so it is a larger job. Many problems are solved, or greatly reduced, by correcting drainage outside first. The right choice depends on what the inspection finds.
Signs your basement needs attention
- Dampness or water along the base of the walls, or on the floor after rain
- A musty smell that gets stronger in wet weather
- White, chalky mineral deposits on masonry, called efflorescence
- Peeling paint, bubbling finishes or rusting metal near the floor
- Mold or mildew on walls, stored items or finishes
- A sump pump that runs constantly, or a pit that fills and has no pump
How we find the cause
To recommend the right fix, we look at the basement, the grading and gutters outside, the sump pit if there is one, and when and where the water appears. Water that shows up only after storms points toward surface water. Water that keeps coming in during dry weather points toward groundwater or a leak. Getting that right is what keeps you from paying for a system that does not match the problem.
Related services, guides and areas
- Often combined with: interior waterproofing solutions, sump pump installation, exterior drainage systems and foundation waterproofing
- Guides: signs of moisture problems after heavy rain and soil, groundwater and drainage near the Columbia River
- Where we work: Hazel Dell, Orchards, Felida, Uptown Village and Downtown Vancouver
Have a wet basement and not sure what it needs? Contact us and describe what you see.
Basement Waterproofing Services We Offer
✓Interior Drainage System
A channel or drain pipe along the footing inside the basement collects water that reaches the foundation and carries it to a sump.
✓Exterior Waterproofing and Drainage
Excavation to the footing, sealing the wall and adding drainage to stop water before it reaches the foundation. A larger job, used when it is the right answer.
✓Foundation Crack and Joint Sealing
Injection or sealing of active cracks and the floor-wall joint to stop leaks at the point of entry.
✓Sump Pump Installation
A sump pit and pump with a check valve and a discharge line routed away from the foundation, with an option for battery backup.
✓Window Well and Penetration Sealing
Drainage and sealing at window wells and where pipes and cables pass through the wall.
✓Moisture and Humidity Control
Dehumidification and ventilation advice to control the humidity that remains after water entry has been dealt with.
Basement Waterproofing Cost in Vancouver, WA
| Service | Typical Range | What Affects It |
|---|---|---|
| Interior drainage system | Call for an estimate | Depends on the length of wall that needs drainage and on the floor and finishes. |
| Sump pump installation | Call for an estimate | Depends on whether a pit and discharge line exist, and on battery backup. |
| Crack and joint sealing | Call for an estimate | Depends on the number and length of cracks and where they are. |
| Exterior waterproofing | Call for an estimate | Depends on depth, access and how much of the foundation is involved. |
Ranges are typical for Vancouver, WA and confirmed with an exact written quote before any work starts.
How it works
- 1
Inspection
We look at the basement, the outside grade and gutters, any sump, and the history of when water appears.
- 2
Finding the source
We work out whether the water is surface runoff, groundwater or a leak, because that decides the fix.
- 3
Explaining the options
We explain what we found and the options that fit, including what each does and does not solve.
- 4
Installation and testing
We carry out the agreed work and test drains and pumps where they are installed.
Pricing
Cost depends on the size of the basement, how much water is involved, access and the method needed. We give an estimate once we have seen the problem.