Wet Basement and Crawl Space Waterproofing in Gresham

Where Water Gets In Around Gresham

Johnson Creek drops out of the hills south of Gresham and flows through the city's southwest side, and in a wet winter it has a history of overtopping its banks. Houses along that corridor have lived with high groundwater and the occasional flood for generations.

The buttes add a second source. Gresham Butte and the slopes around it shed rain downhill toward neighborhoods below, so water arrives from above while the creek keeps the ground below saturated. Soil is a mix of clay and silt that drains slowly.

The housing stock is wide: older homes from the 1950s through the 1970s near downtown and the creek, and newer subdivisions on the higher and eastern parts of the city. Basements and crawl spaces both appear, and both see water. In low areas, a wet basement or crawl space is a yearly event.

Johnson Creek flooding has shaped the low neighborhoods for as long as there have been houses there, and homeowners know which blocks get wet. A Gresham waterproofing contractor starts near the creek with groundwater, because it is the constant, whether or not the creek overtops its banks. On the slopes near the buttes, the question is runoff from above.

When the Rain Starts Hitting Basements

October rain fills dry soil, and by December the ground near Johnson Creek is saturated. Slopes near the buttes shed water onto lower lots, and runoff flows across yards toward foundations.

In January and February, the creek runs high, and groundwater under nearby streets peaks. Basements show seepage along the floor joint and damp walls, and sump pumps run through the night. Hillside homes see water pooling beside uphill walls.

The wet lasts into spring. A basement that was damp in January stays damp, and mold can grow behind stored items and finished walls. Doing the work in summer, when the ground is dry and trenches stay open, puts the home ahead of the season.

Between storms, the ground does not dry quickly. Clay near the creek and on the lower slopes holds water for days, so a basement can stay damp after the rain has stopped. Floors that feel cool and clammy in March are often the result of weeks of seepage, not one wet day, and a pump that cycles through the night is a sign the system is working.

A site visit covers the basement walls and floor joint, the sump if there is one, the gutters, the way the yard falls, and any crawl space. A moisture meter on the lower wall shows how far the dampness has traveled. That gives you a plan based on measurements, not on guesses about the creek.

Basement and Crawl Space Repairs We Handle Most Here

Most calls fit one of the jobs below, and many need two.

Basement Waterproofing

Homes near Johnson Creek often need interior drain tile and a sump to handle seepage from high groundwater. We cut the slab edge, lay pipe in gravel and tie it to a sealed basin. See basement waterproofing in Gresham.

French Drain Installation

On the slopes near the buttes, a French drain above the house intercepts runoff before it reaches the foundation. We direct it to a safe discharge point away from neighbors.

Sump Pump Installation

Where groundwater reaches the foundation, sump pump installation puts a properly sized pump and basin in to remove it. We add a battery backup because winter storms often cause power outages.

Crawl Space Encapsulation

Some homes sit on crawl spaces, and near the creek those spaces hold standing water under the house in winter. Draining first and then lining the floor and walls ends the musty smell. Read about crawl space encapsulation, and consider a crawl space vapor barrier where the soil is only damp.

Exterior Waterproofing

For walls that have failed badly, excavating and sealing the outside with a membrane and new drain stops water before it enters. Read about exterior waterproofing.

A leaking basement on one wall often needs only foundation crack repair, where epoxy or polyurethane injection closes the crack from inside. Many homes have both a basement and a yard that tilts the wrong way. We look at how the roof drains, where the neighbors' water goes and how the slope behaves in a storm. Some homes need a drain, some a pump, and some both.

The choice between inside and outside comes down to access and cause. If the water is rising from below, as it does near the creek, an interior system with a pump is the direct answer and needs no digging. If the wall itself is taking runoff from a slope, an exterior membrane and drain protect the concrete, but it needs room to dig. On a lot with a deck on one side and a steep bank on the other, we may split the job, with interior drainage now and exterior work later, so the family room is protected sooner.

Neighborhoods We Cover in Gresham

Our Gresham work runs from the blocks near Main Avenue and downtown to the homes off Burnham Road and Hogan Road, around Mt. Hood Community College and along the Springwater Corridor. Neighborhoods near Johnson Creek see the highest groundwater, and streets on the slopes of Gresham Butte see the heaviest runoff.

Waterproofing services in Gresham differ between the low ground and the slopes, and a single house sometimes has both: a basement wall that takes hillside runoff and a floor that takes groundwater. We plan for each source separately and tell you which one is doing the most harm.

Close by, we also take calls in Fairview and Troutdale, where the same creek-fed soils and wet winters apply.

A last point for owners of older homes: the original builders often poured the footing and the wall separately, and the joint between them is a cold joint that leaks long before the wall itself does. Water that appears along the floor edge on a dry-looking wall usually comes from that joint, and an interior drain tile line below the slab is the cleanest way to collect it. Painting the wall does nothing, and neither does patching the floor.

We also see homes where a previous owner added a sump pump that was never connected to a drain. The pump sits in a basin that never fills, while the floor stays wet a few feet away. Connecting the basin to a real drain line is often a small job with a large effect, and it is worth checking before you replace the pump.