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Foundation Waterproofing in Spokane, WA
Foundation walls wicking moisture, weeping at tie-rod holes or showing efflorescence? Call now and we'll connect you with an independent, licensed and insured contractor in Spokane who seals foundations below grade, for new builds and existing homes.
Call +1-866-476-1348Free referral, 24/7
- True waterproofing membranes, not just damp-proofing
- New builds and existing homes
- Written pricing before any excavation
- Free referral service
- Independent, insured contractors
- Upfront written pricing
- Open around the clock
The Problem
Damp-Proofing Isn't Waterproofing
Many builders apply only a thin asphalt damp-proofing coat, which code allows but which doesn't stop water under pressure. Damp-proofing slows vapor. It doesn't bridge cracks, and it breaks down over time in wet soil. Once the soil around the house saturates, water pushes through shrinkage cracks, tie-rod holes, form joints and pipe penetrations.
Concrete block is even more vulnerable. The mortar joints and hollow cores soak up moisture, which shows up as white efflorescence, peeling paint and a constant damp feel. Proper foundation waterproofing turns the wall into a real barrier with membranes and drainage built for water pressure.
For new homes, it's far cheaper to do it right before backfill. For existing homes, contractors can excavate and retrofit, or combine targeted exterior work with interior drainage.
- Weeping at tie-rod snap-ties
- Moisture at pipe and utility penetrations
- Efflorescence and wicking on block walls
- New construction needing below-grade protection
Matching the Waterproofing System to the Soil
Not every foundation faces the same water. A house on sandy, well-drained soil with a low water table needs good protection and a working footing drain, but it isn't fighting constant pressure. A house on dense clay, a low lot or a site with a seasonal high water table has water sitting against the wall for weeks. That second house needs a heavier membrane, a drainage board with real flow capacity and a footing drain that can keep up.
For most homes, a spray-applied rubberized membrane is the go-to. They go on seamless, wrap around tie-rods and penetrations, and bridge hairline cracks. The key quality check is thickness: the crew should measure wet film thickness as they go, because a membrane applied too thin won't perform as rated.
Commercial foundations and tough sites often get sheets or bentonite. Sheets give a consistent factory thickness, which helps on large wall areas. Bentonite swells when it gets wet and seals small gaps on its own, though it needs to be confined by backfill to work properly.
Membrane and drainage work as a pair. Drainage board and a footing drain take the pressure off, so the membrane only has to deal with water that's already moving away. Skipping drainage to save money is one of the most common reasons foundation waterproofing fails early.
What drives the price is mostly how hard the wall is to reach. On new construction, with the walls already exposed, you're paying for materials and application. On an existing home, excavation, hauling, shoring for deep trenches and restoring landscaping usually make up the larger share of the bill. A contractor should break those pieces out separately so you can see where the money goes, and so you can compare a full-perimeter job against sealing only the walls that actually leak.
Why Choose Us
Why Homeowners Call Us for Foundation Waterproofing in Spokane, WA
Foundation waterproofing is a materials job as much as a labor job.
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Upfront Flat-Rate Pricing
Pricing is written by wall section or linear foot, with membrane type, drainage board and footing drain called out separately.
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Fast Local Dispatch
Builders on a schedule and homeowners with active seepage both get quick scheduling from contractors who work in Spokane.
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Specialized Tools & Equipment
Spray equipment for rubberized membranes, mil gauges to check thickness, surface prep gear and injection ports for tie-rods.
Solutions
What Proper Foundation Waterproofing Includes
Each layer does a specific job. Together they keep the wall dry.
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Spray-Applied Waterproofing Membranes
A thick, seamless rubberized asphalt or polymer membrane is sprayed or rolled onto the cleaned wall at a specified mil thickness. It stretches to bridge small cracks that would split ordinary damp-proofing.
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Self-Adhered Sheets and Bentonite Panels
Self-adhering sheet membranes give a consistent factory thickness, and bentonite clay panels swell when wet to seal themselves. Both are common on commercial foundations and high water table sites.
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Dimpled Drainage Board
A dimpled drainage board over the membrane protects it from rocks during backfill and gives water a free path down to the footing drain, relieving pressure on the wall.
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Footing Drain Installation
A gravel-bedded, filter-wrapped drain at the footing carries water away so the membrane isn't holding back a saturated trench.
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Sealing Tie-Rods and Pipe Entries
Snap-tie holes and utility penetrations get injected or sealed with flexible materials that move with the wall.
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Block Wall Sealing and Parging
A cement parge coat fills block joints and gives the membrane a solid, smooth surface to bond to.
Why Some Foundation Waterproofing Fails Early
Most foundation waterproofing failures trace back to a handful of shortcuts. The first is skipping surface prep. A membrane applied over dirt, loose parging or form release oil won't bond, and water gets behind it within a few seasons. The second is applying it too thin. Fluid membranes are rated at a specific thickness, and a crew in a hurry can easily put on half that.
The third is leaving out the drainage board, which lets sharp backfill puncture the membrane and leaves water pressing against the wall instead of draining down. The fourth is a footing drain with no outlet, or one that discharges into a spot that floods. The last is backfilling with the same clay that came out of the hole, which holds water against the wall. A contractor who explains how they avoid each of these is one who has seen what happens when they're ignored.
On an existing home, ask the contractor how they'll protect the membrane during backfill, where the footing drain will discharge and how the final grade will slope. Those three answers tell you more about the quality of the job than the brand name on the membrane bucket.
How It Works
How a Foundation Waterproofing Call Works
Here's the sequence from the first call to backfill.
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Call Dispatch
Call +1-866-476-1348 and describe the foundation type, the moisture and your timeline.
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Rapid Mobile Arrival
A local independent contractor schedules a site visit, coordinating with your builder if the walls are still exposed.
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Expert Assessment & Quote
Expect a wall inspection, a system recommendation suited to the site and an itemized written quote.
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Resolution & Final Walkthrough
After application and drainage install, you'll get photos before backfill and a walkthrough of the warranty terms.
New construction tip: Request pre-backfill photos of the membrane and drainage layer for your records.
Seal Your Foundation the Right Way
Call now for a free referral to a licensed, insured independent foundation waterproofing contractor in Spokane.
Call +1-866-476-1348Customer Stories
Foundations Sealed for the Long Haul
Our builder planned on damp-proofing only. We upgraded to a membrane and drainage board, and the basement has stayed dry since day one.
Jordan P., Spokane
Three snap-tie holes leaked every storm. They were injected in an afternoon and haven't leaked since.
Mei L., Spokane
They excavated our worst wall, parged the block, applied a membrane and replaced the footing drain. The wall is dry now.
Carl B., Spokane
Fast scheduling and they texted photos of the membrane before backfilling. Very professional.
Ana V., Spokane
FAQ
Foundation Waterproofing Questions We Hear in Spokane
What's the difference between damp-proofing and waterproofing?
Damp-proofing is a thin asphalt coating that slows vapor but can't handle water pressure or bridge cracks. Waterproofing uses thicker, flexible membranes designed to stop liquid water under hydrostatic pressure.
Can an existing foundation be waterproofed from the outside?
Yes. The contractor excavates to the footing, cleans and repairs the wall, then applies a membrane, drainage board and footing drain before backfilling. It's more involved than interior work but stops water at the source.
How long does a foundation membrane last?
Quality membranes protected by drainage board are generally expected to last for decades. Ask the contractor for the manufacturer's rated lifespan and the written warranty terms.
Is foundation waterproofing worth it on new construction?
It's the cheapest moment to do it. The walls are already exposed, so you're paying for materials and labor, not excavation. Retrofitting later costs far more.
Can tie-rod leaks be fixed without digging?
Usually, yes. Tie-rod holes and small penetrations are often sealed from inside with injection. If many points leak, a broader solution may be more cost-effective.
Does foundation waterproofing require a permit?
It depends on your local building department and the scope. Excavation, drainage tie-ins and structural repairs are the most likely to need one, so ask the contractor who handles it.
Service Area
Foundation Waterproofing Coverage In and Around Spokane
We connect homeowners, builders and property owners throughout Spokane with independent foundation waterproofing contractors who work locally. That covers new construction, additions and existing homes.
Check the list below or call to ask about your area.
