Foundation Waterproofing in Shoreline

Guarding Your Foundation Against North King Rainfall

Basement Expert 5-star reviews, same-day response, and NDS-certified drainage specialists

Drainage Systems and Active Water Redirection

Certified Installers for Footing Drains

Real Customer Reviews:

    
 
 
       Posted on Google  
   
   Anne Erickson 
 
 
 
 Trustindex verifies that the original source of the review is Google. We used them to help with a rock well for our sump pump and they were quick, affordable, very communicative, and professional! I would use them again in the future if I needed them!
  
 
      Posted on Google  
   
   Carr Onstott 
 
 
 
 Trustindex verifies that the original source of the review is Google. Just had a set of french drains and new downspout drains installed and we couldn't be happier with the work. The owner was very responsive and helpful. We called on a Thursday afternoon after seeing some water in our basement and he came right out that evening and got started the very next morning. They did an excellent job cleaning up after themselves every day and even helped me out with a few minor touch ups. Would absolutely recommend them to anyone else needing some work done.
  
 
      Posted on Google  
   
   Tanya Nadkarni 
 
 
 
 Trustindex verifies that the original source of the review is Google. They were very responsive and came by and provided a reasonable estimate quickly. They waterproofed my basement (had a mold issue which prompted me to reach out to them) and I haven’t had any issues so far. Worked fast and explained clearly what needed to be done.
  
 
      Posted on Google  
   
   Kyle Karpack 
 
 
 
 Trustindex verifies that the original source of the review is Google. Vlad and the Basement Expert team did a fantastic job installing a complete perimeter drain and waterproofing system in our unfinished basement. We appreciated that they were timely, clean, clear communicators, and most of all, that they did excellent work. Our project was challenging, but they were ready to tackle everything that came up including plumbing changes and having to trench around a large boulder, without any unexpected costs on our side.

From the start, Vlad’s evaluation of our project was honest and thorough, and they were transparent with pricing and the scope of work. The pricing was competitive and we felt that their team went above and beyond with their excellent workmanship and attention to detail. Throughout the project, they explained what they were doing and consistently made great decisions. For anyone needing a sump pump, french drain, or other basement waterproofing services, I’d recommend Basement Expert without any hesitation!
  
 
      Posted on Google  
   
   Eva Papp 
 
 
 
 Trustindex verifies that the original source of the review is Google. Vlad of Basement Expert Waterproofing recently diagnosed my basement leak issue. He came with scopes and moisture readers, and was able to not only verify the condition of work I had done previously with another company, but suggest what a reasonable fix would be. He came out the day after I called, and while we had planned to do the job the following week, he was able to complete the job the same day when space opened up in his schedule. I can’t believe it. In the midst of rainy season I got a same day fix with a new rock well and diversion system. These guys are honest, professional, timely, and cost effective. Total pleasure working with them, and they will for sure be the first ones I call if ever I need this type of service again. Thanks Vlad and crew.
  
 
      Posted on Google  
   
   Daniel Gus Schreiner 
 
 
 
 Trustindex verifies that the original source of the review is Google. We highly recommend Basement Expert. Being new to the area we talked with a lot of companies about waterproofing and other house projects and we were initially impressed with Basement expert's clear communication and they didn't seem like they were trying to sell us something we didn't need.

After hiring them, the clear communication continued and we found them to have integrity and take pride in their work. They were also very clear and fair about pricing and definitely earned our trust. We can now rest easy when there is heavy rain knowing that their work is protecting our home and the money we have put into our other improvements!
  
 
      Posted on Google  
   
   Sam Wu 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very responsive and professional! They came out and fixed my foundation crack the very next day after giving a competitive price.
  
 
      Posted on Google  
   
   Ryan Johnson 
 
 
 
 Trustindex verifies that the original source of the review is Google. They are knowledgeable, showed up consistently, and provided updates when unexpected obstacles came along. We have a tricky foundation at the base of a wet hill with poor access and they built complete foundation and runoff drain systems in less than 2 weeks.
  
 
      Posted on Google  
   
   Jordan 
 
 
 
 Trustindex verifies that the original source of the review is Google. I had them add French drains and a channel drain to our basement because water was getting in from the garage and the walls. They did a great job covering the old catch basin in the driveway, adding French drains, and tying our gutter into the new channel drain line. Excellent work, great communication through the entire process, and real integrity. After it was finished, I noticed that the garage door wasn't closing because they had raised the level of concrete. Serhii was out first thing on Monday to fix it, and while he was here he noticed that some of the extra strong concrete they installed in the garage entryway wasn't drying like it was supposed because it's the rainy season. So he had Anatole come out the same day to remove it and install more quick drying concrete. That kind of service and response time is hard to find with contractors.

The only thing I wish that was slightly different about the install is that the dimple board (moisture catching fabric on the walls) came out a bit wavy which will make it look pretty bad if we want to paint over it. So we'll probably put up drywall in the basement to cover it, but sadly that will reduce the amount of usable space. I'm not sure if that issue is even something that other contractors could avoid. And in all other respects, they did a fantastic job and we're very pleased. Hasn't been a big rain to test out the new system, but it sure looks solid. Would happily recommend.
  
 
      Posted on Google  
   
   Byron Kwan 
 
 
 
 Trustindex verifies that the original source of the review is Google. We called Basement Expert to come out and take a look at an overflowing gutter drain pipe that was causing water to pool near our foundation during heavy rain. They were very responsive and professional and Vlad and his team were able to come out the next day. When they arrived, they scoped our underground drain pipe and found no issue, but they did note that the gutter itself was not installed correctly and that the adapter from downspout to drain pipe needed replacing. They went to grab supplies and came back right away to fix it. They also didn't charge us for the work because it was a small fix! I was super impressed with their work ethic, attention to detail, and willingness to help us for free. I would recommend anyone to give them a call if you think they could help you out!
  
 
  
  
 
 
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How We Install Membranes and Exterior Drains

When groundwater presses against your footing, foundation waterproofing in Shoreline starts with a moisture map—not a one-size template. Basement Expert traces where runoff, clay bluffs, or failed perimeter drains overload your walls, then scopes exterior membrane and footing-drain work for North King properties. Call 206-388-7867 to book a free inspection from Lynnwood.

The work usually follows the same order: confirm the water source, open the wall from outside where access allows, then add membrane, drain and outlet as one system. Interior drainage is the fallback when decks, additions or property lines block digging. Any waterproofing company should be able to explain where your water will end up.

Foundation drainage and waterproofing work by Basement Expert

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Identifying Early Signs of Structural Moisture

Properties along Richmond Beach and Echo Lake corridors often sit on dense till and bluff deposits. Seasonal rains saturate these soils quickly, building hydrostatic pressure against footing walls. We size membrane and drain layouts for these North King soil types instead of importing a generic wet-basement playbook.

Watch for these before they turn into repairs:

White, powdery efflorescence on block or concrete.
Damp carpet or tack strip along the outer wall.
Horizontal cracks, which point to soil pressure.
Water marks after storms on the uphill side.

Bluff-area lots also see runoff from streets and neighbors above, so we check where surface water enters the yard as well as the ground below it.

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Available Repair Methods for Wet Foundations

Each method below handles a different problem. Many homes need two of them working together, such as a drain plus crack sealing.

Excavation trench for exterior footing drain installation

Carbon Fiber Reinforcement for Wall Cracks

Horizontal cracks and bowing mean the soil is pushing the wall in. Carbon fiber straps epoxied to the wall resist that load without excavation. More detail is on our carbon fiber reinforcement page.

Paintable and close to flush with the wall.
Installed from the basement side.
Helps stop cracks from reopening.

Injection for Leaking Cracks

For stable walls, injection seals cracks through their full depth. We use epoxy where the crack needs to carry load again, and flexible polyurethane where seasonal movement would break a rigid repair.

Foundation wall condition before waterproofing repair

Completed foundation drainage and membrane installation

Coatings for Light Dampness

Masonry sealers and coatings are a reasonable choice when the problem is humidity or slight dampness, especially before finishing a room. They are not designed to resist water under pressure from saturated till, so we don’t sell them as a cure for leaks.

Exterior Membrane and Footing Drain

Our preferred fix on accessible walls is to dig to the footing, clean and repair the wall, apply a waterproof membrane with drainage board, and lay a perforated French drain in washed rock beside the footing. Water then flows to a daylight outlet, dry well or sump instead of the wall.

Where excavation is not possible, the same drain goes in under the slab inside, paired with a wall membrane and sump.

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Our Standard Process for Complete Foundation Protection

Inspection, water-source mapping and a written scope.
Locate utilities and protect landscaping and floors.
Excavate or saw-cut to the footing.
Repair cracks and install membrane and drainage board.
Lay drain pipe and connect the outlet or sump.
Backfill or restore concrete, then a final walkthrough.

To get on the schedule, call 206-388-7867.

Why We Are Chosen for Our Local Properties

Family-Owned and Close By

Basement Expert (Artbrick LLC) is a family-owned team based in Lynnwood, a short drive north. Homeowners deal directly with the crew, get honest recommendations, and never face high-pressure upselling.

Trained in NDS Drainage Methods

Our layouts follow NDS drainage practice: estimate the water, choose the path, then size the pipe and outlet.

HEPA Dust Control

When we work inside, we contain the area and run HEPA air scrubbers so dust stays out of the rest of your home.

Working With Builders

For new homes and additions we schedule membrane, footing drain and sump work around the framing and backfill timeline. We install interior systems, exterior basement waterproofing, French drains and sump pumps.

Repairs on Existing Homes

For homes already showing damage, our foundation repair services include:

Replacing moisture-damaged wood.
Sealing exterior cracks.
Correcting settlement or shifting.
Diagnosing shrinkage cracks before repair.

Seeing any of these signs? Call (206) 388-7867 to book a footing-level inspection.

How Is a Project Priced?

Small repairs, such as structural epoxy injection, typically run $600 to $4,000 per crack, while comprehensive exterior waterproofing systems for an entire perimeter typically range between $15,000 and $20,000 depending on excavation depth and accessibility. Steep yards, retaining walls and tight side setbacks can add to excavation cost.