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Foundation, Crawlspace & Concrete Contractors in Seattle, WA
Terrafirma in Seattle, WA
At TerraFirma, we’re dedicated to safeguarding and strengthening the structural integrity of homes throughout Washington, including right here in Seattle. For years, we’ve been helping homeowners navigate the unique climate and soil challenges of our region with reliable repair solutions.
From a settling foundation and musty basements to damp crawl spaces and uneven concrete slabs, TerraFirma has the expertise, equipment, and reliable solutions to restore your Seattle home and ensure it stays safe for years to come.
Seattle’s TOP-RATED Foundation & Basement Contractors
Contact us at (866) 486-7196 or use the form to the right.
Hours: Monday – Friday, 8am-5pm
Foundation Repair Seattle
Foundation issues can lead to significant damage to your home if not taken care of. In Seattle, WA, homeowners may notice signs like cracked floors, bowing walls, and sagging floors that often indicate more serious structural problems. You might find that doors are sticking, windows aren’t closing properly, or gaps are appearing between walls and ceilings. These could all be signs that your foundation is shifting due to soil movement, water damage, or the wear and tear of age.
At TerraFirma, we specialize in foundation repair right here in Seattle, offering expert solutions designed to address the specific issues affecting your foundation. Our process starts with a thorough inspection to identify the root cause and severity of the problem. Following that, we’ll recommend one or more of our trusted foundation repair systems:
Foundation piers
Our push and helical piers are designed to stabilize and lift your foundation by transferring its load to deeper, more stable soil. In Seattle, where soil conditions can vary, helical piers are perfect for known challenges, while push piers are ideal for areas with unpredictable stability. Both options are minimally invasive and provide long-lasting solutions for your home.
Wall Stabilization Systems
For cracked, bowing, or leaning walls, we offer a suite of reinforcement products. These include:
- CarbonArmor®: Made from fiber-reinforced polymers ten times stronger than steel.
- PowerBrace®: Zinc-plated steel beams that can be tightened over time.
- GeoLock® Anchors and Helical Tiebacks: These systems halt inward movement and gradually straighten walls over time.
- EverBrace™: Designed for severely deteriorated walls, this system replaces and reinforces failing foundation walls with steel supports.
We also offer grouted micropile tiebacks for difficult soil conditions, SmartJack® crawl space support posts for sagging floors, and vapor barriers to manage humidity and prevent further moisture damage.
Every solution comes with expert installation, maintenance options, and transferable warranties, ensuring you feel confident and at ease in your Seattle home.
Basement Waterproofing Seattle
Living in Seattle, a wet basement can create a host of problems, including mold, mildew, structural issues, and poor air quality in your home. Signs of water intrusion can include musty odors, stained walls, pooling water, or efflorescence—a white, powdery residue that appears when water evaporates. Even the smallest crack in your basement wall can turn into a significant source of moisture.
TerraFirma provides top-notch basement waterproofing solutions in Seattle, ensuring your space stays dry, healthy, and functional regardless of the weather.
Crawl Space Repair Seattle
Crawl spaces are often forgotten, but they play a vital role in your home’s structure and air quality here in Seattle. If left unattended, a neglected crawl space can become a breeding ground for mold, pests, and standing water. These issues can result in wood rot, unpleasant odors, and even respiratory problems for those living in your home.
“We understand the unique crawl space challenges in Seattle, WA. That’s why TerraFirma offers specialized crawl space repair services to tackle moisture, mold, pests, and sagging floors with solutions like full encapsulation, drainage, and structural support.”
Encapsulation & Drainage
We begin by sealing the crawl space with our VaporLoc Elite liner, a 120-mil thick waterproof barrier that blocks moisture, soil gases, and allergens. To ensure proper drainage:
- We use drainage matting under the liner to guide water to your perimeter drain or sump pump.
- Sump pumps remove water quickly and efficiently, even during heavy rain or high water table conditions.
Crawl Space Entry & Vent Solutions
- EverLast™ Doors & Access Wells: Waterproof, durable entry systems that keep out pests and moisture.
- Turtl™ Access Well: An attractive, lockable access solution in several colors.
- Vent Covers: Sealing crawl space vents prevent outdoor air, moisture, and insects from entering.
Crawlspace repair in Seattle is crucial to maintaining your home’s overall health and energy efficiency.
Structural Repairs
To support sagging or weak floor joists, our SmartJack® Support Posts offer adjustable, galvanized steel columns that restore floor stability. These are fast to install and offer permanent results.
Dehumidifiers & Monitoring
Install a SaniDry Sedona dehumidifier to maintain healthy humidity levels year-round. For added security, our ShipShape™ System offers 24/7 performance monitoring, proactive maintenance alerts, and remote control of your crawl space systems.
Concrete Repair Seattle
Damaged, cracked, or uneven concrete isn’t just an eyesore—it can also pose a safety risk. Issues like poor soil compaction, freeze-thaw cycles, erosion, and tree root growth can lead to these problems. Homeowners in Seattle turn to us for quick and effective repairs on their concrete slabs, sidewalks, patios, and driveways.
TerraFirma provides quick, efficient, and durable concrete leveling and repair solutions in Seattle using state-of-the-art polyurethane foam injection and crack sealing techniques.
PolyLevel® Concrete Lifting
PolyLevel utilizes expanding polyurethane foam to lift and stabilize concrete slabs. This non-invasive method is perfect for the Seattle area, ideal for:
- Sidewalks – Eliminates tripping hazards and restores smooth walkways.
- Driveways – Prevents further cracking and improves curb appeal.
- Patios, Porches, and Pool Decks – Ensures proper drainage and surface stability.
NexusPro™ Crack & Joint Sealant
To prevent water intrusion that can lead to further sinking, we apply NexusPro, a UV-resistant silicone-based joint sealant that:
- Cures in just 60 minutes.
- Withstands extreme weather and heavy use.
- Includes color-matched sand for a clean, polished look.
SealantPro™ Concrete Protection
After sealing and lifting your concrete, SealantPro provides a long-term barrier against moisture, chemicals, and seasonal temperature changes. It penetrates deep into concrete to resist stains, flaking, and surface erosion.
We also provide commercial concrete repair in Seattle, WA for industrial buildings, warehouse floors, roads, runways, and rail lines—using the same high-quality systems we trust for residential properties.
Earthquake Retrofitting Seattle, WA
Much of the Pacific Northwest, including Seattle, sits in an active seismic zone. Homes built before the updated building codes of the 1990s may be particularly susceptible. Even a small earthquake can cause a house to shift off its foundation or sustain significant structural damage.
TerraFirma’s earthquake retrofitting services help secure your Seattle home to its foundation and strengthen its ability to withstand seismic events.
Earthquake retrofitting in Seattle not only strengthens your home, but it can also lower your insurance premiums and deductibles, plus make you eligible for coverage that wasn’t available before the upgrade.
How We Retrofit
Assessment & Planning
The retrofitting process starts with a thorough evaluation of your building’s current state. A qualified professional, like a structural engineer or experienced technician, will assess your home to pinpoint any weaknesses and suggest the best solutions tailored for Seattle’s unique environment.
This assessment covers an in-depth inspection of the foundation, walls, roof, and overall structure. Afterward, our engineer creates a thorough retrofitting plan tailored to the findings.
Foundation Bolting
Securing the foundation is the next crucial step in the process here in Seattle. Our technicians install anchor bolts to firmly connect your home to its foundation, ensuring stability and protection against lateral movement during an earthquake.
Our process includes carefully drilling into the foundation and installing steel bolts. The crew then secures these bolts, boosting the structure’s stability and improving its resistance to seismic activity, which is especially important here in Seattle.
Adding Shear Walls
Shear walls play a vital role in earthquake retrofitting in Seattle, helping to distribute seismic forces and keeping buildings safe from collapse.
Shear walls, usually made from plywood or other durable materials, are installed in key areas of your home, especially in cripple walls. These walls enhance support and stability, significantly lowering the risk of damage during an earthquake, which is vital for Seattle residents.
Bracing & Reinforcing
Next, we enhance key areas of your home in Seattle by installing steel braces and straps. Our team secures these to essential structural elements like the roof, walls, and floors. This crucial step boosts your home’s overall stability, ensuring it has a robust framework to withstand seismic activity.
Securing Applicances
Securing your appliances helps create a safer living space for everyone in Seattle. It’s essential to anchor items like water heaters and refrigerators. Our technicians can also install protective measures for gas meters to minimize the risk of gas leaks.
Reparing Foundations
During retrofitting, technicians may notice substantial foundation damage that needs immediate repair. Adding crawl space support posts and foundation piers, and stabilizing the walls are some of the ways TerraFirma can reinforce your foundation.
Secure Your Seattle Home Today
At TerraFirma, we’ve spent over 25 years helping homeowners in Seattle and across the Pacific Northwest protect their homes from the ground up. From foundation repair and basement waterproofing to crawl space encapsulation, concrete leveling, and earthquake retrofitting, our team delivers top-tier craftsmanship with trusted products, proven systems, and lasting warranties.
Every home in Seattle, WA is unique—but TerraFirma has the perfect solution for every challenge. Reach out to us today for a complimentary in-home estimate and find out how we can help make your home safer, healthier, and more valuable for years to come.
Seattle
Homeowners Frequently Asked Questions
How does rain put my home at risk ?
SeaTac soils are impacted by heavy rains causing hydrostatic pressure. This leads to cracks in foundations and basements and may cause your foundation to settle or sink. Engineered support structures and comprehensive drainage systems are key to keeping your home dry, safe, and stable.
What’s the best way to repair concrete?
The NexusPro solution is a commercial grade joint sealant that offers several advantages over traditional concrete crack repairs. Its fast cure time (60 minutes) and performance under extreme temperatures makes it a perfect match for concrete repairs.
What types of cracks in my foundation or basement should I be concerned with?
Houses are susceptible to cracks in basements due to heavy rains and wet soils. Watch out for horizontal or stair step cracking along the foundation wall, diagonal cracks in the corners, crumbling walls and inward bulges.
How to fix a leaking basement floor?
If you have water coming through the floor or windows to your basement, the first step is installing a perimeter drain system. We can also install a direct drainage channel, which will help direct any water that comes through the crack into the drain and your sump pump.
Are you noticing damp drywall and carpet in your basement?
Musty smells, walls that feel damp to the touch, and ground-level leaks are all indicators that your basement may need to be waterproofed. Don’t wait until the next heavy rain to protect your home from water damage.
Which vapor barrier is best for weeping walls?
The VaporLoc Elite Wall System is better for weeping walls than other commonly used vapor barriers. The VLE system has double sealed seams, waterproof material (not water-resistant), and is much thicker than vapor barriers available at retail stores.
Can I turn my crawl space into storage?
TerraFirma offers comprehensive encapsulation solutions to keep your crawl space clean, dry, and secure from outside threats. Our industry-leading vapor barrier system keeps out destructive moisture while greatly improving your indoor air quality. In most homes, TerraFirma can even encapsulate your crawl space, giving you a clean, dry area suitable for storage.
How to repair damaged concrete?
While you could seal concrete with urethane caulk found at your local big-box DIY store, that is a solution that is prone to cracking, bubbling and drying out over time. The local experts at TerraFirma are here to help with long lasting solutions to level seal your unprotected joints and cracked concrete.
What is that bad smell coming up from my drain?
Unwanted air and gasses are coming up through your home’s drain system. A great fix is our TrenchLock™ drain insert that can be installed in an existing trench drain to allow water down without allowing air to come up. The system comes with balls that fit over the drainage holes, which create an airtight seal when there is no water.
What is the difference between helical piers and push piers?
Helical piers and push piers are both types of foundation repair methods, but they differ in their design and installation process. The choice between helical piers and push piers depends on factors such as soil conditions and structural requirements. Helical piers are often preferred in areas with weak or unstable soil conditions.
How long does basement waterproofing last?
TerraFirma-installed waterproofing systems are expected to last decades with regular care & maintenance. We also warranty our installations, our WaterGuard and DryTrak drainage systems come with a transferrable lifetime warranty. Terms apply, view the details here. We stand by our work and the quality of the systems we install.
