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Foundation, Crawlspace & Concrete Contractors in SeaTac, WA
Terrafirma in SeaTac, WA
At TerraFirma, we’re dedicated to strengthening and safeguarding homes in SeaTac and the surrounding areas. With years of experience, we’ve helped countless homeowners tackle the unique climate and soil challenges that come with living in this beautiful part of Washington.
From a cracked foundation and a musty basement to a damp crawl space and an uneven concrete slab, TerraFirma has the knowledge, tools, and reliable solutions to restore your SeaTac home and ensure it’s safe for years to come.
SeaTac’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 SeaTac
Foundation problems can lead to serious damage to your home if not taken care of. In SeaTac, WA, homeowners might notice signs like cracks in the floor, bowing walls, or sagging floors, which could indicate more significant structural issues. You may also find that doors are sticking, windows don’t close properly, or gaps are appearing between the walls and ceilings. These issues often point to a shifting foundation caused by soil movement, water damage, or the natural wear and tear that comes with age.
At TerraFirma, we specialize in foundation repairs in SeaTac, offering expert solutions designed to address the specific causes of your foundation issues. Our process starts with a thorough inspection to evaluate the extent and source of the problem. From there, we provide recommendations for one or more of our effective 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. Helical piers work great in areas with known soil conditions, while push piers are the best choice for spots where soil stability is uncertain. Both systems are minimally invasive and provide long-lasting solutions for properties in SeaTac, WA.
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 professional installation, flexible maintenance options, and transferable warranties, so you can enjoy confidence and peace of mind in your SeaTac home.
Basement Waterproofing SeaTac
Don’t let a damp basement put your SeaTac home at risk. The presence of moisture can lead to issues like mold, mildew, structural damage, and poor air quality. You might notice signs of water intrusion through musty odors, stained walls, pooling water, or efflorescence—a powdery residue left when water evaporates. Even a tiny crack in your basement wall can open the door to bigger moisture problems.
TerraFirma provides top-notch basement waterproofing solutions in SeaTac to ensure your space stays dry, healthy, and functional, rain or shine.
Crawl Space Repair SeaTac
Crawl spaces may not be top of mind, but they’re essential to your home’s structure and air quality right here in SeaTac. If ignored, 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 the home.
We understand the unique crawl space conditions in SeaTac, WA, and TerraFirma’s crawl space repair services are here to tackle moisture, mold, pests, and sagging floors with our complete encapsulation, drainage solutions, 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 SeaTac 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 SeaTac
Cracked, damaged, or uneven concrete isn’t just an eyesore—it poses a safety risk too. Issues like poor soil compaction, freeze-thaw cycles, erosion, or tree roots can lead to these problems. Residents of SeaTac trust us to swiftly and effectively repair their concrete slabs, sidewalks, patios, and driveways.
TerraFirma provides quick, clean, and durable concrete leveling and repair solutions in SeaTac, WA, utilizing innovative polyurethane foam injection and effective crack sealing techniques.
PolyLevel® Concrete Lifting
PolyLevel uses expanding polyurethane foam to lift and stabilize concrete slabs. This non-invasive method is perfect for residents of SeaTac, WA, looking to:
- 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 SeaTac, WA for industrial buildings, warehouse floors, roads, runways, and rail lines—using the same high-quality systems we trust for residential properties.
Earthquake Retrofitting SeaTac, WA
Here in SeaTac, WA, we’re located in an active seismic zone that’s part of the Pacific Northwest. Homes built before the updated building codes of the 1990s are particularly at risk. Even minor earthquakes can cause a home to shift off its foundation or suffer significant structural damage.
TerraFirma’s earthquake retrofitting services help secure your SeaTac home to its foundation and strengthen its ability to withstand seismic events.
Upgrading your home with earthquake retrofitting in SeaTac can help lower your insurance premiums and deductibles, and even give you access to coverage options that weren’t available before.
How We Retrofit
Assessment & Planning
Getting started with retrofitting in SeaTac means a thorough assessment of your building’s current condition. Our specialists, including structural engineers and trained technicians, will inspect your home to pinpoint any weaknesses and suggest the best solutions.
This assessment will take a close look at the foundation, walls, roof, and overall structure of your building. Afterward, our engineer will create a detailed retrofitting plan tailored to the findings.
Foundation Bolting
Securing the foundation is the next crucial step in your home project. Our technicians install anchor bolts to firmly connect your house to its foundation, ensuring it stays stable during any seismic activity.
In SeaTac, we enhance the stability of your foundation by drilling holes and installing steel bolts. Our team then tightens the bolts to secure the structure, providing it with increased resistance to seismic forces.
Adding Shear Walls
Shear walls play a vital role in earthquake retrofitting, helping to distribute seismic forces and ensuring that buildings in SeaTac stay standing during a quake.
Shear walls are usually made from durable materials like plywood and are strategically installed throughout your home, especially in areas known as cripple walls. They enhance the stability and support of the walls, helping to lower the risk of damage during an earthquake.
Bracing & Reinforcing
Next, we focus on strengthening vital areas of your home in SeaTac with durable steel braces and straps. Our team installs these to essential structural components like the roof, walls, and floors. This crucial step enhances your home’s stability, providing a robust framework designed to withstand seismic activity.
Securing Applicances
Ensuring your appliances are securely anchored creates a safer living environment in SeaTac. It’s important to stabilize items like water heaters and refrigerators. Our technicians also provide gas meter protection to help prevent 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 SeaTac Home Today
At TerraFirma, we’ve spent over 25 years helping homeowners in SeaTac 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 SeaTac, WA has its own unique character, but TerraFirma has the perfect solution for every challenge you may face. Reach out to us today for a complimentary in-home estimate and find out how we can help enhance the safety, health, and value of your home for years to come.
SeaTac
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.
