Free Estimate
Financing
Commercial Solutions
Maintenance
Bill Pay
Foundation, Crawlspace & Concrete Contractors in Sammamish, WA
Terrafirma in Sammamish, WA
At TerraFirma, we’re dedicated to safeguarding and improving the structural integrity of homes in Sammamish and beyond. With years of experience, we’ve helped countless homeowners tackle the unique climate and soil challenges of our region.
From a cracking foundation to a musty basement, a damp crawl space, or an uneven concrete slab, TerraFirma has the expertise, tools, and reliable solutions to restore your Sammamish home and ensure its safety for years to come.
Sammamish’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 Sammamish
Foundation issues can lead to significant damage to your home if not taken care of. Signs like cracks in the floors, bowing walls, and sagging floors may indicate more serious structural problems. If you live in Sammamish, WA, you might notice doors that stick, windows that won’t close properly, or gaps appearing between your walls and ceilings. These are all potential indicators that your foundation is shifting due to soil movement, water damage, or natural aging.
At TerraFirma, we specialize in foundation repairs in Sammamish, offering expert solutions designed specifically for the unique challenges your foundation may face. Our process starts with a thorough inspection to identify the root cause and extent of the issue. From there, we recommend one or more of our trusted foundation repair systems tailored to your needs:
Foundation piers
Discover our push and helical piers designed to stabilize and elevate your foundation by shifting its load to deeper, more stable soil. In Sammamish, our helical piers are perfect for areas with known soil conditions, while our push piers excel in locations where soil stability may be uncertain. Both options are minimally invasive and provide lasting solutions for your home’s foundation needs.
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, ongoing maintenance options, and transferable warranties, ensuring you have confidence and peace of mind in your Sammamish home.
Basement Waterproofing Sammamish
Living in Sammamish, WA, means enjoying the beauty of nature, but a wet basement can create real headaches. It can lead to mold, mildew, structural damage, and even poor air quality in your home. You might notice signs of water intrusion like musty odors, stained walls, pooling water, or a white powdery residue known as efflorescence left behind as water evaporates. Remember, even a tiny crack in your basement wall can turn into a significant entry point for moisture.
TerraFirma provides top-notch basement waterproofing solutions in Sammamish, ensuring your home stays dry, healthy, and functional in any weather.
Crawl Space Repair Sammamish
Crawl spaces often get overlooked, but they’re essential for your home’s structure and air quality here in Sammamish. If left unattended, a neglected crawl space can become a breeding ground for mold, pests, and standing water. These issues can lead to wood rot, unpleasant odors, and even respiratory problems for you and your family.
We understand the unique crawl space challenges in Sammamish, WA, and TerraFirma’s repair services are tailored to tackle moisture, mold, pests, and sagging floors with complete encapsulation, effective drainage solutions, and robust 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 Sammamish 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 Sammamish
Damaged, cracked, or uneven concrete isn’t just an eyesore—it’s a safety risk. Issues like these can arise from factors such as poor soil compaction, freeze-thaw cycles, erosion, or tree roots. That’s why homeowners in Sammamish 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 services right here in Sammamish, WA, utilizing cutting-edge polyurethane foam injection and expert crack sealing techniques.
PolyLevel® Concrete Lifting
PolyLevel employs expanding polyurethane foam to lift and stabilize concrete slabs. This non-invasive method is perfect for residents of Sammamish, 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 Sammamish, WA for industrial buildings, warehouse floors, roads, runways, and rail lines—using the same high-quality systems we trust for residential properties.
Earthquake Retrofitting Sammamish, WA
Here in Sammamish, we live in an area of the Pacific Northwest that’s part of an active seismic zone. Homes built before the updated building codes of the 1990s may be particularly at risk. Even a minor earthquake can cause a home to shift off its foundation or sustain significant structural damage.
TerraFirma’s earthquake retrofitting services help secure your Sammamish home to its foundation and strengthen its ability to withstand seismic events.
By retrofitting your home for earthquakes in Sammamish, you can not only enhance its safety but also potentially reduce your insurance premiums and deductibles, plus qualify for coverage that might not have been available before the upgrade.
How We Retrofit
Assessment & Planning
In Sammamish, the retrofitting process starts with a thorough assessment of your home’s condition. A qualified expert, like a structural engineer or a trained technician, will inspect the property to pinpoint any weaknesses and suggest the best solutions to enhance its safety and performance.
Our evaluation covers the foundation, walls, roof, and overall structure of your home in Sammamish. Based on our findings, our engineer will create a detailed retrofitting plan tailored to your needs.
Foundation Bolting
Securing the foundation is the next step in our process here in Sammamish. Our technicians will install anchor bolts to connect your home to its foundation, ensuring it stays stable and secure during an earthquake.
This process involves drilling into the foundation and inserting steel bolts. Our team then tightens the bolts to secure the structure, improving its stability and helping it withstand seismic activity.
Adding Shear Walls
Shear walls play a vital role in earthquake retrofitting, helping to distribute seismic forces and keep your home safe from collapse.
Shear walls are usually made from strong materials like plywood, and they’re strategically installed in key areas of your home, especially in cripple walls. These walls offer extra support and stability, helping to minimize the risk of damage during an earthquake.
Bracing & Reinforcing
Next, we enhance the critical areas of your Sammamish home by adding steel braces and straps. Our skilled team installs these reinforcements to essential structural components like the roof, walls, and floors. This process boosts your home’s stability, creating a strong framework that can better handle seismic activity.
Securing Applicances
Ensuring your appliances are secure helps create a safer home for everyone in Sammamish, WA. It’s important to anchor items like water heaters and refrigerators. Our technicians can also install protective measures for gas meters to reduce 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 Sammamish Home Today
At TerraFirma, we’ve spent over 25 years helping homeowners in Sammamish 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 Sammamish, WA has its own unique qualities—but at TerraFirma, we have tailored solutions for every challenge. Reach out to us today for a free in-home estimate and find out how we can help enhance the safety, health, and value of your home for years to come.
Sammamish
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.
