Foundation, Crawlspace & Concrete Contractors in Sumner, WA
Terrafirma in Sumner, WA
At TerraFirma, we’re dedicated to safeguarding and strengthening the homes of Sumner, WA. With years of experience under our belts, we’ve helped local homeowners tackle the unique climate and soil challenges in our area, ensuring their homes remain safe and sturdy.
From a cracked foundation and musty basement to a damp crawl space or an uneven concrete slab, TerraFirma has the know-how, equipment, and reliable solutions to restore your Sumner home and ensure it stays safe for years to come.
Sumner’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 Sumner
Foundation problems can lead to significant damage to your home if not taken care of. If you’re in Sumner, WA, keep an eye out for signs like cracks in your floors, walls that seem to bow, or floors that sag. You might also notice doors that stick or windows that don’t close right, along with visible gaps between your walls and ceilings. These are often indications that your foundation is shifting, possibly due to soil movement, water damage, or the effects of aging.
At TerraFirma, we specialize in foundation repairs right here in Sumner. Our expert team provides targeted solutions designed to address the specific cause of your foundation issues. We start with a thorough inspection to evaluate the extent and source of the problem, and then we recommend one or more of our trusted foundation repair systems to ensure lasting results.
Foundation piers
Our push and helical piers are designed to stabilize and elevate your foundation by shifting its weight to deeper, more reliable soil. Helical piers work great for areas with known soil conditions, while push piers are the perfect choice for spots with uncertain stability. Both methods are minimally invasive and provide lasting solutions for your home in Sumner.
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, ongoing maintenance options, and transferable warranties, ensuring you have confidence and peace of mind in your home in Sumner.
Basement Waterproofing Sumner
Dealing with a damp basement in Sumner? It can lead to mold, mildew, structural issues, and the poor air quality of your home. You might notice signs like musty odors, stained walls, standing water, or efflorescence—the white, powdery residue that forms when water evaporates. Even a tiny crack in your basement wall can turn into a significant pathway for moisture. Don’t let these problems take root!
TerraFirma provides top-notch basement waterproofing solutions in Sumner, ensuring your space stays dry, healthy, and functional—come rain or shine.
Crawl Space Repair Sumner
Crawl spaces in Sumner, WA, are frequently overlooked, yet they play a vital role in your home’s structure and air quality. If neglected, these areas can become breeding grounds for mold, pests, and standing water. This can lead to problems like wood rot, unpleasant odors, and even respiratory issues for those living in the home.
We understand the unique crawl space conditions in Sumner, WA, and TerraFirma’s repair services are tailored to tackle moisture, mold, pests, and sagging floors with comprehensive 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 Sumner 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 Sumner
Damaged, cracked, or uneven concrete isn’t just an eyesore—it can also pose safety risks. Issues like poor soil compaction, freeze-thaw cycles, erosion, and tree root growth can lead to these problems. That’s why homeowners in Sumner turn to us for fast and effective solutions for their concrete slabs, sidewalks, patios, and driveways.
TerraFirma provides Sumner, WA, with speedy, clean, and durable concrete leveling and repair solutions, utilizing advanced polyurethane foam injection and crack sealing techniques.
PolyLevel® Concrete Lifting
PolyLevel employs expanding polyurethane foam to lift and stabilize concrete slabs right here in Sumner, WA. This non-invasive method is perfect 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 Sumner, WA for industrial buildings, warehouse floors, roads, runways, and rail lines—using the same high-quality systems we trust for residential properties.
Earthquake Retrofitting Sumner, WA
Sumner, WA, is located in a seismically active region of the Pacific Northwest. Homes built before the updated building codes from the 1990s may be particularly at risk. Even a small earthquake can lead to significant issues, such as shifting off their foundations or sustaining serious structural damage.
TerraFirma’s earthquake retrofitting services help secure your Sumner home to its foundation and strengthen its ability to withstand seismic events.
Retrofitting your home for earthquakes in Sumner can help lower your insurance premiums and deductibles, and may even make you eligible for coverage options that weren’t available before the upgrade.
How We Retrofit
Assessment & Planning
In Sumner, WA, the retrofitting process starts with a thorough assessment of your building’s current condition. A skilled professional, like a structural engineer or trained technician, will evaluate your home to pinpoint any weaknesses and suggest the best solutions.
This evaluation involves a thorough inspection of the foundation, walls, roof, and overall structure. After that, the engineer will create a detailed retrofitting plan tailored to the findings.
Foundation Bolting
Securing the foundation is an essential next step in our process here in Sumner. Our skilled technicians install anchor bolts to firmly connect your home to its foundation, helping to prevent any lateral movement during an earthquake.
Our process includes drilling into the foundation and inserting sturdy steel bolts. Our team then tightens these bolts to secure the structure, boosting its stability and improving its ability to withstand seismic activity.
Adding Shear Walls
In Sumner, WA, shear walls play a crucial role in earthquake retrofitting by helping to distribute seismic forces and keep buildings safe from collapsing.
Shear walls, often made of plywood or other sturdy materials, are installed in key areas of homes in Sumner, especially within cripple walls. These walls enhance the support and stability of your home, helping to minimize the risk of damage during an earthquake.
Bracing & Reinforcing
Next, we strengthen key areas of your Sumner home by adding steel braces and straps. Our team installs these reinforcements to essential structural components like the roof, walls, and floors. This process enhances your home’s stability, providing a robust framework designed to withstand seismic forces.
Securing Applicances
Securing your appliances is key to ensuring a safer home in Sumner. Anchoring items like water heaters and refrigerators is essential, and our technicians will also install safeguards for gas meters 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 Sumner Home Today
At TerraFirma, we’ve spent over 25 years helping homeowners in Sumner 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 Sumner, WA has its own unique charm—but TerraFirma is here to tackle any challenge you might face. Reach out today for a free in-home estimate, and see how we can help enhance the safety, health, and value of your home for years to come.
Sumner
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.