Foundation, Crawlspace & Concrete Contractors in Monmouth, OR
Terrafirma in Monmouth, OR
At TerraFirma, we focus on preserving and improving the structural integrity of homes in Monmouth and throughout Oregon and Washington. For years, we’ve been dedicated to helping local homeowners tackle the unique climate and soil challenges of our area.
From a cracking foundation to a musty basement, a damp crawl space, or an uneven concrete slab, TerraFirma has the expertise and tools to restore your Monmouth home and ensure it stays safe for years to come.
Monmouth’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 Monmouth
Foundation issues can lead to significant damage to your home if not taken care of promptly. Signs like cracks in the floors, bowing walls, and sagging floors may indicate more serious structural concerns. Residents in Monmouth, OR might experience sticking doors, windows that don’t close correctly, or noticeable gaps between walls and ceilings. These issues can all point to shifting foundations due to soil movement, water damage, or simply the effects of aging.
At TerraFirma, we specialize in repairing foundations in Monmouth, offering expert solutions that address the specific causes of your foundation issues. Our process starts with a thorough inspection to identify the extent and source of the problem. From there, we recommend one or more of our trusted foundation repair systems tailored to your needs.
Foundation piers
In Monmouth, OR, our push and helical piers are expertly designed to stabilize and lift your foundation by shifting its load to deeper, more stable soil. Helical piers work wonders in areas with known soil conditions, while push piers are the perfect choice for locations where soil stability is uncertain. Both options are minimally invasive and provide permanent solutions for your 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 expert installation, ongoing maintenance options, and transferable warranties, ensuring you feel confident and at ease in your Monmouth home.
Basement Waterproofing Monmouth
Experiencing a wet basement in Monmouth, OR? It can lead to mold, mildew, structural damage, and poor air quality in your home. You might notice signs like musty odors, stained walls, pooling water, or a white, powdery substance known as efflorescence that appears when water evaporates. Even a small crack in your basement wall can turn into a significant entry point for moisture.
TerraFirma provides top-notch basement waterproofing solutions in Monmouth, ensuring your space stays dry, healthy, and functional in any weather.
Crawl Space Repair Monmouth
Crawl spaces in Monmouth, OR, are often forgotten, yet they play a vital role in your home’s structure and air quality. If neglected, these spaces can become a breeding ground for mold, pests, and standing water. This can result in wood rot, unpleasant odors, and even health problems for those living in your home.
We understand the unique crawl space conditions in Monmouth, OR. That’s why TerraFirma offers specialized repair services tailored to tackle moisture, mold, pests, and sagging floors through comprehensive encapsulation, effective drainage solutions, and sturdy 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 Monmouth 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 Monmouth
Cracked, damaged, or uneven concrete isn’t just an eyesore—it can also pose safety risks. These issues often arise from poor soil compaction, freeze-thaw cycles, erosion, or tree roots. That’s why homeowners in Monmouth trust us to swiftly and effectively restore their concrete slabs, sidewalks, patios, and driveways.
TerraFirma provides residents of Monmouth, OR with quick, neat, and durable concrete leveling and repair solutions, using cutting-edge polyurethane foam injection and crack sealing techniques.
PolyLevel® Concrete Lifting
PolyLevel utilizes expanding polyurethane foam to lift and stabilize concrete slabs in Monmouth, OR. 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 Monmouth, OR for industrial buildings, warehouse floors, roads, runways, and rail lines—using the same high-quality systems we trust for residential properties.
Earthquake Retrofitting Monmouth, OR
In Monmouth, OR, much of the Pacific Northwest sits within an active seismic zone. Homes built before the updated codes from the 1990s may be particularly at risk. Even a small earthquake can lead to your home shifting off its foundation or suffering significant structural damage.
TerraFirma’s earthquake retrofitting services help secure your Monmouth home to its foundation and strengthen its ability to withstand seismic events.
Retrofitting your home for earthquakes in Monmouth can help lower your insurance premiums and deductibles, plus you may qualify for coverage options that weren’t available before the upgrade.
How We Retrofit
Assessment & Planning
In Monmouth, OR, the retrofitting process starts with a thorough evaluation of your building’s condition. A qualified expert, like a structural engineer or a skilled technician, will assess your home to pinpoint any weaknesses and suggest the best solutions.
This evaluation involves checking the foundation, walls, roof, and overall structure of your property. Afterward, our engineer will create a detailed retrofitting plan tailored to the results.
Foundation Bolting
Securing the foundation is the next step for homes in Monmouth, OR. Our technicians install anchor bolts to connect your house to its foundation, keeping it stable and preventing any movement during an earthquake.
Our process starts with drilling holes into the foundation and installing sturdy steel bolts. Our team then tightens these bolts to reinforce the structure, improving its stability and making it more resilient against seismic activity.
Adding Shear Walls
Shear walls play a vital role in earthquake retrofitting by helping to distribute seismic forces, ensuring the safety and stability of your home in Monmouth.
Shear walls, made from plywood or other sturdy materials, are 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 here in Monmouth.
Bracing & Reinforcing
Next, we enhance the safety of your Monmouth home by adding steel braces and straps to key structural areas like the roof, walls, and floors. This important step improves your home’s stability, creating a sturdy framework that can better withstand seismic activity.
Securing Applicances
Ensuring your appliances are secured can help create a safer living environment for everyone in Monmouth, OR. It’s important to anchor items like water heaters and refrigerators. Our technicians will 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 Monmouth Home Today
At TerraFirma, we’ve spent over 25 years helping homeowners in Monmouth 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 Monmouth, OR is unique, but TerraFirma has a solution for every challenge you face. Reach out to us today for a free in-home estimate and find out how we can help make your home safer, healthier, and more valuable for years to come.
Monmouth
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.