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Radon Mitigation
Radon Testing
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Radon Mitigation System

Basement Repair Services & Products
WaterGuard Interior System
DryTrak Drainage Channel
TrenchDrain Drain Grate
IceGuard Discharge Line
FlexiSpan Wall Crack Repair
Polyurethane Crack Sealing
WellDuct Window Drainage
BrightWall Waterproof Panels
ThermalDry Wall Barrier
Basement To Beautiful Pre-finishing Wall Insulation Panels
Drain Tile Installation
SuperSump Pump System
TripleSafe Pumping System
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Sanidry Dehumidifier

Crawl Space Repair Services & Products
CleanSpace Encapsulation Vapor Barriers And Liners
Turtl Access Hatch
EverLast Crawl Space Doors
Sanidry Csb Dehumidifier
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SilverGlo Wall Insulation
TerraBlock Floor Insulation
SmartSump Sump Pump
Crawl-o-Sphere Crawl Space Fan
WallCap Block Wall Sealer
SmartVent Flood Vents

Foundation Repair Services & Products
Push Pier Underpinning For Settlement, Foundation Leveling, Sinking Foundation Repair
Geo-lock Wall Anchors
Geo-lock Helical Anchors
PowerBrace Bowed Wall Repair
CarbonArmor Fiber Wall Repair
SmartJack Crawl Space Support
Slab Pier Repair
PolyLevel Concrete Lifting
EZ Post Deck Repair
Shotcrete Wall Restoration

Before and After Pictures from King County
Crawl Space Encapsulation in Issaquah, WA
Crawl Space Encapsulation in Issaquah, WA
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Crawl Space Encapsulation in Issaquah, WA

Before After
Crawl Space Encapsulation in Issaquah, WA Crawl Space Encapsulation in Issaquah, WA

After years of neglect and water damage, this crawl space in Issaquah, WA hadn't seen a good day in a long time. From the rust on the nails in the wall to the mildew-infested insulation, the water damage in this crawl space was instantly noticeable from anyone who stepped inside.

Once the homeowners noticed that a "mildewy smell" in the first floor of their home was coming from the crawl space, they did the right thing and set up a free estimate with TerraFirma. Our experienced System Design Specialist Drew Fry assessed the problem, and he concluded that to mitigate future water damage, the crawl space would need a TripleSafe Sump Pump to properly drain water away from home. We also recommended that we install drainage matting to prevent water from seeping through and pooling in the crawl space, as well as VaporLoc to prevent moisture intrusion.

With a plan put in place, the TerraFirma team mitigated water damage and encapsulated the crawl space in three days! 

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Company Awards
Elite Service Professional Award
Elite Service Professional Award
By receiving no homeowner complaints and having more than five five star ratings on our profile, TerraFirma was awarded the... [Read more]
Home Advisor Top Rated Company
Home Advisor Top Rated Company
TerraFirma earned the "Top Rated" award from Home Advisor, a home improvement website that millions of homeowners trust to help... [Read more]
Inc. Fastest-Growing Private Companies in America
Inc. Fastest-Growing Private Companies in America
TerraFirma Foundation Systems ranked 1,1718 out of 5,000 companies on Inc. Magazine's Fastest Growing Private Companies in America. In Oregon,... [Read more]
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TerraFirma serving King County, WA

Happy Customers Surrounding King County, WA
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Experts in Basement Waterproofing in King County, WA

TerraFirma is your local expert contractor for all your basement waterproofing needs in King County, WA. Having a wet, water damaged basement can cause numerous problems in your home including foundation problems and mold. In addition to our basement waterproofing services, we also offer services such as crawl space repair and sump pumps. 

Since 1995, TerraFirma has been the contractor that Washington can trust to get the job done right the first time. Our team of trained experts use only high quality materials from the best manufacturers in the business so that you can be assured that the products we install in your home will be reliable and long lasting. We want to work with you to find a solution that will best fit both your home and your budget!

Services Provided by TerraFirma in King County, WA 

  • Basement waterproofing
  • Crawl space repair
  • Sump pumps

If you want to get started on your home's basement waterproofing project, call TerraFirma in King County, WA for a free estimate today!

News & Events From from King County
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Have you ever considered what's in the air you breathe in your home? While it's weird to think about, but for homeowners in the Pacific Northwest, it should be top of mind.... [Read more]
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Another reason why you should retrofit your home for an earthquake in Oregon
A 6.2 magnitude earthquake hit the Oregon Coast early Wednesday morning. The quake was less than 200 miles from the Cascadia fault line.... [Read more]
More News & Events
Work Requests From King County, WA
in King
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Serving the following King County, WA zip codes
Seattle 98106, Seattle 98155, Seattle 98139, Seattle 98127, Seattle 98194, Seattle 98118, Seattle 98177, Seattle 98111, Seattle 98164, Seattle 98103, Seattle 98146, Seattle 98134, Seattle 98124, Seattle 98188, Seattle 98115, Seattle 98170, Seattle 98107, Seattle 98158, Seattle 98141, Seattle 98129, Seattle 98195, Seattle 98119, Seattle 98178, Seattle 98112, Seattle 98165, Seattle 98104, Seattle 98148, Seattle 98136, Seattle 98125, Seattle 98190, Seattle 98116, Seattle 98174, Seattle 98108, Seattle 98160, Seattle 98101, Seattle 98144, Seattle 98131, Seattle 98198, Seattle 98121, Seattle 98181, Seattle 98113, Seattle 98166, Seattle 98105, Seattle 98154, Seattle 98138, Seattle 98126, Seattle 98191, Seattle 98117, Seattle 98175, Seattle 98109, Seattle 98161, Seattle 98102, Seattle 98145, Seattle 98133, Seattle 98199, Seattle 98122, Seattle 98185, Seattle 98114, Seattle 98168, Bellevue 98005, Bellevue 98009, Bellevue 98006, Bellevue 98015, Bellevue 98007, Bellevue 98004, Bellevue 98008, Kent 98042, Kent 98030, Kent 98031, Kent 98035, Kent 98032, Kent 98089, Kent 98064, Renton 98059, Renton 98056, Renton 98057, Renton 98058, Renton 98055, Federal Way 98093, Federal Way 98023, Federal Way 98003, Federal Way 98063, Kirkland 98033, Kirkland 98034, Kirkland 98083, Auburn 98001, Auburn 98092, Auburn 98002, Auburn 98071, Redmond 98073, Redmond 98052, Redmond 98053, Sammamish 98074, Sammamish 98075, Bothell 98041, Bothell 98011, Issaquah 98027, Issaquah 98029, Maple Valley 98038, Mercer Island 98040, Kenmore 98028, Snoqualmie 98065, Woodinville 98072, Woodinville 98077, Enumclaw 98022, Vashon 98070, Duvall 98019, Pacific 98047, North Bend 98045, Fall City 98024, Black Diamond 98010, Ravensdale 98051, Medina 98039, Carnation 98014, Preston 98050, Baring 98224, Skykomish 98288, Hobart 98025, Burton 98013, Seahurst 98062
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