About TerraFirma Foundation Systems in Seattle, Washington
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Products & Services
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
UltraSump Battery Back Up
Sanidry Dehumidifier

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

TerraFirma Foundation Systems serving Seattle, WA

Happy Customers Surrounding Seattle, WA
Work Requests

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Are you looking for help with basement waterproofing or crawl space encapsulation in Seattle? TerraFirma Foundation Systems is one of Washington’s largest and most trusted home repair companies. We specialize in repairing wet basements and damp crawl spaces. You can trust that you’re getting the best solution for your home, no matter what the problem.

Learn about the services we provide in Seattle and the surrounding area, or call us today to schedule your free inspection and estimate!

Basement Waterproofing Solutions for Your Seattle, WA Home

If you have a damp, leaky basement or issues with basement flooding, TerraFirma Foundation Systems is your expert for a proven, cost-effective basement waterproofing solution. No matter what’s causing your wet basement problem, we can fix it! We’ll inspect your home inside and out and design and install a waterproofing system to meet your needs.

Having a wet or leaky basement is not only an inconvenience, but the moisture, dampness and mold caused by the water can lead to health problems and added repair expenses. That’s why we offer a full range of basement repairs and waterproofing solutions designed to tackle the problem:

  • Sump pump installation, repair & replacement
  • Interior drainage systems
  • Wall and floor crack repair
  • Dehumidifiers
  • Gutter downspout extensions
  • Vapor barrier
  • Insulated basement wall panels
  • Egress windows

Proven Crawl Space Encapsulation

Do you have a damp, nasty crawl space below your home? How about musty odors inside your home or cold floors over your crawl space? TerraFirma Foundation Systems solves these problems with our state-of-the-art crawl space encapsulation system.

We use the patented CleanSpace Crawl Space Encapsulation System to eliminate excess moisture and musty smells. Crawl space insulation is added to the walls for added comfort and energy efficiency. What you get is a dry, usable crawl space and improved comfort and healthier air inside your home.

We offer a full range of crawl space repair solutions in Seattle, including:

  • Crawl space dehumidifiers
  • Crawl space sump pumps
  • Crawl space drainage systems
  • Crawl space doors and access wells
  • Crawl space structural supports

Our patented WaterGuard drainage system doesn’t require excavation, can typically be installed in just two days and includes a transferable lifetime warranty! Contact us to learn more and get a free basement inspection and repair estimate.

Our inspectors have a minimum of 10 years of industry experience and their focus is to understand the cause of your specific problem and recommend the best solution for your home. Contact us today to schedule a free inspection of your foundation, basement, crawl space or concrete in Seattle or the surrounding area.

Work Requests From Seattle, WA
in Seattle
Small crack in foundation that is allowing some moisture in. Small pooling of water has begun during heavy rain
in Seattle
New construction as of 1 year. Unfinished basement we want to finish. In Feb this year, water seeped through foundation on the wettest dat of the year (2/9 - snow melt and heavy rain). Rerouted downpipes from roof but want to ensure the problem is resolved and there aren't other issues before we finish the basement.
BEACON AVE S in Seattle
in Seattle
Flooded basement
in Seattle
Would like to replace one basement window with a new, egress-compliant window.
Corliss Ave N in Seattle
We are looking for an estimate to complete some waterproofing issues in our basement.
in Seattle
Have an older home (1914) that had some minor water issues in the basement last winter. would like to avoid a similar situation this season.
S Lander St in Seattle
Would to set up backup battery system for basement sump pump in case power goes off in large storm and water is still entering home.
in Seattle
Basement floor gets wet after big rains
N in Seattle
Looking for quote on egressed window installation.
S Brighton St in Seattle
Just bought a new house and have been told by the previous owners there was water leakage on one side of the basement. Looking to get a quote to fix that and also to enlarge three existing basement windows into legal egress windows and possibly add a fourth window. Thanks!
in Seattle
French drain causing a back up to my crawl space.
in Seattle
Primarily egress window, but the requirements put it into part of a walkway. also some water issues in the basement
in Seattle
I have an existing window in my basement that is short (14") and wide (44") that I would like to make into a egress window. Distance from the ground outside to the 44" max height from inside floor is ~24". I would like a quote for digging the well out and installing a new window that meets egress code. Thank you!
in Seattle
Water appears in basement after rains. Problem appeared to be fixed with external grading, but the intense rains we had a couple months back brought water back inside.
Beacon Ave South in Seattle
We are planning a basement remodel and would like to get Egress Windows.
Corliss Ave. N in Seattle
I have a basement that is completely clear down to slab and foundation wall and would like to finish it. Ready except am in need of interior french drain with pump to prevent water infultration. Been a problem for several years and now at point where it needs to be remedied. Investigating my options and the waterguard system seems to be the least invasive? Interested in getting an estimate to have this work done in a timely manner.
Holman Road NW in Seattle
Basement floor crack and perimeter drainage
in Seattle
I want to get information about weatherproofing the basement of the house that I bought this past November. It leaked a bit over the winter, and it has several uninsulated portions.
E Green Lake Way N in Seattle
Standing water in basement/garage after heavy rains 3-5 times a year (winter), coming in through floor slab due to hydrostatic pressure.
Serving the following Seattle, WA zip codes
98101, 98102, 98103, 98104, 98105, 98106, 98107, 98108, 98109, 98111, 98112, 98113, 98114, 98115, 98116, 98117, 98118, 98119, 98121, 98122, 98124, 98125, 98126, 98127, 98129, 98131, 98133, 98134, 98136, 98138, 98139, 98141, 98144, 98145, 98146, 98148, 98154, 98155, 98158, 98160, 98161, 98164, 98165, 98166, 98168, 98170, 98174, 98175, 98177, 98178, 98181, 98185, 98188, 98190, 98191, 98194, 98195, 98198, 98199