Basement Waterproofing & Crawl Space Repair in Western Washington

Permanent solutions for wet basements, crawl space moisture, and foundation leaks. Serving homeowners across Kitsap County, Pierce County, and the Puget Sound region.

Signs Your Basement or Crawl Space Has Water Problems

poor indoor air quality

Professional crawl space repair addresses the underlying source of water intrusion while restoring structural stability.

OUR 4-STEP WATERPROOFING PROCESS

Step 01 — Free Inspection & Assessment
Our certified technician inspects your basement, identifies all active and potential moisture entry points, and
documents findings with photos. No charge, no obligation.
Step 02 — System Design
We design a custom waterproofing system based on your specific soil conditions, water table depth,
drainage patterns, and foundation type. No cookie-cutter solutions.
Step 03 — Commercial-Grade Installation
Our installation crews bring the same protocols used on commercial foundation projects. Every seam is
verified, every drain is tested, and every penetration is sealed before the team leaves.
Step 04 — Final Waterproofing & Sealing
Final inspection, surface sealing, and a full walkthrough with the homeowner. We document the completed
system and issue your written warranty before we leave the jobsite.

Pierce and Kitsap County receive an average of 37 inches of rainfall per year — but the real danger isn't just
the rain. Glacial clay soils left behind by Puget Sound's geological history absorb and retain water, building
up hydrostatic pressure against foundation walls that can force moisture through even hairline cracks.
The Puget Sound water table sits unusually high in many neighborhoods, especially in lower-elevation areas
of Tacoma, Bremerton, Port Orchard, and along the waterfront communities of Gig Harbor. Kitsap's
marine-influenced humidity means that even 'dry' days leave moisture suspended in the air that infiltrates
unprotected basements.
National waterproofing solutions aren't built for these conditions. Our commercial-grade systems are.
• Hydrostatic pressure relief channels rated for PNW soil loads
• Exterior membranes formulated for marine humidity resistance
• Sump systems sized for Pacific Northwest seasonal flow rates

SOLUTIONS WE OFFER

Interior Drainage Systems
Our interior drainage channels are installed at the base of foundation walls, directing water to a sump pump
before it can damage flooring or walls.
• No exterior excavation required
• Minimal disruption to your home
• Suitable for finished and unfinished basements
• Can be installed year-round

Exterior Waterproofing Membranes
Applied to the exterior of foundation walls, these commercial-grade membranes stop water before it contacts
your structure — the most permanent solution available.
• Marine-humidity-resistant formulations
• Continuous coverage with no seams
• Paired with perimeter drainage systems
• Ideal for new construction or full renovations

Sump Pump Installation & Service
We install and maintain commercial-grade sump systems designed for Pacific Northwest seasonal flow
volumes, with battery backup for power outages during storms.

Basement Waterproofing and Crawl Space FAQs:

Q: How much does basement waterproofing cost in Pierce County?
A: Basement waterproofing costs depend on the size of the basement, severity of the moisture problem, and which systems are installed. We provide a detailed, no-obligation written estimate after your free inspection — there are no surprise charges.

Q: How long does basement waterproofing last?
A: When properly installed with commercial-grade materials, basement waterproofing systems can last
20–30+ years. All of our systems come with a written warranty, and we recommend annual inspections to
ensure your system continues performing optimally.

Q: Can you waterproof a basement from the inside?
A: Yes — interior drainage systems and interior waterproofing membranes are effective and often
preferred because they don't require excavating around your foundation. Interior systems intercept water
before it damages your basement and direct it to a sump pump.

Q: What causes basement water intrusion in the Pacific Northwest?
A: The primary causes in Pierce and Kitsap County are: hydrostatic pressure from glacial clay soils that
expand and contract with moisture; high water tables near Puget Sound; heavy seasonal rainfall
saturating soil around foundations; and foundation cracks. Kitsap's marine humidity also accelerates
moisture infiltration even in 'dry' seasons.

Q: Do I need a permit for basement waterproofing in WA?
A: Permit requirements vary by city and county. Interior drainage work often doesn't require a permit,
while exterior excavation typically does. NW Concrete Waterproofing handles all permit applications as
part of your project when required.

Q: How do I know if my basement needs waterproofing?
A: Watch for: water stains or rust-colored streaks on walls or floors, white powdery deposits
(efflorescence) on concrete, musty or earthy odors, visible mold or mildew, damp or wet floors after rain,
cracks in foundation walls or floors, peeling paint or bubbling drywall, and condensation on walls.

SERVICE AREAS

Tacoma, Lakewood, Puyallup, Gig Harbor, Bonney Lake, Auburn, Federal Way, Kent, Renton, Bremerton,
Silverdale, Port Orchard, Belfair, Kingston