Showers · Floors · Ventilation
Bathroom Waterproofing in Bellingham, WA
Water damage in a bathroom usually starts where you can’t see it: behind shower tile, under the tub, or beneath the floor. Bathroom Remodeling Bellingham builds bathrooms with continuous waterproofing systems and proper ventilation, so moisture from daily showers and our wet Pacific Northwest climate stays out of your walls and subfloor.
Licensed & insured in Washington · Permits handled · 15+ years · 200+ local projects
Waterproofing services
Call for a free estimate:
(360) 355-9519
510 Carolina St, Bellingham, WA 98225
15+
Years remodeling bathrooms
200+
Projects in Whatcom County
WA
Licensed & insured
Permits
Handled for you
Why it matters
Tile and Grout Are Not Waterproof
A lot of people are surprised to learn that tile and grout let water through. Grout is porous, and over time water soaks into whatever is behind it. If that’s bare drywall or wood, you get mold, rot, and loose tile.
Bellingham gets around 36 inches of rain a year, and indoor air stays damp much of the year. That makes a real waterproof layer and a fan that actually removes steam even more important here than in drier climates.
What we do
Bathroom Waterproofing Services
We waterproof new showers and bathrooms, and fix the damage when older ones fail.
Shower waterproofing
A continuous membrane on shower walls and floor, with sealed seams, corners, niches, benches, and pipe openings.
Shower pans
Sloped, sealed shower bases that direct every drop to the drain, flood-tested before tile goes on.
Tub surround waterproofing
A waterproof layer behind tub-and-shower walls, not just water-resistant drywall.
Floor waterproofing
Waterproofing wet-area floors, especially around curbless showers and tubs, to protect the subfloor.
Ventilation upgrades
Exhaust fans sized for the room and ducted outdoors, not into the attic, with timers or humidity sensors.
Water damage repair
Removing wet materials, fixing rot in framing and subfloor, and rebuilding the area the right way.
The system
How We Keep Water Out of Your Walls
Waterproofing works as a system. Every part has to be done right.
Membrane
We use waterproofing membranes that meet ANSI A118.10, applied continuously across walls, floors, and every seam and corner.
Slope & drain
The shower floor slopes to the drain, and the membrane ties into the drain so water has only one way out.
Ventilation
A properly sized fan vented outside removes humid air after every shower, so moisture doesn’t soak into ceilings and walls.
Washington follows the Uniform Plumbing Code (WAC 51-56) for shower pans and drains. When plumbing is changed, we pull the permit and schedule the inspection.
How it works
Our Waterproofing Process
Each layer is checked before the next one goes on.
01
Inspect
We look for signs of moisture damage, check the fan, and open up problem areas if needed.
02
Repair & build
We remove damaged materials, repair framing and subfloor, and build a sloped base and flat walls.
03
Waterproof & test
We install the membrane, flood-test the shower pan, then tile and finish.
Cost
How Much Does Bathroom Waterproofing Cost?
Waterproofing is usually part of a shower or bathroom remodel rather than a separate job. The cost depends on the size of the area, the membrane system, and how much existing damage needs repair first.
We’ll show you exactly what’s included in your estimate, line by line.
Warning signs
| What you see | What it can mean |
|---|---|
| Musty smell, recurring mold | Moisture trapped behind tile or poor ventilation |
| Loose or cracked tile | Water behind tile or a flexing floor |
| Ceiling stain below | Failed shower pan or tub seal |
| Peeling paint, fogged mirror long after showers | Fan too small or not vented outside |
FAQ
Bathroom Waterproofing FAQs
Common questions about waterproofing bathrooms and showers. Don’t see yours? Call us at (360) 355-9519.
Related services
More Bathroom Services in Bellingham
Free estimate
Worried About Water Damage?
Call us and we’ll inspect your bathroom for moisture problems and explain what we find in plain language.
Bathroom Remodeling Bellingham · 510 Carolina St, Bellingham, WA 98225 · (360) 355-9519