Deck Waterproofing & Flashing in Woodway, WA
Leaks under a deck or balcony? We find where the water gets in and seal it for good. When coatings wear through or flashing is missing at doors and walls, the leak often shows up far from where water gets in. We trace it to the source, replace any wet framing, correct slope and flashing, and finish with a walkable surface that drains away from the house. We serve homeowners across Woodway and nearby Edmonds and Shoreline.
Before
AfterNew siding and trim around the window
Why waterproofing comes up so often in Woodway
Woodway homes often feature terraces, balconies and decks over living space, along with complex rooflines that meet walls in many spots. Every one of those details depends on good flashing. We find missing kick-outs, ledgers with no metal protection, door thresholds without pans, and membranes that have cracked or lifted after years under shade and needle litter. Our work includes installing walkable membranes with flashed edges, adding kick-out and ledger flashing, building sill pans at doors and sealing penetrations properly. On a Woodway home with a lot of roof-to-wall transitions, that detailing is what keeps the framing dry.
Woodway is a small residential town of custom homes on large, heavily treed lots tucked between Edmonds and Shoreline. Houses here were mostly built one at a time rather than as tracts, ranging from 1950s and 60s ranch homes and Northwest contemporaries to sizable two-story designs from the 1980s and 90s, plus newer estate homes. Cedar siding in lap, shingle or board-and-batten patterns is common, often stained rather than painted. Many homes have expansive decks, terraces and covered outdoor rooms facing the woods or the Sound. Long driveways, steep grades on the western side and mature landscaping mean most houses sit well back from the street.
Woodway occupies a high bluff above Puget Sound, and its western edge faces open water toward Kingston and the Olympics. Storms moving up the Sound strike those homes with wind-driven rain and salt. Farther inland, the defining condition is shade: a tall canopy of Douglas fir, western red cedar and bigleaf maple keeps roofs, siding and decks damp long after the rain stops. Needles and leaves pile up on roofs and in gutters. The result is moss, slow drying and rot that develops quietly beneath stained cedar and along roof edges.
Our crew comes out from our Woodinville office, and we also work in nearby Edmonds, Shoreline, Lynnwood and Mountlake Terrace.
When to call about waterproofing in Woodway
- Rot or stains under windows and doors
- Water pooling against the house after rain
- A deck that slopes toward the house
- Cracked, peeling or soft deck coating
- Streaks down the wall below a roof edge
Our waterproofing process, step by step
Trace the leak
Moisture readings, inspection openings and photos to find the real source.
Repair the substrate
Rotted plywood, joists or sheathing are replaced before sealing.
Correct slope and details
Proper slope, sill pans and flashing at every edge and door.
Apply the system
Primer, membrane and walkable top coat applied in layers.
Water test
We test the problem areas and show you the finished details.
Recent waterproofing projects near Woodway
What we do in Woodway
Slope correction
Fix flat or back-sloped decks so water drains away from the wall.
Kick-out flashing
Diverts roof water away from the wall at roof-to-wall joints.
Window head flashing
Flashing and tape around windows to stop leaks into the wall.
Walkable deck coatings
Waterproof coating systems for decks and balconies over living space.
Door and sill pans
Pan flashing under doors, where many balcony leaks start.
Leak investigation
We trace leaks to the source before anything is sealed.
Neighborhoods and permits in Woodway
Homes along the western bluff take the strongest weather from the Sound, so view-side decks, windows and siding fail first. Interior lots off Woodway Park Road are more sheltered but sit under the densest canopy, keeping roofs, fascia and lower walls wet. Near the town’s eastern edge by Firdale Village, lots are somewhat smaller and get more sun. Properties on the slopes dropping toward the shoreline face drainage and access challenges that affect decks, foundations and lower framing.
For homes inside town limits, permits go through the Town of Woodway rather than Edmonds or the county. Replacing a few siding boards or trim pieces with matching material often needs nothing, but a new deck, framing repairs or a big re-siding job usually requires approval, and wooded or steep lots can involve tree or slope review. We check with the town before starting.
Deck and balcony surface options
| System | Best for | Expected life | Maintenance |
|---|---|---|---|
| Recoat existing membrane | Sound surface with a worn top coat | A few years per top coat | Keep drains clear, recoat when worn |
| New walkable membrane | Decks and balconies over living space | 10–15+ years | Top coat every few years |
| Membrane under decking | Dry space under a deck with a wood or composite surface | 15+ years | Keep gaps and drains clear |
| Rebuild, slope and membrane | Wet or rotted plywood, flat or back-sloped deck | 15+ years | Top coat every few years |
What waterproofing typically costs in Woodway
| Project | Typical scope | Price range | Timeline |
|---|---|---|---|
| Flashing repair | Kick-out, head flashing or a door pan at one spot | $600 – $2,500 | 1 day |
| Recoat a balcony | Prep and top coat over a sound membrane | $1,500 – $4,500 | 2–3 days |
| New walkable membrane | Full membrane system on a deck or balcony | $5,000 – $14,000 | 4–7 days |
| Rebuild and waterproof | New plywood, slope correction, flashing and membrane | $12,000 – $30,000+ | 1–3 weeks |
These are typical 2026 ranges we see for waterproofing in Woodway and nearby cities. Your price depends on what we find once the area is open, access and height, and the materials you choose. Every estimate is free, in writing and based on an on-site inspection with photos.
Waterproofing in Woodway: cost and timing
Most common causes
Missing kick-out flashing
Roof water runs down the wall instead of into the gutter and soaks the siding and framing.
Decks that slope toward the house
Flat or back-sloped surfaces push water against the wall and door thresholds.
Doors without sill pans
Water that gets under a threshold runs into the subfloor and the room below.
What drives the price in Woodway
Waterproofing in Woodway depends on the size of the deck or balcony, how much substrate has to be replaced, slope correction and how many doors and walls need new flashing. Recoating a sound surface costs far less than rebuilding a wet one. You get a written price after we trace the leak.
Typical timeline
A recoat over a sound deck usually takes a few days including cure time. Rebuilding plywood, slope and flashing takes about one to two weeks, depending on weather.
Backed by a 24-month workmanship warranty
Written scope
You know exactly what is included before work starts, with photos of what we found.
Our own crew
The people who quote your job are the people who do it, start to finish.
Clean site daily
Debris is hauled away and your yard is left the way we found it.
24 months covered
If our workmanship fails within two years, we come back and make it right.
What homeowners near Woodway say
“I had a great experience working with Eco Home Repair on a water damage project. Water was leaking into the house through the chimney, which caused mold and water damage issues. Eco Home Repair handled everything smoothly and professionally. They replaced the…”
“One of my windows leaked after I had them cleaned and so I called Eco Home Repair to take a look. I really appreciated the thorough inspection - they determined the leak was unique to the aggressive window washing and wouldn't happen in regular rain (it had…”
“I hired Eco Home Repair to do a leak repair under my balcony, deck waterproofing and slope correction, and underlying rot repair. They were professional, quick, and fairly priced; kept me in the loop throughout the whole process and was honest about what…”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Woodway homeowners ask about waterproofing
Do heavily shaded lots in Woodway need extra exterior maintenance?
Can you coat over my existing deck in Woodway?
What is kick-out flashing?
Do you fix leaks around windows?
How often should a deck coating be recoated?
More from our crew in Woodway
Waterproofing near Woodway
Tell us about your waterproofing project in Woodway
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free waterproofing inspection in Woodway
We inspect the damage on-site, show you photos of what we find and give you a written price before any work starts.