Deck Waterproofing & Flashing in Martha Lake, WA
Walkable waterproof coatings, slope fixes and flashing that keep water out of your walls and ceilings. 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 Martha Lake and nearby Mill Creek and Lynnwood.
Before
AfterFlashed and rebuilt
Why waterproofing comes up so often in Martha Lake
When we trace a leak on a Martha Lake house, the culprit is usually a flashing detail that was skipped or has worn out. Roof edges that end against a sidewall with no kick-out, ledgers bolted directly over siding, and windows that rely on a bead of caulk all show up regularly. Damp lake air means those small leaks never get a chance to dry. Our fix is to retrofit kick-outs and metal ledger flashing, set sill pans under windows and patio doors, and put a true walkable membrane on any deck that covers a room, sloped so water runs off the edge.
Martha Lake is an unincorporated community wrapped around a small lake between Lynnwood and Mill Creek. Housing ranges from 1960s and 1970s ramblers and split-levels close to the water to 1980s and 1990s two-story subdivision homes farther out, plus newer townhomes and infill along the 164th Street corridor. Common siding includes cedar lap, hardboard, T1-11 on older homes and vinyl on some updates. Most houses have a back deck, often built of pressure-treated lumber, and lakefront lots usually add a lower deck or dock path stepping down toward the shoreline.
Morning fog and still air off the lake keep the neighborhoods closest to the shoreline damp, especially in late fall and winter. Homes facing the water catch light wind and spray from the lake surface, and north-facing walls in the area can go weeks without real drying. Large evergreens around older parcels add shade and needles. Away from the lake, newer homes deal with more standard Puget Sound weather, but tight lot spacing between houses limits airflow and keeps side walls wet longer than you would expect.
Our crew comes out from our Woodinville office, and we also work in nearby Mill Creek, Lynnwood, Bothell and Lake Stickney.
When to call about waterproofing in Martha Lake
- Stains or drips on the ceiling below a deck or balcony
- A deck that slopes toward the house
- Cracked, peeling or soft deck coating
- Rot or stains under windows and doors
- 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 Martha Lake
What we do in Martha Lake
Walkable deck coatings
Waterproof coating systems for decks and balconies over living space.
Leak investigation
We trace leaks to the source before anything is sealed.
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.
Door and sill pans
Pan flashing under doors, where many balcony leaks start.
Neighborhoods and permits in Martha Lake
Lakefront homes on Martha Lake face the most moisture, with lower decks and walls that rarely dry out. Neighborhoods near Martha Lake Airport Park and the subdivisions east toward Mill Creek have newer homes on tighter lots. Streets near Interstate 5 and the 164th Street corridor include a mix of older ramblers and recent townhomes, while the areas north toward Alderwood Manor have older homes on larger wooded parcels.
Because Martha Lake is unincorporated, the permitting authority is Snohomish County Planning and Development Services, not Lynnwood or Mill Creek. Patching trim or siding with matching material is often exempt; framing repairs, new decks and full re-siding normally are not. Lakefront projects can raise shoreline questions, so we check with the county 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 Martha Lake
| 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 Martha Lake 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 Martha Lake: cost and timing
Most common causes
Decks that slope toward the house
Flat or back-sloped surfaces push water against the wall and door thresholds.
Missing kick-out flashing
Roof water runs down the wall instead of into the gutter and soaks the siding and framing.
Doors without sill pans
Water that gets under a threshold runs into the subfloor and the room below.
What drives the price in Martha Lake
Waterproofing in Martha Lake 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 Martha Lake say
“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…”
“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…”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Martha Lake homeowners ask about waterproofing
Is rot worse on lakefront homes in Martha Lake?
Can you coat over my existing deck in Martha Lake?
What is kick-out flashing?
Do you fix leaks around windows?
How often should a deck coating be recoated?
More from our crew in Martha Lake
Waterproofing near Martha Lake
Tell us about your waterproofing project in Martha Lake
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free waterproofing inspection in Martha Lake
We inspect the damage on-site, show you photos of what we find and give you a written price before any work starts.