Deck Waterproofing & Flashing in Kirkland, 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 Kirkland and nearby Kenmore and Bellevue.
Before
AfterFlashed and rebuilt
Why waterproofing comes up so often in Kirkland
Kirkland has a lot of flat roofs, roof decks and walk-out balconies on newer homes, and these are only as good as their membranes and transitions. We find failed membrane seams, door thresholds with no pan, and parapet caps that let water into the wall below. On older homes, the usual culprit is a roof edge that ends against a wall with no diverter. We put down new membranes sloped to drain, add metal at ledgers and siding transitions, fit kick-outs, and pan every door. Layers are shingled so water moves outward and down, which matters on a house that faces a windy lake.
Kirkland mixes older lakefront cottages and 1950s and 60s ramblers with a wave of modern rebuilds. Neighborhoods like Norkirk, Market and Lakeview still have early-century bungalows and mid-century homes with wood lap siding. Juanita, Finn Hill and Kingsgate filled out in the 1960s through 80s with split-levels and two-story homes, often on wooded or sloped lots. Rose Hill and Houghton have seen many teardowns replaced by contemporary houses with fiber cement panels, flat or low-slope roofs and minimal eaves. Townhomes and condos cluster around Totem Lake and downtown, often with small decks and balconies.
Lake Washington sets the tone for Kirkland’s exterior wear. West-facing walls along the waterfront and on the slopes above Moss Bay and Juanita Bay take storms rolling across the lake with little to break the wind. Up on Finn Hill, tall second-growth forest keeps houses shaded and damp much of the year. Winter rain arrives sideways on windy days, finding gaps at window heads and deck ledgers. Modern homes with almost no overhang give siding none of the shelter older designs provided, so flashing quality matters more here.
Our crew comes out from our Woodinville office, and we also work in nearby Kenmore, Bellevue, Redmond and Bothell.
When to call about waterproofing in Kirkland
- Cracked, peeling or soft deck coating
- Streaks down the wall below a roof edge
- A deck that slopes toward the house
- Stains or drips on the ceiling below a deck or balcony
- Water pooling against the house after rain
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 Kirkland
What we do in Kirkland
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.
Kick-out flashing
Diverts roof water away from the wall at roof-to-wall joints.
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.
Walkable deck coatings
Waterproof coating systems for decks and balconies over living space.
Neighborhoods and permits in Kirkland
Along Lake Washington Boulevard and in Houghton, lake exposure hits view decks, large windows and west walls hardest. Finn Hill and upper Juanita are deep-shade neighborhoods where moss, needle-clogged gutters and damp fascia drive most of the damage. In Rose Hill and Kingsgate, aging 1970s split-levels show rot at lower siding and entry steps. Around Totem Lake and downtown, newer multi-family buildings tend to have balcony and window flashing issues instead.
A short run of fascia or a handful of siding boards swapped for identical material is typically exempt. Once a job involves framing, a new or rebuilt deck, or a large area of siding, a permit is generally expected. The City of Kirkland is the authority here, and we sort out what applies before our crew shows up, then schedule inspections around the work.
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 Kirkland
| 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 Kirkland 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 Kirkland: cost and timing
Most common causes
Worn deck coatings
Coatings wear through first at doors, edges and posts, and water reaches the plywood underneath.
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 Kirkland
Waterproofing in Kirkland 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 Kirkland 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…”
“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…”
“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…”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Kirkland homeowners ask about waterproofing
Can you repair a lake-view deck on a steep Kirkland lot?
Can you coat over my existing deck in Kirkland?
What is kick-out flashing?
Do you fix leaks around windows?
Why does my ceiling leak only in heavy rain?
More from our crew in Kirkland
Waterproofing near Kirkland
Tell us about your waterproofing project in Kirkland
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free waterproofing inspection in Kirkland
We inspect the damage on-site, show you photos of what we find and give you a written price before any work starts.