Deck Waterproofing & Flashing in Medina, 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 Medina and nearby Bellevue and Kirkland.
Before
AfterFlashed and rebuilt
Why waterproofing comes up so often in Medina
Waterfront homes in Medina have complex exteriors: roof decks, terraces over living space, large window walls and multiple rooflines. Every one of those details depends on flashing and membranes working correctly. We find failed membranes at deck-to-wall transitions, missing kick-out flashing at roof corners, and window walls without proper pans. We install self-adhered and liquid-applied membranes, metal ledger and Z-flashing, kick-outs and door and window pans. Each detail is lapped and sealed to shed water away from the structure, which matters on a home facing open water.
Medina is a small, mostly residential city on the Lake Washington shore, and its homes range from 1950s and 60s houses on large lots to substantial newer estates built after older homes were removed. Many properties have cedar siding, cedar shake accents, painted wood trim and multi-level decks or terraces facing the water. Inland streets near Overlake Golf and Country Club have large custom homes on landscaped lots. Evergreen Point, at the north end near the SR 520 bridge, holds waterfront homes with docks, boathouses and outdoor structures exposed directly to the lake.
Medina’s waterfront location means homes face wind and spray off Lake Washington, especially on west and south walls. Mature landscaping and large trees shade many properties, which keeps decks, trim and lower walls damp for extended periods. Long, gray winters slow drying even where sun reaches. Large windows and wide decks on lake-facing sides take the brunt of storms. Irrigation and landscape beds placed close to walls can add moisture where siding meets the foundation.
Our crew comes out from our Woodinville office, and we also work in nearby Bellevue, Kirkland, Redmond and Mercer Island.
When to call about waterproofing in Medina
- Streaks down the wall below a roof edge
- Stains or drips on the ceiling below a deck or balcony
- A deck that slopes toward the house
- Water pooling against the house after rain
- Rot or stains under windows and doors
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 Medina
What we do in Medina
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.
Door and sill pans
Pan flashing under doors, where many balcony leaks start.
Window head flashing
Flashing and tape around windows to stop leaks into the wall.
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.
Neighborhoods and permits in Medina
Homes on Evergreen Point and along the waterfront take direct exposure off the lake, so view decks, lake-facing windows and docks show wear first. Inland properties near Overlake Golf and Country Club are more sheltered but heavily landscaped, and shade and irrigation drive rot at lower walls and trim. Older mid-century homes remaining between the newer estates often have original wood siding and minimal flashing details.
Replacing a piece of trim or several deck boards with matching material is often permit-free. Framing repairs, new decks and larger siding or window projects generally require review. Medina is a small city that pays close attention to exterior work, so we speak with the City of Medina early and build any permit and inspection steps into the plan.
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 Medina
| 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 Medina 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 Medina: 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 Medina
Waterproofing in Medina 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 Medina 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…”
“Very professional, quick to respond, and able to schedule the work on short notice they treated our home and deck with care and did an excellent job. I would definitely hire them again for a future project.”
5.0 average from 106 reviews on Google, Thumbtack, Angi, HomeAdvisor and Yelp. Read our reviews on Google.
Questions Medina homeowners ask about waterproofing
Why do lake-facing walls on my Medina home show more damage?
Can you coat over my existing deck in Medina?
Why is water leaking under my deck or balcony?
What is kick-out flashing?
Why does my ceiling leak only in heavy rain?
More from our crew in Medina
Waterproofing near Medina
Tell us about your waterproofing project in Medina
- Licensed, bonded & insured
- Free on-site estimates
- 24-month workmanship warranty
Book a free waterproofing inspection in Medina
We inspect the damage on-site, show you photos of what we find and give you a written price before any work starts.