Anacortes Siding Building New in Conway? Windows Are Not a Place to Cut Corners
If you're building a new home in Conway, the windows are one of the few components that get exactly one chance to be installed correctly. Once siding, trim, and interior finish go on top of them, any flashing mistake underneath is hidden until it shows up years later as a stain on a wall or soft framing around a rough opening. Conway sits in the low-lying Skagit River delta country, close enough to Skagit Bay that salt-laden air is a constant, and squarely in the path of the wind-driven rain that moves up the valley off the Sound. Add a long, wet moss season that keeps siding and trim damp for months at a stretch, and you have a climate that punishes shortcuts in exterior work faster than most parts of the country.
New-construction window installation is its own discipline, separate from swapping out old windows in an existing house. It happens before siding, while the wall is still just studs, sheathing, and a weather-resistive barrier (WRB). Done right, it sets up decades of trouble-free performance. Done poorly, it bakes a leak path into the wall that nobody will see until the damage is already spreading.
New-Construction vs. Replacement: Why the Distinction Matters
Replacement windows go into an existing opening, usually a "pocket" install where the old frame stays in place and the new unit is fit inside it, or a full-frame tear-out where the opening is exposed but the siding around it already exists and has to be patched back. New-construction windows are different: they have a nailing fin (sometimes called a nail flange) around the perimeter that gets fastened directly to the sheathing, and the entire flashing sequence — sill pan, side flashing, head flashing, WRB integration — happens from scratch, in the correct order, before any exterior finish goes on.
That sounds like it should make new construction the easier job. In some ways it is, because there's no old material to work around. But it also means there's no forgiveness. A missed step in the flashing sequence on a replacement window is sometimes caught later because the surrounding siding has to be disturbed again eventually. On a new build, that same mistake gets sealed inside the wall assembly for the life of the house.
What This Means for a Conway Build Specifically
Homes in this part of Skagit County take sustained wind-driven rain from more than one direction over a wet season, not just an occasional storm. A window detail that would get away with a minor flaw in a drier climate doesn't get the same pass here. We treat every new-construction window opening as a water-management system, not just a hole with a frame in it.
What Skagit County's Climate Actually Demands
- Salt air: proximity to Skagit Bay means airborne salt accelerates corrosion on fasteners, hardware, and any exposed metal flashing that isn't rated for it.
- Driving rain: wind-driven rain pushes water sideways and upward under trim and flanges, not just straight down — flashing laps have to be shingled correctly with this in mind.
- Long moss season: extended damp periods keep exterior surfaces wet for days at a time, which means any gap in the water-shedding sequence has more time to do damage before it dries out.
- Low-lying delta setting: Conway's position in the flatter, wetter part of the valley near the Skagit River delta means higher ambient humidity and a higher water table than homes up on drier ground, which affects how a house breathes and how quickly incidental moisture dries.
None of these factors are dramatic on their own. Together, over the life of a house, they're exactly why window installation quality matters more here than it would in a dry, inland climate.
The Installation Sequence That Actually Keeps Water Out
There's no shortcut version of this that holds up long-term. The order matters as much as the materials.
- Rough opening inspection — square, plumb, correct dimensions, sheathing intact and dry before anything else happens.
- Sill pan flashing installed first, sloped to drain outward, so any water that gets past the window later has somewhere to go besides the framing.
- Side (jamb) flashing integrated with the WRB in the correct shingle-lap order — always working from the bottom up so water sheds over each layer below it.
- Window set into the opening, checked for level, plumb, and square, then fastened through the nailing fin per the manufacturer's schedule.
- Head flashing installed last over the top fin, lapped correctly under the WRB above it so water is directed out and away, not behind the flashing.
- Backer rod and appropriate sealant at the interior and exterior, sized and placed to manage air and water without trapping moisture in the assembly.
- Interior air-sealing at the rough opening perimeter, which affects both energy performance and condensation risk.
Skipping the sill pan, reversing a flashing lap, or relying on caulk alone in place of proper shingled flashing are the most common shortcuts we see — and they're also the ones most likely to fail quietly, since the wall covers the mistake for years before it shows.
Choosing a Window Package for New Construction
Frame material is a real decision on a new build, since you're choosing it once for the life of the house rather than upgrading an existing unit. There's no single right answer — it depends on budget, exposure, and how much upkeep you want to take on.
| Frame Type | Moisture / Salt-Air Behavior | Maintenance | General Cost Position |
|---|---|---|---|
| Vinyl | Won't rot or corrode; performs well in coastal, damp climates | Low — occasional cleaning | Most economical |
| Fiberglass | Very stable in temperature swings and moisture; strong long-term coastal performer | Low | Mid to upper-mid |
| Wood-clad | Good performance if detailing and finish are maintained; clad exterior protects the wood, but any breach lets moisture reach it | Higher — finish and seals need periodic attention | Highest |
| Aluminum (uncoated) | Prone to corrosion in salt air unless properly finished; also a poor thermal performer | Moderate to high | Varies |
For a Conway build, we lean toward vinyl or fiberglass for most projects specifically because of the salt-air and moisture exposure — not because wood-clad windows are a bad product, but because they ask for more ongoing attention in exactly the conditions this area produces. If a wood-clad look matters to you architecturally, it's still a viable choice; we just make sure you go in with clear eyes about the maintenance commitment.
How We Work With Builders and Owner-Builders
Most new-construction window jobs come to us one of two ways: as the window and exterior subcontractor working directly for a general contractor, or as the exterior specialist brought in by an owner-builder managing their own project. Either way, the process looks the same:
- Review the plans and window schedule before framing is finalized, so rough openings are sized correctly the first time.
- Confirm the WRB and flashing strategy with whoever is doing the building wrap, so there's no gap in responsibility between trades.
- Install in the sequence above, inspecting each opening before it's covered by trim or siding.
- Document the install where it's useful for warranty purposes, since manufacturer warranties on new-construction windows are frequently tied to correct installation per their instructions.
Coordinating cleanly with framers, siding crews, and the GC's schedule is a big part of getting this right — window installation on a new build isn't an isolated task, it's one step in a sequence where every trade before and after it affects the outcome.
Mistakes We Find When We're Called to Fix Someone Else's New Build
We occasionally get called to a newer home in the Conway area with a window leak, and the underlying cause is almost always one of the same few things: a missing or improperly sloped sill pan, flashing installed in the wrong order (head flashing tucked under the WRB but side flashing left on top of it, or similar), sealant used as a substitute for proper flashing instead of a supplement to it, or fasteners that weren't rated for the salt-air environment showing early corrosion. None of these are exotic problems. They're all avoidable with a correct, unhurried install the first time.
Checklist: What to Confirm Before Windows Go In
- Rough openings are square, plumb, and correctly sized for the specified window units
- Sheathing is dry and undamaged before the WRB goes on
- Sill pan flashing is installed and sloped to drain outward
- Flashing sequence follows proper shingle-lap order, bottom to top
- Fasteners and hardware are appropriate for a salt-air environment
- Window units are checked level, plumb, and square before final fastening
- Sealant and backer rod are sized correctly, not used as a substitute for flashing
- Interior air-sealing at the rough opening is completed and inspected
Why a Crew That Already Works Conway Matters
Conway isn't a big place, but it has its own conditions worth knowing before the first window goes in: the delta lowland setting brings a higher water table and more sustained dampness than drier parts of Skagit County, and homes here take wind-driven rain from the direction of the valley and the Bay in a way that inland Skagit County builds don't experience the same way. A crew that's worked this specific area already knows to size the flashing and sealing details for that reality instead of applying a generic approach and hoping it holds. We're also familiar with the county's building department expectations for new construction inspections, which keeps the schedule moving instead of stalling on avoidable back-and-forth.
If you're planning a new build in Conway, or working with a GC who needs a window and exterior subcontractor who already understands this stretch of Skagit County, we're happy to walk the plans with you and put together a free, no-pressure estimate — no obligation, just a straight look at what your project needs.