What's the real difference between new-construction and replacement windows?

New-construction windows have a nailing fin that fastens to open framing and integrates with the house wrap before siding goes on, giving a more complete flashing system. Replacement windows fit into an existing opening without disturbing the surrounding wall, which is a different install method with different trade-offs. New construction is the right call any time framing is still open, since it allows the more thorough flashing approach.

What should I ask a contractor before hiring them for new-construction window installation?

Ask them to walk you through their exact flashing sequence — sill pan, then jambs, then head, properly lapped — and how they coordinate that with whichever siding crew installs next. Ask whether they carry current liability insurance and how they handle a flashing issue found after the wall is closed up. A contractor who can answer specifically, rather than in general terms, is usually the safer bet.

Do you install a specific window brand, or work with whatever the builder specs?

We can work with most major window manufacturers and don't push one brand as universally best — the right choice depends on budget, design, and how exposed the specific opening is to wind and salt air. What we do insist on is correct installation regardless of brand, since even a premium window fails early if the flashing behind it is wrong. We're glad to walk through options during the estimate.

Is fiberglass or vinyl the better frame choice for a home near the water?

Both hold up well against salt air when detailed correctly — vinyl is a strong value option with low maintenance, while fiberglass offers more dimensional stability and is worth considering on more wind-exposed elevations. Unclad wood requires far more upkeep in this climate and isn't something we'd recommend without a real commitment to refinishing. We size the recommendation to the specific elevation's exposure, not a blanket answer.

Does Whatcom County require specific inspections for new-construction window installs?

Yes — new construction typically goes through standard building department inspections that include the window and flashing details before the wall can be closed up with siding. Working with a crew familiar with local inspection expectations helps keep documentation and sequencing on schedule. We coordinate our install timing so flashing is ready and visible when inspection is scheduled.

New-Construction Windows in Marietta, Semiahmoo, WA

Building New in Marietta? Get the Windows Right the First Time

New-construction windows are installed into open framing before siding, house wrap, and trim go on — not popped into an existing opening after the fact. That distinction matters more in Marietta than in a lot of places, because this stretch of Semiahmoo sits close enough to saltwater and open exposure that the window installation itself becomes part of the home's weather defense system, not just the glass and frame. Get the flashing sequence wrong at framing stage and you won't see the consequences for years — by then it's hidden behind finished walls.

Whether you're a builder framing a spec home, a homeowner working with a general contractor on new construction, or adding a heated addition that requires new-construction-style windows rather than a retrofit, the install method has to match what this part of Whatcom County actually throws at a building envelope.

What Marietta's Climate Actually Demands

Salt Air and Corrosion

Proximity to Semiahmoo Bay and the Strait of Georgia means airborne salt is a real factor, not a theoretical one. Salt-laden air accelerates corrosion on unprotected fasteners, cheap window hardware, and some aluminum components. It doesn't mean windows fail — it means hardware and fastener selection have to account for it from the start, rather than being an afterthought discovered at the five-year mark.

Driving Rain and Wind-Driven Wet

Storms off the water don't just bring rain straight down — they push it sideways into wall assemblies. A window that would perform fine in a sheltered inland lot can leak here if the sill pan, flashing laps, and sealant details aren't done in the correct order. Wind-driven rain finds every shortcut in a flashing job eventually.

Moss Season and Prolonged Damp

Whatcom County's long wet season keeps exterior surfaces damp for extended stretches, which is exactly the environment moss, algae, and mildew need to take hold. Around window openings, that means trim boards, sills, and the transition between window and siding need details that shed water quickly rather than holding it against the wall.

What a Correct New-Construction Window Install Actually Involves

New-construction windows come with a nailing fin around the perimeter that gets fastened directly to the framing, then integrated into the water-resistive barrier (WRB) before siding is installed. Done correctly, the sequence looks like this:

Rough opening is checked for square, level, and correct dimension before the window ever arrives on site.
A sloped sill pan is installed at the bottom of the opening so any water that gets past the glazing has somewhere to go — outward, not into the framing.
Self-adhered flashing membrane is applied at the sill and jambs first, then the window is set, then head flashing goes on last — always shingle-lapped so upper layers overlap lower ones.
The nailing fin is fastened per the manufacturer's schedule, not "close enough" spacing.
WRB (house wrap) is integrated over the fin in the correct lap order, and any seams are taped.
Interior and exterior sealant beads are applied at the specified points only — sealing every possible gap actually traps moisture rather than stopping it.

Skip the sill pan, reverse the flashing lap order, or over-seal the wrong spots, and the window can look perfect for years while water quietly works its way into the wall assembly behind it.

Frame Material: What Holds Up Near the Water

Frame Material	Coastal/Salt Air Performance	Maintenance	Typical Fit for Marietta
Vinyl	Doesn't corrode; UV-stable versions hold color well	Low — occasional cleaning	Strong value option for most new construction
Fiberglass	Excellent — dimensionally stable, resists moisture and salt exposure	Low	Good upgrade for wind-exposed or waterfront-facing openings
Wood (unclad)	Requires diligent finish maintenance to resist moisture and rot near salt air	High	Only for owners committed to regular refinishing
Aluminum-clad wood	Good if cladding and flashing are detailed correctly; watch fastener corrosion	Moderate	Common on higher-end builds; detailing matters more here than inland

We don't push one brand or material as universally "best" — the right call depends on budget, the home's design, and how exposed a given elevation is to wind and salt spray. What we won't do is install a frame material into an exposed opening without discussing the maintenance trade-off up front, because a surprise five years later isn't fair to the homeowner.

Glass and Hardware Notes

Low-E glazing is standard on new construction now and helps with both summer heat gain and winter heat loss — a reasonable default for this climate rather than an upsell. For hardware — hinges, locks, cranks — we look for corrosion-resistant finishes on any elevation facing open water or prevailing wind, since standard-grade hardware is where salt exposure shows up first.

How Flashing Ties Into Your Siding

New-construction windows and siding are not separate trades that happen to meet at the same wall — the window flashing has to be planned around whatever siding is going on next, and vice versa. Fiber cement, lap siding, and board-and-batten all have slightly different trim and flashing reveal requirements at window openings. When the same crew handles both the window integration and the siding, there's no handoff where details get lost between two contractors pointing fingers at each other later. That coordination is one of the biggest practical advantages of hiring locally for both scopes rather than splitting them.

Our Process for a Marietta New-Construction Job

Step	What Happens
1. Site walk & plan review	We review the framing plan or actual rough openings, note wind exposure by elevation, and flag any details worth discussing before ordering.
2. Product selection	We go over frame material, glazing, and hardware options against your budget and the site's exposure — no pressure toward the priciest option.
3. Flashing & sill pan install	Sill pans and flashing membrane go in per manufacturer instructions and current best practice, in the correct shingle-lap order.
4. Window set & fastening	Windows are set square and plumb, fastened per spec, and checked for smooth operation before moving on.
5. WRB integration	House wrap is lapped and taped over the flashing so the whole envelope works as one system, ready for siding.
6. Final check	We walk every opening before the crew moves to siding, since it's far easier to fix a flashing detail now than after the wall is closed up.

Why a Crew That Already Works Marietta Matters

Wind exposure, salt air, and rain direction change house to house even within a small area like Marietta, depending on how close a lot sits to open water and which way it faces. A crew that already works this part of Semiahmoo has a feel for which elevations need the extra attention and which openings are more sheltered — that judgment comes from experience on this specific stretch of coastline, not from a general new-construction checklist written for a drier climate. We also know how our local building department expects flashing and window details documented for inspection, which keeps the framing-to-siding schedule moving instead of stalling on a callback.

Checklist: What to Confirm Before Windows Go In

Rough openings are checked square and level before windows arrive on site
Sill pans are specified for every opening, not just ones on exposed elevations
Flashing sequence is confirmed in writing: sill, then jambs, then head, properly lapped
Frame material and hardware finish are matched to each elevation's wind/salt exposure
WRB integration and siding trim details are planned together, not handled by separate crews with no coordination
Fastening schedule follows the window manufacturer's specification, not a generic default

Maintenance After Installation

A correctly installed new-construction window in this climate still benefits from basic upkeep: rinsing salt residue off frames and hardware a couple times a year, keeping gutters and downspouts clear so runoff doesn't sheet down across window heads, and checking exterior sealant beads periodically since sealant is a wear item, not a permanent fix. None of this is heavy maintenance — it's the difference between a window that looks and operates like new at year ten versus one that starts showing corrosion or sticking hardware early.

Get a Free, No-Pressure Estimate

If you're framing new construction or an addition in Marietta and want windows installed with this climate actually factored in — not just to a generic spec sheet — we're happy to walk the site, look at your plans, and give you a straightforward estimate. Use the form below to get started.