What's actually different about new-construction windows compared to replacement windows?

New-construction windows have a nailing flange that gets integrated into the wall's weather-resistive barrier and flashing before siding goes on, while replacement windows fit into an existing opening without disturbing the exterior finish. The installation sequence and flashing detail are far more involved on a new build because that flange has to be worked into the drainage plane correctly the first time.

What should I ask a contractor before they install windows on my new build in Peace Arch?

Ask specifically how they flash the sill, what order they integrate the window with the house wrap, and whether they use upgraded corrosion-resistant fasteners given the proximity to open water. A contractor who can answer those questions in detail, rather than in generalities, is one who actually understands coastal new-construction work rather than just production installs.

Do you install a specific window brand, or can I choose what goes into my new build?

We work with several window manufacturers and can install what your builder or plans specify, or help you choose based on frame material, glass package, and budget. Our focus is on getting the installation detail right regardless of brand, since flashing and sequencing errors cause far more long-term problems than the window unit itself.

What glass package or U-factor actually makes sense for a marine climate like Blaine's?

A lower U-factor helps retain heat through the long, cool, wet stretch that dominates the calendar here, and a warm-edge spacer system helps reduce interior condensation in bathrooms, kitchens, and other moisture-heavy rooms. Solar heat gain coefficient matters less here than in sunnier inland climates, so we weigh it against each wall's orientation rather than applying one spec everywhere.

Does Peace Arch's location near the water and the border actually change how windows should be installed?

Yes — homes closer to open water see more salt-laden air and more driving rain pushed sideways by wind, which affects fastener and hardware choices as well as how carefully flashing needs to shed water rather than trap it. The border crossing itself doesn't change the construction approach, but the neighborhood's exposure to Semiahmoo Bay and the Strait of Georgia does.

New-Construction Windows for Peace Arch Homes, Blaine WA

Building New in Peace Arch: Why Window Installation Timing Matters

Peace Arch sits close enough to the water and to the border crossing that homes here take a steady beating from moisture — salt-laden air off the bay, wind-driven rain rolling in off the Strait of Georgia, and a wet season that runs long even by Whatcom County standards. If you're building new in this neighborhood, the window installation isn't a standalone task you bolt on later. It's tied directly into the framing, the weather-resistive barrier, and the siding sequence. Get that sequence wrong and you won't see the consequences for a year or two — by which time water has already found its way behind the cladding.

New-construction windows are a different job than replacement windows. A replacement window gets set into an existing opening, often without disturbing the exterior finish. A new-construction window has a nailing flange that gets integrated directly into the wall assembly — the house wrap, the flashing, the sheathing — before siding or trim ever goes on. That flange is either your best friend or your biggest liability, depending on how it's flashed. On a home exposed to Peace Arch's weather, we don't treat that step casually.

What This Climate Actually Demands From a Window Install

It helps to be specific about what "coastal exposure" means for a builder rather than just a marketing phrase. In Peace Arch, three conditions show up again and again:

Salt air corrosion — fasteners, hinges, and unprotected metal components degrade faster near the water than they would inland.
Driving rain — wind-blown rain doesn't fall straight down; it hits window units at an angle and pushes water sideways and upward at flanges and sill joints.
Extended damp season — long stretches of moist air and shade encourage moss and mildew growth on anything that doesn't shed water and dry out between rains.

None of this means new-construction windows in Peace Arch need to be exotic or overbuilt. It means the flashing details, fastener choices, and drainage paths need to be right the first time, because this is the one part of the build where redoing the work later means tearing into finished siding.

The Install Sequence That Actually Keeps Water Out

Sill Pan Flashing Comes First

Before a window ever sits in the rough opening, the sill needs a sloped, sealed pan — not just a bead of caulk. A proper sill pan directs any water that gets past the window (and some always will, eventually) back outside the wall assembly instead of down into the framing. This is the single most common shortcut we see skipped on production builds, and it's the one that causes the most rot down the line.

Shingle-Lap Order With the Weather-Resistive Barrier

The window flange has to integrate with the WRB in the correct overlap order — sill flashing first, then the window, then jamb flashing over the sides of the flange, then head flashing over the top, lapped so every layer sheds water onto the layer below it, like shingles on a roof. Reverse that order anywhere and you've built a pocket that collects water instead of shedding it.

Head Flashing and Drip Caps

Given how much driving rain this area sees, we don't skip a proper head flashing or drip cap above each window, even under covered eaves. Wind can push rain sideways and upward under a soffit far more easily than most homeowners expect.

Fastening and Shimming for Drainage

Windows need to be shimmed square and plumb without over-driving fasteners, which can bow the frame and compromise the seal around the sash. We also leave the designed drainage paths at the sill clear — weep holes and drainage gaps are there for a reason, and they're easy to accidentally block with insulation or sealant during installation.

Material and Hardware Choices That Hold Up Near the Water

Not every window product is built the same way, and in a salt-air environment the difference shows up in five to ten years, not on day one. Here's how the common frame materials compare for a project like this:

Frame Material	Salt Air / Moisture Behavior	Maintenance	Typical Cost Tier
Vinyl	Won't corrode; UV and heat can affect long-term stability	Low — occasional cleaning	Lower
Fiberglass	Excellent resistance to moisture and salt exposure; stable dimensionally	Low	Mid to upper
Aluminum-clad wood	Good exterior protection, but any breach in the cladding exposes wood to rot	Moderate — depends on cladding integrity	Upper
Bare aluminum	Prone to pitting and corrosion in salt air over time without upgraded coatings	Higher	Varies

We also spec corrosion-resistant fasteners and hardware — stainless or coated screws rather than standard galvanized — anywhere a window is within a few blocks of open water or exposed to prevailing wind off the bay. It's a small cost difference at the framing stage and a real difference in how the hardware looks and functions a decade out.

Glass Packages and Frame Performance for a Marine Climate

Whatcom County's marine climate is mild compared to inland Washington, but it's persistently damp, which changes what matters in a glass package:

U-factor matters for keeping heat in during the cool, wet months that dominate the calendar here.
Solar heat gain coefficient (SHGC) is less critical than in sunnier climates, but still worth balancing against window orientation, especially on south- and west-facing walls.
Condensation resistance is worth asking about directly — homes with a lot of interior moisture (bathrooms, kitchens, laundry areas) benefit from a warmer edge-of-glass spacer system, which cuts down on interior condensation and the mildew that follows it.

We'll walk through glass package options against your home's orientation and layout rather than defaulting to one spec across every opening — a window facing prevailing wind and rain off the water doesn't need the same treatment as one tucked under deep eaves on a sheltered wall.

Coordinating With Your Builder or General Contractor

New-construction window work happens on someone else's schedule — the framer's, the GC's, the siding crew's. Delays or sequencing errors on our end can hold up an entire build. We work directly with the builder to confirm:

Rough opening sizes match approved window schedules before units arrive on site
WRB installation and window flashing happen in the correct order, not whichever crew shows up first
Flashing details are inspected and photographed before siding closes them in for good
Any change orders (size, style, or glass package swaps) get confirmed in writing before install day

On a lot in Peace Arch, we also plan install timing around weather windows where we can — driving rain during an open flashing sequence is exactly the scenario the sill pan and shingle-lap order are designed to protect against, but there's no reason to test that when we can wait for a drier stretch.

Common Mistakes We See in New-Construction Window Installs

Most of the water intrusion problems we get called out to diagnose in newer homes trace back to a handful of repeat issues:

Caulk used as a substitute for proper sill pan flashing
WRB and flashing layers overlapped in the wrong order, creating a trap instead of a drain path
Over-driven fasteners bowing the frame and breaking the factory seal
Drainage weeps and gaps sealed shut or packed with insulation
Standard fasteners and hardware used within sight of open water, leading to early corrosion and staining

Every one of these is avoidable, and every one of them is far cheaper to get right at framing stage than to correct after siding, trim, and interior finish are complete.

Our Process on New-Construction Projects in Peace Arch

We approach every new build the same structured way, adjusted for the specific lot and orientation:

Review the window schedule and rough openings against approved plans before ordering
Confirm frame material and glass package choices against the home's orientation and exposure to wind and rain
Install sill pan flashing, then windows, then jamb and head flashing in correct shingle-lap order with the WRB
Verify square, plumb, and proper shim placement without over-fastening
Confirm drainage paths and weep holes remain clear before sign-off
Document flashing details before the siding crew closes the wall

That documentation step matters more than it sounds — it gives the homeowner and builder a record of what's behind the siding, which is useful for warranty purposes and for any future work on the home.

A Quick Checklist Before Your Windows Go In

Has the window schedule been double-checked against actual rough openings?
Is there a sloped sill pan detail specified for every opening, not just the exposed ones?
Are fasteners and hardware upgraded for proximity to open water?
Has the glass package been matched to each wall's orientation rather than applied uniformly?
Will flashing be photographed before siding closes the wall assembly?

If you're building or finishing a new home in Peace Arch and want a crew that treats window installation as part of the water-management system rather than a standalone task, we're happy to walk your plans and framing schedule with you. Reach out for a free, no-pressure estimate — the form below gets you started.