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

New-construction windows have a nailing fin around the frame and are fastened directly to the wall sheathing during framing, before siding goes on. Replacement windows are built to fit into an existing finished opening without disturbing the surrounding siding or trim. They're different products installed with different methods, so it matters which one your project actually calls for.

What should I ask a contractor before they install windows on my new Ballard build?

Ask how they handle sill pan and jamb flashing, whether they follow the window manufacturer's fastening schedule, and how they sequence the work with your WRB and siding crews. Ask if they'll walk the rough openings with your framer before windows arrive. A contractor who can answer these specifically, rather than in general terms, has done this enough times to get it right.

Do you install a specific window brand, or work with what our architect or builder specced?

We generally work with whatever window line your builder, architect, or budget has already specified, since new-construction window choice is usually locked in earlier in the design process. Where we add value is flagging when a specified product needs particular attention in the install, such as a fastener grade suited to salt air exposure.

What is sill pan flashing and does every new-construction window need one?

A sill pan is a sloped, sealed flashing piece at the bottom of the rough opening that catches any water getting past the window and channels it back outside instead of onto the framing. We consider it standard practice on every new-construction install in this climate, not an upgrade, since Ballard's rain load gives water plenty of chances to get past a window over the years.

How does being close to Puget Sound in Ballard affect window choices?

Proximity to Salmon Bay and the Sound means more airborne salt, which accelerates corrosion on lower-grade fasteners and hardware finishes faster than it would further inland in King County. It pushes us toward frame materials and hardware grades that hold up to that exposure, and toward flashing details that account for the driving rain that comes off the water during winter storms.

Ballard New-Construction Window Installation

Building New in Ballard? The Windows Are Where Most Problems Start

If you're framing a new home, an addition, or a spec build in Ballard, the windows are one of the few components that get installed exactly once and then get buried behind siding, trim, and interior finish for decades. There's no going back to fix a bad flashing detail after the drywall is up. A new-construction window install has to be right the first time, because Ballard's exposure to Puget Sound weather — salt-laden air off Salmon Bay and the Sound, driving rain that comes in sideways during winter storms, and a long moss season that keeps everything damp for months at a stretch — is not forgiving of shortcuts.

We work as a local crew on new builds and additions around Ballard and the rest of Seattle, coordinating directly with framers, siding crews, and GCs so the window install fits into the build sequence correctly instead of being treated as an afterthought.

New-Construction Windows vs. Replacement Windows: Not the Same Job

This page is specifically about new-construction windows, which is a different product and a different install method than replacing an existing window in a finished wall.

What makes it "new-construction"

The window has a nailing fin (flange) around the perimeter of the frame, made to be fastened directly to the wall sheathing.
It's installed during framing/sheathing, before siding and often before the weather-resistive barrier (WRB) is fully lapped over it.
Flashing is built in layers around the rough opening — there's no existing frame or trim to work around, which is an advantage if it's done in the right order.

Why the distinction matters to you

A new-construction install gives us full access to the rough opening, the sheathing, and the WRB — meaning there's no excuse for skipped steps. Done correctly, it's actually a more reliable, longer-lasting install than a retrofit. Done poorly, the mistakes get sealed behind the wall and don't surface as a leak until years later, often as hidden rot rather than a visible drip.

What Ballard's Climate Actually Does to a Window Install

Salt air and corrosion

Homes closer to Salmon Bay, the Ship Canal, and Puget Sound get airborne salt that accelerates corrosion on unprotected metal — fasteners, hinge hardware, and lesser-grade cladding finishes age faster here than they would ten miles inland. This is a material selection question as much as an installation one; we'll get to frame choices below.

Driving rain and wind-driven water

Seattle storms frequently push rain sideways rather than straight down, which means water tests every horizontal surface and every seam around a window opening, not just the top. A flashing system built only to shed water downward — instead of also resisting wind-driven water at the sides and sill — is a known weak point in this climate, and it's the single most common cause of moisture intrusion we see traced back to new-construction window installs.

A long, damp moss season

King County's wet season stretches long enough that any exterior surface prone to holding moisture will grow moss and organic buildup if it isn't detailing water away properly. On a window install, that shows up as sills and trim that stay damp, sealant that's asked to do more work than it should, and finish surfaces that need to actually shed water rather than just look finished on install day.

What a Correct New-Construction Window Install Involves

The window unit itself is only part of the job. The flashing sequence around it is what determines whether the wall stays dry for the next 30 years.

Rough opening check — verify the opening is square, plumb, and sized correctly before the window ever gets set. Errors here compound into shimming and sealant problems later.
Sill pan flashing — a sloped, sealed pan at the bottom of the rough opening that captures any water that gets past the window and directs it back outward, rather than letting it sit on the sill framing.
Back-dam and jamb flashing — flashing tape or membrane run up the jambs and integrated with the sill pan so there's a continuous drainage path, not just spot-taped corners.
Setting the window — shimmed level and plumb, fastened through the nailing fin per the manufacturer's schedule (not "however many nails looked right"), with the frame itself never relied on to carry structural load it wasn't designed for.
Head flashing integrated with the WRB — the top flashing has to shingle-lap correctly with the weather-resistive barrier above it, so water draining down the wall face is directed over the window, not behind it.
Sealant as backup, not primary defense — sealant fills gaps and backs up the flashing, but it should never be the only thing keeping water out. A wall that depends on caulk to stay dry is a wall that will eventually leak once that caulk ages, and in this climate that clock runs faster than most homeowners expect.

Choosing a Frame Material for a Ballard New Build

Frame material matters more here than it would in a drier, inland climate, mainly because of salt air exposure and the sheer number of wet months the frame has to perform in.

Frame Material	Behavior Near Salt Air & Rain	Maintenance Load	Common Fit
Vinyl	Doesn't corrode; performs consistently in moisture	Low — occasional cleaning	Budget-conscious builds, rentals, spec homes
Fiberglass	Excellent — dimensionally stable, resists moisture and salt exposure well	Low	Higher-end new builds, homes closer to the water
Aluminum-clad wood	Good exterior protection with a wood interior look, but clad seams and fasteners need quality hardware to resist salt corrosion	Moderate — interior wood may need periodic attention	Design-forward builds wanting a wood interior
Bare aluminum	Prone to corrosion and condensation in this climate unless thermally broken and well-finished	Higher	Less common in residential new construction here

We'll talk through these trade-offs against your budget and the architect's or builder's spec — our job is to flag when a chosen material needs extra attention in the install (fastener grade, finish protection) rather than to push you toward a specific brand.

Where We See New-Construction Installs Go Wrong

Sill pans skipped entirely, or improvised from leftover flashing tape without a real slope to drain water back out.
Fasteners driven through the nailing fin at random spacing instead of the manufacturer's specified schedule, which can affect both the water seal and the warranty.
WRB lapped incorrectly over the head flashing — installed in the wrong order so water is funneled behind the flashing instead of over it.
Sealant used to "fix" a flashing shortcut instead of the flashing being redone — this holds for a season or two, then fails.
Window openings framed slightly out of square, forcing installers to over-shim or force the unit, which stresses the frame and the seal over time.

None of these show up on a walkthrough the week the house is finished. They show up two, five, or ten winters later, which is exactly why the install sequence matters more than how the window looks on day one.

How We Work on Ballard New Builds

We coordinate directly with your builder or GC so window install happens at the right point in the sequence — after sheathing and WRB are ready for us, before siding closes everything up. On a new build, we're also happy to walk the rough openings with the framing crew before windows arrive, since catching an out-of-square opening early is a lot cheaper than correcting it after the fact. We document flashing steps as we go, which matters if your builder or lender requires proof of proper water management for inspection or warranty purposes.

A Homeowner or Builder's Checklist

Confirm whether your windows are new-construction (nailing fin) units, not replacement/retrofit units, before ordering.
Ask what sill pan flashing method will be used and how it ties into the jamb flashing.
Confirm the fastening schedule matches the window manufacturer's installation instructions (this affects warranty coverage).
Check that WRB and flashing sequencing follows correct shingle-lap order — head flashing under the WRB above it, not over.
Ask how frame material and hardware grade were chosen relative to your home's exposure to salt air and wind-driven rain.
Get the flashing details in writing or photographed before they're covered by siding.

Timing Your Window Install in the Build Schedule

New-construction windows go in at a specific point — sheathing and WRB need to be ready, but siding can't close in behind the windows yet. Scheduling this correctly avoids two costly problems: windows sitting exposed too long before siding protects the wall, or siding crews rushing the WRB just to hit a window install date. We work with your GC's schedule rather than around it, and we'll flag it directly if we think an opening isn't ready for windows yet — a short delay here is far cheaper than reopening a wall later.

Get a Straightforward Estimate

If you're framing a new home or addition in Ballard and want a window install crew that treats flashing and sequencing as seriously as the windows themselves, we're glad to walk your plans or your framed openings and give you a straightforward, no-pressure estimate using the form below.