Birch Bay Siding Vinyl Siding Isn't a Bad Product — It's a Bad Fit for This Coastline
We get asked about vinyl siding often enough that we think homeowners deserve a straight answer instead of a sales pitch. Vinyl is inexpensive, it's fast to install, and for a lot of the country it does a perfectly adequate job. We're not going to tell you vinyl siding is junk, because that isn't true and it isn't fair to the manufacturers who make it. What we will tell you is why, after years of working on homes along the water in Whatcom County, we stopped installing it — and why we now put James Hardie fiber cement on every home we side.
Birch Bay sits right on the water, which means every home here deals with a combination most siding products were never engineered for: near-constant salt-laden air, long stretches of driving rain off the Strait of Georgia, and a wet, shaded moss season that can run half the year. Vinyl siding was designed for general-purpose use across the country, not for this specific combination of conditions. That gap between "designed for" and "installed in" is the whole reason for this page.
What Vinyl Siding Actually Gets Right
Before we get into the trade-offs, credit where it's due:
- Lower material and installation cost than most alternatives
- Never needs painting — the color is through the material
- Lightweight, which speeds up installation on straightforward walls
- Won't rot, since it contains no wood fiber
- Wide availability of colors and profiles, including horizontal lap and shingle-look panels
If you're on a tight budget and your home is in a sheltered, inland location, vinyl can be a reasonable choice. Our objection isn't to the product in general — it's to what happens when that product meets a Birch Bay winter.
How Salt Air Works Against Vinyl
Vinyl siding is a plastic — typically PVC — formulated with UV inhibitors and colorants that hold up reasonably well in average conditions. Salt air changes that equation in two ways. First, airborne salt settles into the textured surface of vinyl panels and, combined with moisture, accelerates the chalking and fading that all vinyl eventually experiences. Second, salt is corrosive to the fasteners, trim coil, and flashing details that vinyl systems depend on. Vinyl siding is installed with a "hung, not fastened tight" method — panels have to be able to expand and contract with temperature, so they hang loosely on nail slots. That loose-hang design is fine in dry climates. On a property exposed to salt spray, it becomes a place for corrosive moisture to sit against metal fasteners and trim for months at a time.
We're not aware of solid published failure-rate data specific to coastal Whatcom County, so we won't invent a number. What we can tell you from direct field experience is that vinyl siding installed within a half-mile or so of the water shows fading, brittleness, and fastener staining noticeably sooner than the same product installed a few miles inland — and that pattern is consistent enough that it shaped how we run our business.
Brittleness in Cold, Wind-Driven Conditions
Vinyl becomes more brittle as temperatures drop, and Birch Bay's winter storms bring wind-driven debris and occasional hard freezes. Cold, brittle vinyl cracks and shatters more easily on impact — from a wind-thrown branch, a ladder brush, or even aggressive pressure washing. A cracked panel isn't a cosmetic footnote; it's an open path for water directly behind the cladding.
Driving Rain and the Moisture Management Problem
Vinyl siding is not a waterproof envelope on its own — it's designed as a water-shedding rain screen that relies on an intact weather-resistive barrier underneath to do the real work of keeping a wall dry. That's a legitimate system when it's installed correctly and the barrier stays intact. The problem is that vinyl's loose-hung panels, overlapping J-channels, and multiple penetration points (outlets, hose bibs, light fixtures) create a lot of seams where wind-driven rain can be pushed up and behind the panel, especially during the kind of sideways storms that come off the water here.
Once moisture gets behind vinyl, there's very little drying capacity in the panel itself — it's plastic, so it doesn't absorb or release moisture. Everything depends on the water finding its way back out through weep holes at the bottom of each course or evaporating off the housewrap. In a climate with long stretches of damp weather and short drying windows between storms, that margin gets thin. We've opened up enough vinyl-clad walls on remodels to see sheathing damage that had been quietly developing for years behind siding that looked fine from the curb.
Moss, Algae, and the Long Wet Season
Whatcom County's extended damp season is hard on any exterior surface, but vinyl has a specific weakness: its textured, low-gloss finish gives moss spores and algae something to grip, and because vinyl doesn't breathe or dry quickly, shaded and north-facing walls stay damp longer than they would with a more vapor-open material. Homeowners end up power-washing or soft-washing vinyl siding more often than they expected when they bought it, and repeated pressure washing is exactly the kind of stress that cracks cold, brittle panels or forces water behind seams.
The Installation-Sensitivity Problem
Vinyl siding's performance is unusually dependent on installer discipline. It has to be fastened loosely enough to expand and contract, but tightly enough to stay put in wind — and that balance is easy to get wrong. Over-driven nails, panels hung too tight, missing or damaged weep holes, and poorly flashed penetrations are common defects that don't show up as problems until a few years in, when the panel has already buckled, bowed, or let water behind it. We're not saying every vinyl installation is done poorly — plenty of installers do it right. We're saying the margin for error is smaller than most homeowners realize, and the failure mode is invisible until it isn't.
What We Install Instead, and Why
We standardized on James Hardie fiber cement siding for every home we side, including here in Birch Bay. It's not the cheapest option on the table, and we're upfront about that. Here's the reasoning:
| Factor | Vinyl Siding | James Hardie Fiber Cement |
|---|---|---|
| Core material | PVC plastic | Cement, sand, and cellulose fiber |
| Fire behavior | Combustible plastic | Non-combustible |
| Salt air / coastal exposure | Fades, chalks, and brittles faster near water | Engineered climate-specific HZ formulations for moisture and salt exposure |
| Cold-weather impact resistance | Becomes brittle, cracks on impact | Holds up to impact without the same cold-brittleness issue |
| Finish | Color is in the plastic; fades and chalks over time | Factory-applied ColorPlus finish, backed by its own warranty |
| Moisture behavior if compromised | Little drying capacity, relies entirely on barrier behind it | More dimensionally stable, less prone to trapped-moisture failure when installed correctly |
| Upfront cost | Lower | Higher |
| Typical service life when installed to spec | Shorter in harsh coastal exposure | Long service life, backed by a strong transferable warranty |
Hardie's HZ5 product line, in particular, is engineered for regions that see the freeze-thaw cycling, moisture, and wind-driven rain typical of the Pacific Northwest coast. It's a cement-based product, so it doesn't chalk, fade from UV the way plastic does, or become brittle in cold weather. It also carries a fire-resistance profile that vinyl, as a plastic product, simply cannot match — a real consideration during dry summer stretches even in a generally wet county like ours.
What We'd Ask You to Consider Before Choosing Vinyl
- How close is the home to the water, and how much direct salt exposure does it get?
- How much shade does the home have, and how long do walls stay damp after a storm?
- Are you planning to stay in the home long-term, or is this a shorter-hold investment?
- What does the installer's warranty actually cover if a panel fades, cracks, or blows off?
- Is the quoted price factoring in proper flashing, weep-hole detailing, and correct fastening — or just the cheapest panel install?
If your answers point toward a sheltered, inland property and a shorter time horizon, vinyl may genuinely make sense for your situation, and we'd rather tell you that honestly than talk you into something you don't need. If your home sits closer to Birch Bay's shoreline or takes the brunt of winter storms, we think the math tips clearly toward a product built for that exposure.
Our Bottom Line
We didn't stop installing vinyl siding because we think it's a scam or because we're chasing a bigger ticket. We stopped because we spent enough years watching how it performs specifically on this coastline — the salt air, the driving rain, the moss season — and decided we'd rather stand behind one product we trust than offer a cheaper option we'd have reservations about recommending to our own families. James Hardie fiber cement costs more upfront, but it's built for exactly the conditions Birch Bay throws at a house, and it's what we're willing to put our name on.
If you're weighing your siding options, we're happy to walk your property, talk through what we see, and give you an honest, no-pressure estimate — no hard sell, just a straight assessment of what your home actually needs.