Birch Bay Vinyl Siding Isn't a Bad Product — It's the Wrong Product Here
We get asked at least once a month why we don't carry vinyl siding. It's a fair question. Vinyl is the most common siding material installed in the U.S., it's inexpensive, it comes in dozens of colors, and for a lot of climates it does a perfectly adequate job for a couple of decades. We're not going to stand here and tell homeowners that vinyl is garbage, because it isn't. What we will tell you, honestly, is why we made the call years ago to stop installing it on homes in Birch Bay and the rest of Whatcom County, and why every home we side today gets James Hardie fiber cement instead.
This isn't a marketing angle. It's a decision built around what actually happens to vinyl siding on a home that sits a few blocks from Semiahmoo Bay or Drayton Harbor, gets hit with driving rain off the Strait, and spends four or five months a year damp enough to grow moss on the north wall. Vinyl's weaknesses aren't hypothetical in this climate — they're the exact conditions Birch Bay throws at a house all year.
What Vinyl Siding Gets Right
Before we get into why we don't install it, it's worth being straight about what vinyl does well, because pretending otherwise would be dishonest:
- Low material cost and fast installation, which keeps upfront project pricing down
- No painting required, and a wide range of factory colors
- Won't rot, and doesn't feed insects the way untreated wood trim can
- Widely available, with installers in nearly every market who know the product
For a lot of houses in drier, more temperature-stable parts of the country, that combination is a reasonable value proposition. Birch Bay isn't that climate, and that's where the calculation changes.
Why Birch Bay's Climate Changes the Math
Salt Air and Coastal Corrosion
Birch Bay sits directly on saltwater. Salt-laden air doesn't just affect metal fasteners and flashing — it accelerates the breakdown of the plasticizers in vinyl siding, the chemical additives that keep the material flexible. Over years of salt exposure combined with UV, vinyl in coastal zones tends to become brittle noticeably faster than the same product installed 20 miles inland. Brittle vinyl cracks at the corners, at nail slots, and around penetrations — exactly the spots where water intrusion matters most.
Driving Rain and Water Management
Vinyl siding is not a waterproof cladding system. It's designed to be a rain screen that sheds bulk water while allowing some moisture to pass behind it into a drainage plane — which is fine, as long as that drainage plane and the wall assembly behind it are doing their job. Whatcom County's driving rain, pushed sideways by wind off the water, finds every lapped seam and unsealed J-channel. Vinyl's loose-hung, interlocking panel design tolerates a certain amount of wind-driven water by design, but it depends heavily on correct lap orientation, properly caulked penetrations, and a housewrap system in good condition. When any one of those is off — which we see often on older installs — water tracks behind the panels instead of off them.
Moss Season and Prolonged Moisture
Western Whatcom County's moss season isn't just a roof problem. North- and west-facing vinyl siding that stays shaded and damp for weeks at a stretch grows moss and algae in the panel laps and J-channels, where it's difficult to reach and impossible to fully clean without risking damage to the material. That sustained moisture also keeps the wall assembly behind the siding wetter for longer, which is the condition that eventually leads to sheathing and framing problems — the kind of damage you don't see until you pull the siding off.
The Trade-offs We See in the Field
Heat and Cold Distortion
Vinyl expands and contracts more than fiber cement with temperature swings. Birch Bay doesn't see extreme heat often, but on the days it does — combined with dark vinyl colors that absorb more heat — panels can warp, buckle, or pull loose from their nailing if they weren't hung with the correct expansion gap. Cold snaps have the opposite effect: cold vinyl becomes stiff and far more prone to cracking on impact.
Impact and Wind Damage
Vinyl is a relatively thin, flexible material. Hail, a thrown rock from a mower, or a ladder brushing against a wall can crack a panel outright. Wind gusts strong enough to get under a bottom edge can pop panels off their locks entirely — something we see after winter storms roll through from the water. Fiber cement, being rigid and considerably heavier per square foot, resists both of these failure modes far better.
Vinyl vs. Fiber Cement: A Side-by-Side Look
| Factor | Vinyl Siding | James Hardie Fiber Cement |
|---|---|---|
| Combustibility | Melts/deforms in heat, contributes fuel load | Non-combustible core material |
| Coastal salt exposure | Plasticizers degrade faster, becomes brittle | Cementitious material unaffected by salt |
| Moisture/moss resistance | Traps moisture and algae in laps/channels | Engineered HZ formulations for wet climates |
| Impact resistance | Cracks under impact, especially when cold | Rigid, resists denting and cracking |
| Finish | Color molded through material, fades with UV | Factory-baked ColorPlus finish, resists fading |
| Typical service life (this climate) | 15-25 years before visible degradation | 30+ years with correct installation and care |
| Warranty structure | Prorated, often void after transfer | Transferable, non-prorated on many product lines |
None of this means every vinyl-sided home in Birch Bay is failing. Plenty hold up reasonably well for a decade or two. But when we're the ones putting our name behind an installation, we'd rather install a product engineered for exactly these conditions than one that's tolerating them.
Installation Sensitivity Nobody Talks About
A lot of vinyl's real-world problems trace back to installation, not the material itself. Vinyl has to be hung loose enough to expand and contract with temperature, nailed in the center of the slot rather than tight, and lapped in the correct direction relative to prevailing wind and rain. It sounds simple, but it's also one of the most commonly rushed installations in residential construction because it goes up fast and looks fine on day one regardless of whether it was done correctly. The consequences — buckling, blow-off, water intrusion behind the panels — usually don't show up for a few years, well after the installer has moved on to the next job. Fiber cement has its own installation requirements around fastening, clearances, and caulking, but errors tend to be more visibly obvious at the time of install, which keeps crews more honest about doing it right.
Why We Standardized on James Hardie
We made the decision to install only James Hardie fiber cement products — no vinyl, no LP SmartSide, no cedar or primed spruce. It's a narrower product lineup than most siding contractors offer, and that's intentional. James Hardie's HZ10 formulation is engineered specifically for climates like ours — freeze-thaw cycling, sustained damp weather, and coastal exposure. The ColorPlus factory finish is baked on under controlled conditions rather than mixed through the material or field-painted, which means better fade and chip resistance over the long run. It's non-combustible, which matters in a region where wildfire smoke and ember exposure have become a bigger part of the conversation even out here near the water. And Hardie backs its products with a transferable, non-prorated warranty structure that holds up better for homeowners who sell within the ownership window.
Standardizing on one manufacturer also means our crews install this product constantly rather than switching between three or four systems. That repetition is where installation quality actually comes from.
What This Means for Your Home
If you're currently deciding what to re-side with, here's a practical way to think it through rather than just taking our word for it:
- Ask how close your home sits to open water or a shoreline, and whether the wall faces prevailing wind and rain
- Check whether your home's north or west elevations already show moss or algae staining on existing siding or trim
- Get the manufacturer's actual warranty document, not just the sales sheet, and read what voids it
- Ask any contractor you're considering why they carry the products they carry — and why they don't carry others
- Weigh upfront cost against the cost of a second re-side in 15-20 years versus one install that's engineered to last longer
If vinyl still makes sense for your situation, we'll say so — we'd rather lose the job than install something we don't believe will hold up on your specific house.
Let's Look at Your Home
Every home in Birch Bay faces a slightly different mix of sun, wind, and moisture depending on elevation and how close it sits to the water. We're happy to walk your property, look at your current siding condition, and give you a straight answer about what we'd recommend and why. If you'd like a free, no-pressure estimate, use the form below to get started.