Lynden Why We Only Install One Siding Brand
Most siding contractors will install whatever a homeowner asks for — vinyl, engineered wood, fiber cement, cedar. We stopped doing that years ago. Every crew on our team installs James Hardie fiber cement siding and nothing else. That's not a marketing angle; it's a standard we hold because we've seen what the Whatcom County climate does to the alternatives over ten, fifteen, twenty years, and we got tired of watching good work get undone by material choices, not workmanship.
This page explains what fiber cement actually is, why the other common products fall short for this specific climate, and what you should expect from a correctly installed Hardie system. No hype, no invented numbers — just the trade-offs as we see them after years of tearing old siding off Lynden and Nooksack Valley homes and seeing exactly what survived and what didn't.
What Fiber Cement Actually Is
James Hardie siding is made from a mix of Portland cement, sand, and cellulose fiber, pressed and cured into dense, dimensionally stable boards. It's not plastic (like vinyl), and it's not wood or a wood composite (like LP SmartSide or engineered panel products). That distinction matters more than most homeowners realize, because it changes how the material responds to the two things that do the most damage to siding here: sustained moisture and temperature swings.
Fiber cement doesn't expand and contract the way wood-based products do when they take on moisture. It doesn't rot, and it's not a food source for the fungi that cause the black and green staining you see on north-facing walls and shaded siding across this region during the long wet season. It's also non-combustible, which matters for wildfire-adjacent insurance considerations even this far west.
How the HZ5 Product Line Fits This Climate
Hardie engineers its boards in climate-specific formulations called HZ (HardieZone) products. HZ5 is the formulation built for the wetter, more temperate parts of the country — which includes western Washington. It's engineered around moisture and freeze-thaw cycling rather than the extreme heat formulations used in the Southwest. When we quote a Lynden home, HZ5 is what goes on the wall. That's not an upsell; it's the correct product for this zip code, and it's part of why "James Hardie siding" isn't a single product — it's a system that has to be specified correctly.
The Products We Chose Not to Install, and Why
We're not going to tell you these products are junk. Vinyl sells millions of square feet a year for real reasons, and engineered wood siding has genuine fans. Here's the honest version of why we don't put them on Whatcom County homes anymore.
Vinyl Siding
Vinyl is inexpensive, low-maintenance in the sense that it never needs painting, and quick to install. The trade-offs: it's a thin plastic skin that flexes and can crack in cold snaps, fades unevenly in UV exposure over the years, and — critically for this region — it's installed with expansion gaps that rely on a continuous, unbroken water plane behind it to actually keep a house dry. Any breach in that housewrap, and vinyl does very little to stop bulk water from tracking behind it during a driving Pacific Northwest rain event. It also has no real fire resistance and a shorter realistic service life than fiber cement.
LP SmartSide and Engineered Wood Panels
Engineered wood siding (strand-based products bonded with resin) is a legitimate step up from raw wood in factory consistency, and it takes paint well. The issue is what happens at cut edges, fastener penetrations, and any point where the factory-sealed surface gets breached during installation — those points can wick moisture into the wood strand core. In a climate with our rain totals and a genuine moss season, sealing every field cut and butt joint perfectly, on every home, every time, isn't a bet we're willing to make with a client's siding.
Primed Spruce, Cedar, and Cemplank/Allura Alternatives
Solid wood siding — cedar especially — still has real appeal for its look, and we understand why people want it. But raw or primed wood needs a maintenance commitment (recoating, caulking, moisture checks) that most homeowners underestimate until they're a decade in with a paint job failing early. Cemplank and Allura are also fiber cement, and mechanically similar to Hardie — but we standardized on one manufacturer so our crews master one installation spec, one flashing detail, one warranty process, rather than splitting expertise across product lines.
Factory-Applied Finish vs. Field Painting
One of the most underrated parts of the Hardie system is ColorPlus Technology — the factory-applied finish baked onto the board before it ever reaches the jobsite. Field-painted siding (whether it's raw fiber cement, primed wood, or engineered panel product) depends entirely on weather conditions during installation and the quality of that specific paint job. ColorPlus finish is cured in a controlled environment, resists fading and chipping better than field-applied coatings, and comes backed by its own separate finish warranty.
In a region where you often get a narrow weather window to paint exterior work between rain systems, factory-finished siding removes an entire point of failure from the project.
Comparing the Common Siding Materials
| Material | Moisture Tolerance | Fire Rating | Maintenance Burden | Typical Finish Life |
|---|---|---|---|---|
| James Hardie Fiber Cement | Excellent | Non-combustible | Low | Long — factory ColorPlus finish |
| Vinyl | Fair — relies on housewrap | Combustible, melts under heat | Low | Moderate — fades, can't be repainted easily |
| Engineered Wood (LP-type) | Fair — vulnerable at cut edges | Combustible | Moderate | Moderate — depends on seal integrity |
| Cedar / Primed Wood | Good if maintained | Combustible | High — regular recoating | Short-moderate without upkeep |
What Correct Hardie Installation Actually Requires
Fiber cement siding fails prematurely almost exclusively because of installation mistakes, not the material itself. This is the part homeowners rarely get told, and it's the reason "who installs it" matters as much as "what brand you chose."
- Minimum clearance from grade, decks, and roof lines to prevent wicking
- Correct fastener type, spacing, and depth — over-driven nails crack boards and void warranty coverage
- Proper water-resistive barrier and flashing at every window, door, and penetration
- Blind-nailing or engineered joints at butt seams rather than exposed, unsealed gaps
- Factory-cut or properly sealed field cuts to protect the core material
- Correct caulking at trim transitions using a product compatible with ColorPlus finish
- Manufacturer-specified starter strips and rainscreen gap where the wall assembly calls for it
We install to Hardie's published specifications on every job, which is also what keeps a warranty claim valid if one is ever needed.
The Warranty, in Plain Terms
James Hardie backs its fiber cement products with a non-prorated, transferable limited warranty — meaning it doesn't lose value over time the way some prorated material warranties do, and it can pass to a new owner if the home sells. ColorPlus finish carries its own separate finish warranty covering fading and chipping of the factory coating. Warranty coverage depends on installation meeting Hardie's specifications, which is one more reason installation quality and product choice aren't separate conversations — they're the same conversation.
Why This Matters More in Whatcom County
Lynden sits in a corner of the state where the siding on a house does real work. Winters bring long stretches of sustained rain rather than isolated storms, which means siding here doesn't just get wet — it stays wet for days at a time. Proximity to Bellingham Bay and the Salish Sea adds a salt-air component that accelerates corrosion on fasteners and finishes that aren't rated for it. And the shaded, damp conditions common across Whatcom County produce a moss and algae season that's longer than what siding manufacturers assume in their general product testing.
Put those three things together — sustained rain, salt air, and moss pressure — and you get a climate that exposes weak points in siding systems faster than drier regions ever would. That combination is a large part of why we settled on one non-combustible, factory-finished, moisture-stable product rather than offering a menu of options with very different long-term outcomes.
What to Ask Before You Hire Anyone for Siding Work
- Are they installing to the manufacturer's written specification, or their own shortcut version?
- Do they carry proper licensing and insurance specific to Washington siding work?
- Will they explain flashing and water-management details, not just the visible finish?
- Do they register the manufacturer warranty on your behalf?
- Can they explain why they recommend a specific product line for your home's exposure?
If you're weighing siding options for a Lynden home, we're glad to walk through what we'd recommend for your specific exposure and give you a straightforward, no-pressure estimate — no obligation, just a clear look at what the job actually involves.