Lynden Homeowners in Lynden and across Whatcom County often come to us with a quote in hand for Cemplank fiber cement siding, usually from a competing bid that came in a little cheaper than ours. That's a fair question to ask, and it deserves a straight answer instead of a sales pitch. This page explains what Cemplank is, what it does reasonably well, and why we made the decision years ago to install only James Hardie fiber cement on the homes we work on.
What Cemplank Actually Is
Cemplank is a fiber cement siding brand manufactured under the Etex/Plycem family of companies. Like James Hardie, it's made from a blend of cement, sand, and cellulose fiber, pressed and cured into planks, panels, and trim. On paper, the raw material science is similar to what Hardie uses — fiber cement as a category is genuinely a strong choice for the Pacific Northwest because it doesn't rot, doesn't attract insects, and holds up to the wet weather Whatcom County is known for far better than wood or vinyl.
We want to be upfront about that: Cemplank is not a bad product in the way vinyl or unprimed wood can be a bad product. It's a legitimate fiber cement siding, and in the right hands, installed to spec, it will perform. Our concerns aren't about the chemistry of the board. They're about everything that happens around the board — the product lineup, the finish system, the local support network, and the long-term ownership experience.
Where Cemplank Gets It Right
- Non-combustible core material, same as any true fiber cement product
- Resistant to moisture-driven rot, unlike wood or engineered wood siding
- Not a food source for insects or woodpeckers
- Available in lap, panel, and some trim profiles that cover most residential needs
- Competitive material pricing compared to premium fiber cement brands
If the only question were "is fiber cement the right category of siding for a house in Lynden," Cemplank would pass that test. The issue is what happens once you get past the category and into the specifics of the product line, the finish, and who stands behind it ten or twenty years down the road.
Our Concerns, Explained Honestly
Regional Engineering Depth
James Hardie engineers distinct product formulations for different climate zones — HZ5 for the colder, wetter regions like ours, HZ10 for hot, humid, or coastal-UV-heavy climates further south. That's not a marketing label; it changes how the board is formulated to handle freeze-thaw cycles, sustained moisture exposure, and the kind of driving rain that comes off the Salish Sea. Cemplank's lineup does not offer that same depth of climate-specific engineering. For a house that sits through a Whatcom County winter of near-constant drizzle followed by a damp, moss-friendly spring, that distinction matters more than it looks like on a spec sheet.
Factory Finish Consistency
Hardie's ColorPlus finish is a baked-on, multi-coat factory finish with a documented process and a specific warranty tied to that finish — not just the substrate underneath it. Cemplank offers factory-primed and some factory-finished options, but the finish warranty structure and the consistency of that finish from batch to batch has been less predictable in our experience and in what we hear from other contractors and suppliers in the region. Salt air off the bay and constant damp conditions are hard on any painted surface; we'd rather not gamble on a finish we can't vouch for after fifteen years of exposure.
Installer Training and Accountability
Hardie backs its installer network with training programs, installation specifications, and a "Preferred Contractor" structure that ties warranty performance to correct installation. If a Hardie job is installed to spec and something goes wrong with the product, there's a clear manufacturer relationship behind it. Cemplank's contractor support and training infrastructure in our region is thinner, which means more of the burden for getting details right — flashing, fastening patterns, clearances — falls on general judgment rather than a documented, manufacturer-backed process we can point to if a warranty question ever comes up.
Why the Local Climate Makes This a Bigger Deal
Lynden sits close enough to the water that salt-laden air is a real factor on siding, trim, and fasteners, especially on homes with western or southern exposure. Add in Whatcom County's long stretch of driving rain from fall through spring, and a moss season that can run six months or more on shaded elevations, and you have a climate that punishes any weak point in a siding system — a soft factory finish, an under-engineered substrate, or a fastening detail that wasn't installed exactly to spec. None of that is dramatic on day one. It shows up as fading, chalking, or edge deterioration five, eight, twelve years in, which is exactly when it's hardest to trace back to a product or installation decision.
This is also why we're picky about caulking, flashing, and fastener spacing regardless of what siding is going on a house — but starting with a product that's engineered for our specific climate zone gives us one less variable to manage.
Warranty: What to Actually Compare
Warranty comparisons get thrown around loosely in the siding industry, so here's what we tell homeowners to actually look at line by line rather than trusting a headline number.
| Factor | What to Ask | Why It Matters |
|---|---|---|
| Substrate warranty length | Is it prorated, and after what year? | Prorated warranties can pay out a fraction of replacement cost later in life |
| Finish warranty | Is the factory finish covered separately from the board? | Fading and chalking are cosmetic but visible, and often excluded or limited |
| Transferability | Does it transfer to a new owner, and is there a fee or deadline? | Affects resale value and buyer confidence |
| Labor coverage | Does the warranty cover reinstallation labor, or material only? | Labor is usually the larger cost if a defect surfaces |
| Manufacturer stability | How long has the brand operated in this specific climate region? | A warranty is only as good as the company's presence to honor it |
When we walk homeowners through this comparison side by side, the gap between Hardie's warranty structure and what's typically offered on Cemplank becomes a lot clearer than it looks from a one-line quote sheet.
Availability and Long-Term Ownership
One practical issue we run into: matching siding for repairs or additions years after the original install. James Hardie's distribution and color programs are deep enough in the Pacific Northwest that finding a matching profile and color for a repair, a garage addition, or storm damage patch is rarely a problem. We've had a harder time sourcing exact Cemplank matches for repair work on existing homes, which can turn a small repair into a much bigger cosmetic project than it should be. For a siding job that's supposed to last multiple decades, ease of future servicing is part of the real cost of ownership, even though it never shows up on the original estimate.
Why We Standardized on James Hardie
We made the decision to install only James Hardie fiber cement siding — not LP SmartSide, not vinyl, not Cemplank, not Allura, not primed spruce or cedar — because it lets us stand fully behind every job we do. Hardie's HZ5 formulation is engineered for exactly the freeze-thaw, high-moisture conditions Whatcom County sees. The ColorPlus factory finish is backed by a specific, well-documented warranty. The company has a long track record and strong distribution in this region, which matters both for the original install and for repairs decades later. And because we're trained and accountable to a single manufacturer's installation specification, there's no ambiguity about what "installed to spec" means when we're on your roofline with a nail gun.
That's not a knock on every other fiber cement product on the market. It's a statement about what we're willing to put our name behind, on a coastal Washington home that has to survive salt air, driving rain, and moss season year after year.
A Checklist Before You Sign Any Siding Contract
- Ask for the specific product line and climate-zone rating, not just the brand name
- Get the finish warranty terms in writing, separate from the substrate warranty
- Confirm whether the warranty is prorated and at what year it steps down
- Ask how easy it is to source matching material for future repairs
- Check whether your installer is manufacturer-trained or certified on that specific product
- Compare total installed cost, not just material price per square foot
If you're weighing siding options for a home in Lynden or elsewhere in Whatcom County, we're happy to walk through what we'd recommend and why, with no pressure to sign anything. Reach out for a free estimate and we'll give you the same straight answers you just read here, in person, for your specific house.