Bellingham Two Products, One Category: Fiber Cement Isn't One Thing
Homeowners in Whatcom County researching siding replacement will run into a confusing fact fast: several different manufacturers sell "fiber cement" siding, and it's easy to assume they're interchangeable. They're not. Fiber cement as a category just means a mix of cement, sand, and cellulose fiber pressed into planks or panels. How that mix is engineered, cured, finished, and backed varies a lot between brands. Cemplank and James Hardie are both legitimate fiber cement products. We only install James Hardie, and this page explains the honest reasoning behind that, product by product, not brand by brand marketing.
This isn't a takedown. Cemplank is a real fiber cement product with real customers, and it has a place in the market. Our decision to standardize on one manufacturer is about what we're willing to put our name behind for the next 30-plus years on a home in Bellingham's climate, and what we can reliably back up with service, parts, and color matching down the road.
What Cemplank Gets Right
To be fair to the product: Cemplank is genuine fiber cement, not a vinyl or composite substitute. That means it shares the core advantages of the category over vinyl or wood siding — it's non-combustible, resistant to insects and rot in a way that untreated wood siding isn't, and it holds paint or factory finish better than most plastic-based products. For a budget-conscious project, it's often priced below James Hardie, and in some markets it's easier to source quickly. Those are real, legitimate reasons some contractors and homeowners choose it.
Where we part ways is in the details underneath that surface-level similarity — the manufacturing consistency, the factory finish system, the climate engineering, and the support network standing behind the product once it's on a wall. Those details matter more in a marine, high-moisture climate than they do in a dry one.
Where the Two Products Actually Diverge
| Factor | Cemplank | James Hardie |
|---|---|---|
| Factory finish | Typically primed, often field-painted or finished after install | ColorPlus baked-on factory finish available, engineered to resist fading and reduce field painting |
| Climate engineering | General-purpose formulation | HardieZone system with region-specific product formulations (HZ5/HZ10) |
| Manufacturer track record in fiber cement | Shorter, more recent presence in the fiber cement category | Multi-decade history as the category's original large-scale manufacturer |
| Distribution and installer network | Sold primarily through building supply channels | Broad certified-installer and dealer network, including in the Pacific Northwest |
| Color and profile matching for future repairs | Depends on local supplier stock at time of repair | Long-running product lines make matching trim, color, and profile easier years later |
| Warranty structure | Manufacturer-backed, terms vary by product line | Manufacturer-backed with a separate ColorPlus finish warranty; commonly transferable to a new owner |
None of these differences make Cemplank a bad product in the abstract. They add up, though, when you're the contractor who has to guarantee the work and the homeowner who has to live with it through a Bellingham winter fifteen years from now.
The Finish Is the First Place Products Diverge
A lot of the visible difference between fiber cement brands comes down to how the color gets onto the board. James Hardie's ColorPlus system applies finish at the factory under controlled conditions, with a separate finish warranty attached to it. That matters practically: a factory-cured finish resists UV fading and moisture intrusion at the coating level more consistently than a coat applied on a job site, where weather, temperature, and dry time are out of anyone's control. Cemplank siding is more commonly installed primed and then field-painted, which shifts finish quality onto the paint crew and the day's weather — a real variable in a region where dry, calm painting windows aren't guaranteed even in summer.
Field-applied finishes aren't automatically bad work. But they add a step, a cost, and a point of failure that a factory-finished product avoids. In a climate with a long wet season, that's not a minor tradeoff.
Engineered for Climate, or Engineered in General
James Hardie's HardieZone system assigns products to climate zones and formulates the cement mix differently for humid, high-moisture regions versus dry ones. Whatcom County sits in a wet marine climate — moss grows on roofs and siding here for a reason — and a product engineered with that moisture exposure in mind behaves differently over decades than a general-purpose formulation used nationwide. Cemplank does not market a comparable region-specific engineering system; it's a more uniform product regardless of where in the country it ships. That's not a defect, but it is a meaningful difference for a house two miles from Bellingham Bay taking salt air and driving rain off the water for nine months a year.
Warranty: What's Actually Backed, and By Whom
Every siding warranty sounds reassuring in a brochure. The real question is what happens when a homeowner calls in year twelve with a cracked board or a fading patch. James Hardie backs its siding with a manufacturer warranty that's commonly transferable to a new owner if the home sells, plus a separate warranty on the ColorPlus finish itself, since the substrate and the coating can fail independently. Cemplank's warranty coverage exists too, but it's structured differently and the company's shorter track record in the category means there's less history to point to when judging how warranty claims actually get handled at scale, especially years down the road.
We don't install a product where we can't confidently tell a homeowner, in plain terms, what's covered, for how long, and who's on the hook if something goes wrong. That confidence comes from decades of James Hardie warranty claims being processed across the country, not from a sales sheet.
Availability Matters More Than People Expect
Siding gets damaged — a ladder slip, a windstorm, a tree branch. When that happens five or ten years after installation, you need the same profile, thickness, and color available to patch it without redoing an entire wall. James Hardie's national scale and long-running product lines make that kind of future repair realistic. Regional or lower-volume products can leave homeowners stuck special-ordering a discontinued profile, or resigned to a visible patch that never quite matches.
Why This Matters More in Bellingham Than Elsewhere
Whatcom County siding doesn't get an easy ride. Homes near Bellingham Bay and the water take salt-laden air that accelerates wear on lower-grade finishes and fasteners. Pacific storms bring driving, wind-pushed rain that finds every gap in flashing and every weak seam in a field-applied coating. And the long, shaded, wet stretch from fall through spring — moss season, essentially — keeps siding surfaces damp for months at a time, which is exactly the condition that separates a well-engineered fiber cement formulation from a generic one. None of this makes Cemplank fail outright. It does mean the margin for error is thinner here than in a dry inland climate, and we'd rather not build a home's exterior on a product with a thinner margin.
Our Standard: Why We Install Only James Hardie
We standardized on James Hardie because we can stand fully behind it: the factory ColorPlus finish reduces field-painting risk, the HardieZone engineering accounts for exactly the wet, salt-exposed climate Whatcom County homes deal with, the warranty coverage is clear and transferable, and the product's long track record means color and profile matching stays realistic for decades. Installing one manufacturer, and installing it correctly every time, also means our crews are deeply practiced on Hardie's fastening, clearance, and flashing requirements rather than switching specs between two different products and risking a mistake on either one.
This isn't about James Hardie being flawless or Cemplank being unusable. It's a professional judgment call about what holds up best, longest, with the least risk, on homes exposed to this specific coastline climate — and it's the standard we're willing to warranty our own labor against.
What to Ask Any Siding Contractor Before You Sign
- Which fiber cement brand and product line are they quoting, specifically — not just "fiber cement"?
- Is the finish factory-applied or will it be painted on site after installation?
- What does the manufacturer's warranty actually cover, and is it transferable if you sell the home?
- Is the product formulated or rated for a wet, marine climate, or is it a general nationwide formulation?
- How easily can the contractor source matching material for a future repair five or ten years out?
- Is the contractor certified or specifically trained on the product they're installing?
If you're weighing siding options for a home in Bellingham or elsewhere in Whatcom County, we're glad to walk through what we see on local homes and why we install what we install. Reach out for a free, no-pressure estimate — no obligation, just a straight answer about your siding.