Bellingham Siding Two Fiber Cement Products, One Big Difference in How We Feel About Them
If you've been shopping for fiber cement siding in Whatcom County, you've probably run into two names: James Hardie and Cemplank. Both are cement-based composite siding products. Both are pitched as tougher and longer-lasting than wood or vinyl. On paper, they can look like interchangeable options separated mostly by price. In practice, after years of installing siding on homes up and down Bellingham's neighborhoods and out into the county, we've settled on installing only James Hardie. This page explains why, and it does so honestly — Cemplank is a legitimate fiber cement product, not a scam or a knockoff. But there are real differences in the details that matter once a product is on a wall facing forty years of Pacific Northwest weather.
We're not writing this to bad-mouth a competitor's product line. We're writing it because homeowners deserve to understand what they're comparing before they sign a contract, and because our own standard is something we're happy to explain rather than just assert.
What Cemplank Actually Is
Cemplank is a fiber cement siding product manufactured by Louisiana-Pacific-owned or affiliated production, distributed largely through building supply channels rather than a dedicated national brand infrastructure. Like other fiber cement products, it's made from a mix of cement, cellulose fiber, and sand, pressed and cured into planks, panels, and trim pieces. Structurally, the raw material science of fiber cement is similar across manufacturers — it's non-combustible, resists rot in a way wood can't, and holds paint better than most substrates.
Where products in this category start to differ is in manufacturing consistency, factory finishing options, engineering for specific climates, and the depth of the warranty and support system standing behind the product once it's on your house. That's where our comparison actually lives — not in the base chemistry, but in everything built around it.
Where the Two Products Overlap
- Both are cement-based composite siding, not wood, not vinyl, not engineered wood strand product
- Both resist fire better than wood siding or vinyl
- Both are installed with similar fastening methods, and both require correct clearances and joint treatment to perform
- Both can be finished with factory paint or field-applied paint, depending on the specific product line
Factory Finish: ColorPlus vs. Field-Painted or Basic Prefinish
This is one of the more practical differences homeowners overlook until they're five years into ownership. James Hardie's ColorPlus finishing system is a multi-coat, baked-on factory finish applied and cured under controlled conditions, backed by its own dedicated finish warranty separate from the substrate warranty. It's engineered specifically to resist the fading and cracking that comes from UV exposure and the freeze-thaw-and-soak cycle we get here, where a plank can be soaked by driving rain one week and hit with a rare hard frost the next.
Cemplank's finish options vary by product line and distributor, and in many cases the finish quality and warranty depth simply aren't matched to the same standard. That doesn't mean every Cemplank installation will fail early — it means the margin for error is thinner, and the burden of touch-up painting is more likely to land back on the homeowner sooner than they'd expect from a "40-year siding" pitch.
Climate Engineering: Built for Whatcom County or Built Generic?
Bellingham siding doesn't have it easy. We're dealing with salt air rolling in off Bellingham Bay and the Salish Sea, driving rain that comes sideways for days at a time in the winter, and a moss season that can run from October through April on north-facing walls and anything shaded by evergreens. Siding here needs to shed water aggressively, resist moisture wicking at the seams, and hold a finish that doesn't chalk or streak under near-constant damp.
James Hardie engineers specific product lines — HardiePlank HZ5, for instance — for exactly this kind of climate zone, with moisture management built into the plank profile and installation specs. Cemplank's product line is less segmented by climate zone; you're generally getting one version of the product regardless of whether it's headed to a dry inland region or a wet coastal county like ours. For a house three blocks from the water in Fairhaven or up in a shaded lot in the Lake Whatcom foothills, that difference in climate-specific engineering isn't cosmetic — it's the difference between siding that's doing extra work for your specific site conditions and siding that's just doing the general-purpose job.
What "Climate Engineered" Actually Means on the Wall
- Plank profiles designed to shed driving rain rather than let it pool at laps
- Moisture content specs tuned to reduce swelling and shrinkage in a wet-dry cycle climate
- Finish chemistry tested against extended damp and UV exposure, not just heat and dry-climate sun
- Installation guidance that accounts for high-moisture regions specifically, not a one-size-fits-all spec sheet
Manufacturing Consistency and Installer Support
A siding product is only as good as the crew installing it, but a crew is only as good as the training, documentation, and support behind the product they're using. James Hardie runs a dedicated contractor training and certification program, publishes detailed climate-specific installation manuals, and maintains a large enough installed base that installers run into and solve the same edge cases repeatedly — how to flash a window in a high-rain zone, how to handle inside corners near grade, how to manage expansion gaps correctly.
Cemplank, distributed more through general building supply channels, doesn't have the same scale of dedicated contractor training infrastructure. That's not a knock on the material itself — it's a practical reality that affects how consistently the product gets installed correctly across different crews and regions. Since fiber cement siding failures are overwhelmingly installation failures rather than material failures, the depth of installer support behind a product matters as much as the plank itself.
Warranty Structure: Read the Fine Print
Warranties on fiber cement siding typically split into two parts: a substrate warranty covering the physical plank material, and a finish warranty covering paint performance. The gap between products often shows up in the finish warranty length, the transferability terms if you sell the home, and whether the warranty is backed by a company with the scale to still be honoring claims fifteen or twenty years from now.
| Factor | James Hardie | Cemplank (Typical) |
|---|---|---|
| Factory finish system | ColorPlus, multi-coat baked-on finish | Varies by line; often less robust finish process |
| Climate-specific engineering | HZ zone-specific product lines | Generally one product spec regardless of region |
| Installer training network | Dedicated national certification program | Limited formal installer certification |
| Warranty transferability | Transferable, clearly documented terms | Varies; terms less standardized |
| Market longevity / brand backing | Long-established, large installed base | Smaller footprint, less field history to draw on |
Cost: Why the Sticker Price Difference Exists
Cemplank often comes in somewhat cheaper than James Hardie, and that price gap is real — it isn't a myth. Part of that gap reflects genuine differences in finish quality and climate engineering described above. Part of it reflects lower brand overhead and a leaner distribution model. For a homeowner comparing two bids side by side, it's tempting to treat the cheaper fiber cement option as a straightforward discount on the same product. We'd encourage you to instead treat it as a different product with a different risk profile — one where the savings today could show up as an earlier repaint, more caulk maintenance, or a less certain warranty claim process ten or fifteen years down the road.
We don't install Cemplank, so we won't quote you a Cemplank price — but we're glad to walk through the real cost difference between siding products honestly when we're out at your home, including what James Hardie actually costs installed to spec in this area.
What This Means If You're Comparing Bids Right Now
If a contractor has quoted you Cemplank siding, that doesn't automatically mean a bad bid — it may simply be the product line that contractor stocks or has a supplier relationship with. What we'd suggest is asking pointed questions before you decide, regardless of which contractor or product you're considering.
- Ask what the finish warranty covers specifically, and for how many years, separate from the substrate warranty
- Ask whether the specific product line is engineered for coastal, high-moisture climates or is a general-purpose spec
- Ask what installer certification or training the crew has completed for that specific product
- Ask how the warranty transfers if you sell the home within the warranty period
- Get the installation spec sheet and ask how the contractor handles inside corners, flashing, and expansion gaps in wet climates like ours
Why We Standardized on James Hardie
We made a decision a while back to install only James Hardie fiber cement siding, full stop. Not because Cemplank is unusable, but because we didn't want to be in the position of explaining, years later, why a finish faded faster than expected or why a warranty claim came back thinner than a homeowner assumed. James Hardie's climate-specific HZ product lines, the ColorPlus factory finish, the depth of installer training, and the warranty structure all line up with what actually holds up against Bellingham's salt air, sideways winter rain, and long moss season. Standardizing on one product also means our crews get deeper, more consistent experience installing it correctly, rather than switching specs and details between two different manufacturers' systems from job to job.
That's the honest version of why you won't get a Cemplank quote from us. We'd rather tell you that plainly than pretend the two products are equivalent and let price be the only deciding factor.
If you're weighing fiber cement options for your Bellingham home, we're happy to walk your project through what James Hardie actually involves — product lines, colors, and what correct installation looks like for our climate. Fill out the form below for a free, no-pressure estimate.