Bellingham Siding Two Fiber Cement Products, One Installer's Choice
Cemplank and James Hardie are both fiber cement siding — a mix of cement, sand, and cellulose fiber pressed into planks and panels. On paper, they look similar: both are non-combustible, both resist rot better than wood, and both hold paint or factory finish longer than vinyl. That similarity is exactly why homeowners in Bellingham ask us about Cemplank, and why we think the question deserves a straight answer instead of a sales pitch.
We install James Hardie exclusively. Not because Cemplank is a bad product in the abstract, but because of what we've learned matters most for homes here in Whatcom County — salt air off Bellingham Bay, driving winter rain, and a moss season that seems to run about ten months of the year.
What Cemplank Gets Right
Cemplank is a legitimate fiber cement product, manufactured by Plycem/Etex. It's non-combustible, it doesn't attract insects the way wood siding can, and it's a real step up from vinyl or engineered wood in terms of durability. For a lot of markets, it's a reasonable siding choice, and we're not going to pretend otherwise.
Where the Trade-Offs Show Up
Our reservations aren't about whether Cemplank is "fake" fiber cement — it isn't. They're about three practical things that matter in a wet, coastal Pacific Northwest climate: factory finish, regional engineering, and local support.
Factory Finish Coverage
James Hardie's ColorPlus finish is baked on in a controlled factory process and backed by its own 15-year finish warranty, separate from the product warranty. Cemplank's color options and finish programs are narrower, and in our experience that means more jobs end up needing field-applied paint. Field-applied finishes are more exposed to application variables — weather during install, painter skill, coverage consistency — and in a region where siding gets rained on more months than not, a factory-cured finish is one less variable we have to manage.
Climate-Specific Product Lines
Hardie engineers regional product lines — HZ5 for the Pacific Northwest's specific combination of moisture, temperature swings, and freeze-thaw exposure. That's not a marketing label; it affects the plank's moisture resistance and dimensional stability. We haven't seen an equivalent regional engineering commitment from Cemplank for our climate zone.
Availability and Warranty Support
Hardie has a large, established installer and distributor network in Western Washington, which means consistent product availability, matched trim and accessories, and a warranty backed by a company with a long track record of standing behind claims. Cemplank's presence in our area is thinner. If a warranty issue comes up ten or fifteen years from now, we want our customers backed by a manufacturer whose regional support isn't in question.
Why the Bellingham Climate Raises the Stakes
None of this would matter as much in a dry inland climate. But Whatcom County homes deal with salt-laden air near the water, sustained driving rain off the Sound, and long stretches of shade and dampness that feed moss and algae growth on north-facing walls and anything under tree cover. Siding here isn't just cosmetic — it's the first line of defense against near-constant moisture exposure. That's why finish durability and moisture engineering aren't nice-to-haves for us; they're the whole ballgame.
A siding product that performs fine in Denver or Phoenix doesn't automatically perform the same way here. We've built our installation standards around what actually holds up through a Bellingham winter, not around what looks comparable on a spec sheet.
Side-by-Side Summary
| Factor | Cemplank | James Hardie |
|---|---|---|
| Material type | Fiber cement | Fiber cement |
| Factory finish | Limited color/finish program | ColorPlus, factory-cured, separate 15-yr finish warranty |
| Regional engineering | General-purpose formulation | HZ5 line engineered for Pacific Northwest moisture/climate |
| Local availability & support | Limited distributor network in our area | Established regional network |
Why We Standardized on Hardie
We made a decision years ago to install one fiber cement product rather than quote whichever one a homeowner had heard of. That decision came down to consistency: with Hardie, we know the finish will hold up, the product line is matched to our climate, and the warranty is backed by a company with real presence here. That consistency lets us stand fully behind every install, without hedging.
If you're comparing siding options for a home in Bellingham or elsewhere in Whatcom County, we're happy to walk through what we install and why, with no pressure either way. Reach out for a free estimate and we'll take a look at your home's specific exposure and give you an honest read on what it needs.