Lynden Siding If you've been pricing out fiber cement siding in Lynden, you've probably run into two names over and over: James Hardie and Cemplank. Both are fiber cement products, both are sold as a step up from vinyl, and both show up in bids from contractors across Whatcom County. We get asked often enough why we quote Hardie and not Cemplank that it's worth laying out the real differences, plainly, instead of just saying "we prefer one brand."
What Cemplank Is
Cemplank is a fiber cement siding line manufactured by Saint-Gobain, sold mostly through Foundation Building Materials and similar distributors. It's a legitimate fiber cement product — cellulose fiber, sand, and cement pressed and cured, the same basic manufacturing category as Hardie. On paper it competes directly: lap siding, panels, similar plank widths, similar fire resistance, similar pitch as a durable alternative to wood or vinyl.
For a contractor pricing a job on material cost alone, Cemplank can look like an easy way to shave a few dollars a square foot off a bid while still calling the job "fiber cement." That's exactly where the comparison gets more complicated than the spec sheets suggest.
Where the Two Products Actually Diverge
The core material — Portland cement, sand, cellulose fiber — is similar across most fiber cement brands. The differences that matter to a homeowner in this climate show up in three places: factory finish, engineering for regional conditions, and manufacturer support after installation.
Factory Finish and Field Painting
James Hardie's ColorPlus finish is baked on in a controlled factory environment and backed by its own finish warranty, separate from the substrate warranty. Cemplank is typically sold primed, meaning the finish coat gets applied on-site, in the field, by whoever is doing the install — weather conditions, humidity, and applicator skill all become variables. In Whatcom County, where damp, low-drying conditions are common much of the year, a field-applied finish has a much narrower window to cure properly than a factory-baked one. Get that window wrong and you're looking at premature peeling or uneven color a few years down the road — not because the substrate failed, but because the finish never had the conditions it needed.
Engineering for Wet, Salt-Air, Coastal-Adjacent Climates
Lynden sits inland from Bellingham Bay, but Whatcom County as a whole deals with a long wet season, driving rain off the Fraser Valley, and enough salt-laden air moving in from the Sound that moisture management is a real design consideration, not an afterthought. James Hardie engineers specific product lines (their HZ5 formulation, for example) for these exact conditions — moisture resistance, freeze-thaw behavior, and moss-prone shaded exposures are built into the product spec, not bolted on. Cemplank doesn't offer that kind of climate-zone-specific engineering; it's a more generalized product sold the same way across regions with very different weather.
Warranty Structure and Transferability
James Hardie backs its siding with a long, clearly documented, transferable warranty that survives a change of ownership — a real factor if a homeowner sells within the warranty period. Cemplank's warranty coverage is thinner and less consistently documented in the field, and finish warranties in particular get complicated when the topcoat was applied by a third-party installer rather than the manufacturer.
| Factor | Cemplank | James Hardie |
|---|---|---|
| Finish | Typically primed, field-painted | Factory-baked ColorPlus finish |
| Climate engineering | General-purpose formulation | Region-specific lines (e.g. HZ5 for wet/humid zones) |
| Warranty | Shorter, less consistent | Long-term, transferable |
| Availability of matched trim/accessories | Limited | Full engineered system |
Why We Made the Call We Made
We're not going to tell you Cemplank is a bad product — it's a real fiber cement siding and plenty of installers use it honestly. Our issue isn't with the material itself; it's with what happens after it's on the wall in a place like Lynden. A field-applied finish that has to cure through our wet stretches, moss creeping in on north-facing walls that were never engineered with that exposure in mind, and a warranty that gets murky the moment a third party did the painting — those are the exact failure points we'd rather not explain to a homeowner five years after the fact.
James Hardie lets us hand a customer one warranty, from one manufacturer, covering both the board and the finish, on a product line that was actually engineered for the moisture and moss pressure this region puts on a house. That's a simpler conversation for us to have honestly, and a simpler outcome for the homeowner to count on. So we standardized on it, and we only install Hardie.
What This Means If You're Comparing Bids
If you're collecting quotes and one contractor is proposing Cemplank at a lower price than another proposing Hardie, you're not just comparing labor rates — you're comparing two different long-term bets on how the product will hold up against Whatcom County's rain, salt air, and moss season, and two different warranty conversations if something goes wrong. Worth asking directly: is the finish factory-applied or field-applied, and whose name is on the warranty if the paint fails but the board doesn't?
If you're weighing siding options for a home in Lynden or anywhere else in Whatcom County, we're happy to walk through what we'd actually recommend for your house's exposure and orientation. Reach out for a free, no-pressure estimate — no obligation, just a straight answer.