Lynden Siding Two Fiber Cement Products, One Big Difference in Practice
If you've priced out siding in Lynden or anywhere else in Whatcom County, you've probably heard two names come up constantly: James Hardie and Cemplank. Both are fiber cement siding. Both are marketed as durable, low-maintenance, fire-resistant alternatives to wood and vinyl. On paper, they look like they solve the same problem the same way. In practice, we've found enough daylight between them that we made a decision years ago to install only James Hardie on every home we side, full stop.
This isn't a knock on fiber cement as a category — we think fiber cement is the right call for this climate, moss season and all. This is about the difference between the company that invented and refined the category for 30-plus years, and a competitor product that entered the same space more recently. We want to walk through that difference honestly, because "we don't install that" isn't a satisfying answer without the reasoning behind it.
What Cemplank Gets Right
We'll start with the fair part. Cemplank is a real fiber cement product, not a knockoff vinyl or a composite board pretending to be something it isn't. It shares the same core recipe as most fiber cement siding: Portland cement, sand, and cellulose fiber, cured into a rigid plank. That base recipe gives it real advantages over wood and vinyl:
- It doesn't burn the way wood siding does, which matters during Whatcom County's dry summer stretches.
- It resists rot better than untreated wood or primed spruce, since it has no organic wood fiber to feed decay.
- It holds paint or factory finish longer than wood, and won't warp, crack, or melt like vinyl can in direct sun or against a hot barbecue.
- It's priced competitively, often positioned as a lower-cost alternative to premium fiber cement brands.
If a homeowner has already done their homework and understands fiber cement as a category, Cemplank isn't a dishonest product. It's a real, workable material. Our decision not to install it isn't about the underlying chemistry — it's about everything downstream of that: manufacturing consistency, finish quality, regional engineering, and what the warranty actually does for the homeowner years down the road.
Where "Good Enough" Starts to Matter
Siding isn't a five-year decision. It's a twenty-to-thirty-year decision, installed once and lived with through every wet Lynden winter in between. The gap between "a real fiber cement product" and "the fiber cement product engineered for this exact climate" doesn't show up on install day. It shows up in year eight, year twelve, year twenty — which is exactly when it's most expensive and disruptive to deal with.
The Real Trade-Offs We Weigh
Manufacturing Consistency
James Hardie runs its own dedicated plants and has spent decades refining a proprietary formulation (HardieZone engineering) specifically tuned to regional moisture and temperature ranges. Cemplank, along with several other fiber cement brands, is manufactured by companies that also produce building materials across a wider range of categories, and the plank formulation isn't always regionally engineered in the same way. That doesn't automatically mean a bad board. It means less certainty, batch to batch and region to region, that what's on the truck matches what performed well in the marketing brochure.
Factory Finish vs. Field-Applied or Thinner Coatings
This is the trade-off that matters most to us. James Hardie's ColorPlus finish is baked on in a controlled factory environment, cured under conditions no job site can replicate, and backed by a dedicated finish warranty separate from the substrate warranty. Some competing fiber cement products, including Cemplank in certain lines, are more commonly sold primed only or with a lighter factory coating, which shifts more of the finish quality and longevity onto field-applied paint. Field-applied finish is only as good as the weather on the day it's sprayed and the number of coats actually laid down — and in a region that gets driving rain for months at a stretch, that's a real variable we don't want to gamble on.
Moisture Behavior in a Salt Air, Rainy Climate
Lynden sits inland from the Salish Sea but still gets plenty of moist marine air moving through Whatcom County, on top of a genuinely long wet season and a moss season that can run from fall through spring on north-facing walls. Fiber cement in general handles this far better than wood. But the quality of the plank's core density and edge sealing determines how it handles the small stuff — cut edges at trim, butt joints, penetrations for hose bibs and vents. A denser, more consistently manufactured board with strong factory sealing on the finish resists moisture wicking at those vulnerable points better over the long run.
Warranty Structure
A warranty is only as good as what it actually covers and how long the company backing it has been solvent and in business. James Hardie offers a non-prorated limited warranty on the substrate (30 years residential) plus a separate finish warranty on ColorPlus products, and the company has a multi-decade track record of standing behind claims. Warranty terms on other fiber cement brands vary by product line and can be prorated after a set number of years, meaning the payout shrinks over time even if a legitimate defect shows up. Read the fine print, not just the headline number, before treating any siding warranty as equivalent.
Side-by-Side: What We Actually Compare
| Factor | James Hardie | Cemplank (typical) |
|---|---|---|
| Core material | Fiber cement, regionally engineered (HZ10/HZ5 zones) | Fiber cement, generally not zone-specific |
| Factory finish | ColorPlus baked-on finish, separate finish warranty | Often primed only or lighter factory coat in several lines |
| Substrate warranty | Non-prorated limited warranty, long track record | Varies by line, some prorated schedules |
| Color/style selection | Wide, coordinated trim and accessory system | Narrower or less coordinated in some regions |
| Manufacturer track record | Category-defining, decades of climate-specific R&D | Shorter or less climate-specific development history |
Why Installation Sensitivity Changes the Calculus
Fiber cement, any brand, is unforgiving of bad installation. Wrong fastener pattern, insufficient clearance from grade or roofline, gaps at butt joints, or field-cut edges left unsealed will eventually let moisture in no matter how good the board is. That's true across the category. Where it gets more complicated with a less consistently engineered product is that installers have less documented, brand-specific guidance to lean on for edge cases — how to handle a low-clearance foundation detail, how to flash around a bay window, how to treat a cut edge before it goes up. James Hardie publishes detailed, climate-zone-specific installation manuals and works with contractors on best practice. That documentation is part of why the finished product performs as advertised, not just the board itself.
We standardized on one product so our crews build deep, specific expertise with it — not a working knowledge of several products spread thin. Every fastener spacing, every flashing detail, every clearance requirement, we know cold, because it's the only system we install.
What This Means for Your Home in Lynden
Whatcom County homes take a specific kind of beating: sustained rain rather than short violent storms, humidity that lingers, and moss that will colonize any north-facing wall that holds moisture even a little too long. None of that is dramatic, day to day. It's cumulative. A siding system that's 90% as good performs fine for the first several years and then starts showing the gap in year ten or fifteen, right around when a homeowner assumed they were done thinking about their exterior for another decade.
We'd rather install the system with the strongest documented track record for this specific kind of long, wet, moss-prone climate than save a modest amount up front on a product with a thinner performance record here.
Questions Worth Asking Any Contractor
- Is the finish factory-applied and warrantied separately, or will it need field-applied paint?
- Is the warranty non-prorated, and for how many years?
- Is the product engineered for this specific climate zone, or is it a one-size-fits-all national product?
- How many of this exact product has the crew installed, and do they carry brand-specific installation training?
- What does the manufacturer's own installation guidance say about flashing, clearance, and fastening for this region?
Why We Draw the Line Here
We're not going to tell a homeowner that Cemplank is unsafe or that it will fail on their house. We are telling you that after years of installing fiber cement siding in this specific climate, we decided the differences in factory finish, warranty structure, and climate-specific engineering were significant enough that we didn't want to install two tiers of the same category and let customers sort out which one they got. We picked the one with the deepest track record and the strongest backing, and we stopped installing the alternative. That's a standard we hold for our own business, not a verdict on every competing product on the market.
If you're weighing siding options for a home in Lynden or elsewhere in Whatcom County, we're happy to walk through what we install, why, and what it would look like on your specific house. Reach out for a free, no-pressure estimate — no obligation, just a straight answer about what your home needs.