Lynden Siding Two Fiber Cement Brands, One Contractor Standard
If you've been pricing out siding in Lynden or anywhere else in Whatcom County, you've probably run into two names that keep coming up: James Hardie and Cemplank. Both are fiber cement siding. Both are sold as a step up from vinyl. Both show up on bid sheets from different contractors around town. So why does our crew only carry one of them?
This isn't a case of one product being junk and the other being gold. Fiber cement, as a category, is fiber cement — a mix of Portland cement, sand, and cellulose fiber pressed into planks and cured. Cemplank and Hardie are both legitimate manufacturers making a legitimate product category. The differences that matter to us are in the details: how the product is engineered for our specific climate, how consistent the manufacturing and finish quality are from batch to batch, how the warranty actually functions when something goes wrong years down the road, and how much local support exists if a claim needs to be filed. Those details are where we've drawn a hard line.
What Cemplank Gets Right
We're not going to pretend Cemplank is a bad product to score points. Cemplank is manufactured by Plycem/Etex, a large international building materials company, and the core fiber cement formulation does what fiber cement is supposed to do: it resists fire far better than wood or vinyl, it doesn't attract woodpeckers or insects, and it holds paint or factory finish longer than wood lap siding ever will. For a homeowner comparing it only against vinyl or raw cedar, Cemplank is a genuine upgrade in durability and fire resistance.
Cemplank is also generally priced a notch below James Hardie, which is part of why it shows up in competitive bids. On paper, a lower material cost with the same "fiber cement" label looks like an easy win. The problem is that the label hides real differences once you get past the spec sheet and into how the product performs on an actual house, in actual Pacific Northwest weather, over fifteen or twenty years.
Where the Two Products Actually Diverge
Regional Engineering
James Hardie makes climate-specific product lines — HZ5 for the northern, wetter, freeze-prone parts of the country, HZ10 for hot and humid regions — engineered with different formulations for the moisture and temperature cycling each region sees. Lynden sits in a marine climate with heavy fall and winter rain, coastal salt air drifting in off the Sound, and a long moss and mildew season that runs from October well into spring. Hardie's HZ5 formulation is built with that combination in mind. Cemplank does not offer a comparable region-specific product line — it's a more generic formulation sold nationally, which means it wasn't specifically engineered around the wet, salt-air, low-sun conditions that define a Whatcom County exterior.
Manufacturing Consistency
Fiber cement is only as good as its dimensional consistency and cure quality. Hardie has built its reputation over three decades specifically as a fiber cement specialist, with tight manufacturing tolerances and a factory-applied finish system (ColorPlus) that's been refined through multiple generations. Cemplank, as part of a broader multi-category building materials portfolio, doesn't have the same singular focus on fiber cement as its core product. That shows up in small but real ways on a job site — plank straightness, edge consistency, and how predictably the material machines and fastens.
Factory Finish vs. Field-Applied Paint
This is one of the biggest practical differences. Hardie's ColorPlus finish is baked on at the factory in a controlled environment, backed by its own dedicated finish warranty. Cemplank siding is more commonly sold primed, requiring a field-applied paint job after installation. A field-applied finish is only as good as the painter, the weather on the day it's applied, and the paint product used — and in a region where it can rain on and off for a week straight, getting a proper field finish cured correctly adds real risk and cost that a factory finish avoids entirely.
Side-by-Side Comparison
| Factor | Cemplank | James Hardie (HZ5) |
|---|---|---|
| Climate-specific formulation | Generic, national formulation | Engineered for wet/marine climates like ours |
| Factory finish | Commonly sold primed, needs field paint | ColorPlus factory finish, cured before install |
| Finish warranty | Tied to whatever paint is applied after install | Separate factory finish warranty, up to 15 years on ColorPlus |
| Product warranty | Limited, varies by product line | Non-prorated limited warranty, transferable to new owners |
| Local installer network | Smaller regional presence | Widely installed and supported in the Pacific Northwest |
| Fire resistance | Non-combustible fiber cement | Non-combustible fiber cement |
| Typical material cost | Somewhat lower | Somewhat higher, reflected in longer service life |
Warranty Structure: The Part Homeowners Skip
Almost nobody reads a warranty document before buying siding, and that's understandable — they're long and dense. But the warranty is where the real difference between these two products shows up years after installation, when it actually matters. James Hardie backs its siding with a warranty that's non-prorated and transferable to a subsequent homeowner, which matters if you ever sell the house. Cemplank's warranty coverage exists but is structured differently and doesn't carry the same track record of national claims support that Hardie has built over its history as the market leader in fiber cement.
A warranty is only useful if the company behind it is still around, still making the exact product you installed, and has a claims process that doesn't require you to fight for a resolution. That's a harder thing to verify with a smaller regional player than with the company that effectively created the fiber cement siding category in North America.
What to Ask Any Contractor Before You Sign
- Which specific product line and climate zone rating is being quoted — not just "fiber cement"?
- Is the finish factory-applied or will it need field paint after installation?
- Is the warranty transferable if you sell the home within the coverage period?
- What does the manufacturer's claims process actually look like, and has the contractor filed one before?
- Is the contractor a certified installer for the specific brand being quoted?
Why We Chose to Standardize on James Hardie
Running two fiber cement product lines side by side means keeping two different fastening schedules, two different caulking and finish protocols, two sets of manufacturer install guidelines, and two warranty registration processes in our heads on every job. We decided that's a bad trade for a marginal material cost savings on one brand. Standardizing on James Hardie means our crew installs one product, to one spec, every time — which reduces the chance of a detail getting missed because someone's used to the other brand's fastening pattern.
It also means when we tell a homeowner what warranty coverage they're getting, we're not hedging with "it depends which one we used on your house." Every Hardie install we do is registered the same way, backed by the same national warranty structure, with a factory finish that's been engineered and tested specifically for climates like ours.
How This Plays Out on a Lynden House
Whatcom County exterior work has to survive a specific combination of stressors: months of low-intensity rain that keeps siding damp longer than a drier climate would, salt-tinged air moving in from the Strait of Georgia and Bellingham Bay, and shaded north- and west-facing walls that stay green with moss if the material and finish don't resist it well. A siding product that was engineered generically for national distribution, then finished in the field under whatever weather window a painter could find, is working against more variables than a product engineered specifically for this kind of moisture cycling with a factory-cured finish already locked in before it ever reaches the truck.
We see the results of that gap on tear-off jobs — not just with Cemplank, but with any siding product that wasn't matched to the climate it ended up in. That pattern is a big part of why our standard changed to Hardie-only years ago and hasn't moved since.
What This Means for Your Bid
If you get a quote from us, it will be for James Hardie fiber cement — no exceptions, and no "budget alternative" line item for Cemplank or another brand. We'd rather lose a bid to a lower material cost than install a product on your home that we're less confident will hold up through a Lynden winter, or that comes with a warranty structure we can't stand behind as confidently. If a lower upfront cost is the deciding factor, we'll tell you honestly that Hardie may not be the cheapest quote you get — but we won't put our name on an install we're not fully behind.
If you'd like to see what a James Hardie install actually costs for your specific home, we're happy to walk the property, look at your current siding condition, and put together a straightforward, no-pressure estimate. There's no obligation and no sales pressure — just a clear picture of the options and the honest reasoning behind our recommendation.