Bellingham Exterior Two Fiber Cement Products, One Choice We Made
Cemplank is genuine fiber cement siding, and fiber cement as a category is the right call for a home in Whatcom County. It doesn't rot, it resists the moss and mildew that chew through wood siding here, and it holds paint far better than vinyl holds up to a Bellingham winter. So when homeowners ask why we don't install Cemplank, the honest answer isn't that the product is a scam or that it falls apart. It's that after comparing the two systems side by side, we standardized on James Hardie and decided to stand behind one product line we know inside and out, rather than juggling several.
Where Cemplank Gets It Right
Fiber cement in general — Cemplank included — solves the core problems that plague siding on the Washington coast: it's non-combustible, it doesn't feed insects, and it shrugs off the driving rain that comes sideways off Bellingham Bay most winters. If you've got a Cemplank installation from another contractor and it was installed to spec, it's not a ticking time bomb. It's a reasonable siding product.
The Trade-Offs That Made Us Pass
1. Factory Finish vs. Field Paint
This is the biggest practical difference. Hardie's ColorPlus finish is baked on at the factory under controlled conditions, with a 15-year finish warranty backing it. A lot of Cemplank installations rely on primed boards that get painted on site, after the siding is already on the wall. Field-applied paint is only as good as the weather on the day it goes on and the crew doing the work — and in a region with our humidity and moss season, a rushed or under-cured paint job shows up as peeling and streaking years sooner than it should.
2. Climate-Specific Engineering
Hardie builds its HardiePlank product in different formulations for different climate zones — including an HZ10 version engineered specifically for the wet Pacific Northwest, tuned for moisture cycling and freeze-thaw behavior. We haven't seen that same level of region-specific engineering documented for Cemplank. In a climate where siding sees near-constant damp for months at a stretch, that distinction matters more here than it would in Arizona.
3. Warranty Structure
Hardie's warranty is transferable to a new homeowner and is backed by a manufacturer with decades of fiber cement production behind it. Warranty terms and claims support on Cemplank have been less consistent from what we've seen and heard from other contractors in the trade — and a warranty is only worth what's behind it when you actually need to use it, which for siding might be 12 years down the road, long after the crew that installed it has moved on.
4. One Product, Deep Expertise
Every fiber cement product has its own quirks — cut clearances, fastener spacing, flashing details, caulking rules. Hardie publishes detailed, product-specific installation guidance, and because it's what we install on every job, our crews aren't relearning a different rulebook each time. Consistency in installation matters as much as the product itself; a lot of fiber cement failures we get called out to inspect trace back to installation shortcuts, not the material.
| Factor | Cemplank | James Hardie |
|---|---|---|
| Finish | Often primed, painted on site | Factory-applied ColorPlus, 15-yr finish warranty |
| Climate engineering | Standard formulation | HZ10 zone-specific for the Pacific Northwest |
| Warranty | Varies by product line | Transferable, manufacturer-backed |
| Installer familiarity (this company) | Not our standard | Every job, every crew |
Why This Matters More in Bellingham
Whatcom County isn't a mild climate to build in. We get salt-laden air off Bellingham Bay, driving rain that hits siding at an angle for months at a time, and a moss season that stretches from fall through spring on any wall that doesn't see much sun. Siding here needs a finish that won't chalk or peel under UV and damp cycling, a substrate engineered for constant moisture exposure, and installation details — starter strips, gaps, caulking — done correctly the first time, because re-doing a wall two stories up isn't a small job. That's the environment we're installing into on every project, and it's why we didn't want to split our attention across multiple fiber cement brands with different rules.
What We Install Instead
We install James Hardie exclusively — HardiePlank lap siding, HardiePanel, and trim, in the HZ10 formulation built for this climate, with the ColorPlus factory finish so you're not depending on field paint to hold up through a Bellingham winter. It's non-combustible, it's backed by a real transferable warranty, and it's the one system our crews install on every single job, which means no guessing on details.
If you're comparing siding options for a home in Bellingham or anywhere in Whatcom County, we're happy to walk through what we'd recommend for your specific house — sun exposure, wall orientation, and budget all factor in. Reach out for a free, no-pressure estimate and we'll give you a straight answer.
