Birch Bay What Cemplank Is, and Why Homeowners Ask About It
Cemplank is a fiber cement siding product, manufactured by Plycem, that shows up regularly in bids around Whatcom County because it's often priced below other fiber cement options. On paper, it checks a lot of the same boxes as the fiber cement siding we do install: it's non-combustible, it resists rot better than wood, and it holds paint or factory finish longer than vinyl. We get asked about it often enough that we think homeowners deserve a straight answer on why we don't put it on houses here, rather than just quietly steering the conversation elsewhere.
Where Cemplank Gets It Right
To be fair to the product, fiber cement as a category is a sound choice for the Pacific Northwest coast. It doesn't feed pests the way wood does, it stands up to driving rain far better than vinyl, and it won't warp or buckle with the humidity swings that come with living this close to the water. Cemplank uses the same basic cement-fiber composition as the products we do install, and in a controlled, well-detailed installation it can perform reasonably well for a number of years.
What Gives Us Pause
Our reservations aren't about the raw material chemistry — they're about consistency, finish, and what happens to a house in Birch Bay specifically over a 20- or 30-year span, not just the first five.
Why We Don't Put It On Homes Here
A few specific trade-offs are why Cemplank isn't part of our lineup:
- Factory finish and color depth. Cemplank's factory-finish and color program is thinner than what we've come to rely on. In direct salt air and UV exposure like Birch Bay gets off the Strait of Georgia, a finish with less baked-in pigment depth tends to show fade and chalking sooner, which means repainting comes around faster than a homeowner usually expects when they're told the siding is "low maintenance."
- Installation tolerance. Fiber cement in general is unforgiving of shortcuts — gaps, caulk-only joints, or wrong fastener patterns all show up as callbacks a few years down the road. We've found Cemplank's product specs and support documentation to be less detailed than what we get from other manufacturers, which puts more of the burden on the installer to get every detail right with less backup from the manufacturer if something goes wrong.
- Moisture behavior over time. Whatcom County's long wet season and near-constant humidity off the bay mean any fiber cement product needs to manage moisture at the cut edges, laps, and butt joints without exception. We've seen enough variability in how different fiber cement mixes handle long-term moisture exposure that we don't want to be the ones deciding, project to project, whether a lower-cost mix will hold up through thirty Birch Bay winters.
- Warranty structure. Cemplank's warranty terms and the way claims get handled are less favorable to the homeowner than what we can back a project with elsewhere. When something does go wrong ten or fifteen years in, the difference between a strong transferable warranty and a thinner one is the difference between a repair that's covered and one that's out of pocket.
What We Install Instead, and Why
We install James Hardie fiber cement siding exclusively, using their HardieZone HZ10 engineered product line, which is formulated specifically for climates like ours — heavy rain, sustained moisture, and salt-laden air. A few things drove that decision:
- ColorPlus factory finish. Hardie's baked-on finish is warrantied against fading and chipping far longer than typical field-applied or lighter factory finishes, which matters directly in a coastal spot like Birch Bay where sun and salt work on a finish year-round.
- Climate-specific engineering. The HZ10 formulation is built for wet, moderate climates rather than being a one-size-fits-all mix, which lines up with what a house here actually deals with — driving rain off the water, a moss season that runs long, and humidity that doesn't let up for months.
- Installation documentation and support. Hardie's install specs are detailed and specific, and there's manufacturer backing when a project is installed to spec, which reduces the guesswork that leads to callbacks.
- Warranty strength. A stronger, transferable warranty protects both the original homeowner and whoever buys the house next, which matters for resale in a market where buyers are increasingly asking what siding is on a house.
The Bottom Line
Cemplank isn't a bad material in the abstract — it's fiber cement, and fiber cement is the right family of product for this coast. Our issue is with the specific trade-offs in finish durability, installation tolerance, and warranty terms that come with this particular product line, especially given what a Birch Bay exterior has to survive: salt air, driving rain, and moss season that doesn't take much of a break. We'd rather install one product line well and stand behind it fully than offer a lower-cost option we can't back with the same confidence.
If you're comparing siding options for a home in Birch Bay or elsewhere in Whatcom County, we're happy to walk through what we'd actually recommend for your house and why. Reach out for a free, no-pressure estimate — there's no obligation, and we'll give you a straight answer either way.