Semiahmoo Siding Cedar comes up a lot when Semiahmoo homeowners talk about siding. It's a beautiful, classic Pacific Northwest material, and there's a reason it's been used on homes here for generations. But we don't install it — not because it's a bad product, but because we've seen what it actually takes to keep cedar looking and performing the way homeowners expect in this specific climate, and we'd rather be honest about that upfront than sell something we can't stand behind long-term.
What Cedar Gets Right
Cedar's appeal is real. It has a warmth and texture that manufactured products spend a lot of effort trying to replicate. It's a renewable material, it takes stain and paint well when properly prepped, and a well-built cedar exterior can be genuinely striking. Cedar also has natural resistance to decay and insects compared to other softwoods, thanks to oils in the wood itself. None of that is in dispute.
The Maintenance Reality
The problem isn't cedar on day one. It's cedar on year eight, or year twelve, in a place like Semiahmoo. This stretch of Whatcom County sits right on the water, which means siding here deals with salt air, driving rain off the Strait, and a moss season that can run for much of the year in shaded or north-facing areas. Cedar is a natural, porous material, and it responds to that environment on its own schedule, not the homeowner's.
- Cedar needs to be refinished — stained or painted — on a recurring cycle, typically every 3 to 7 years depending on exposure, sun, and finish quality. Skip a cycle in a wet climate and the wood starts absorbing moisture it shouldn't.
- Moss and mildew take hold readily on cedar in shaded, damp areas, which is much of the year here. Left alone, they hold moisture against the wood and accelerate rot.
- End grain, butt joints, and any spot where the factory finish has worn through are entry points for water. Once moisture gets behind or into the board, cedar can cup, split, or rot from the inside out — often before it's visible from the ground.
- Cedar boards vary board to board. Even with careful sourcing, grain and density differ, which means finish absorbs unevenly and some boards weather faster than their neighbors.
None of this is a defect in the wood. It's just what a natural, permeable material does when it's asked to handle sustained coastal moisture year after year. Cedar can be made to last a long time — but only with a maintenance commitment that most homeowners underestimate when they're picking siding, and one that gets harder to keep up with as years go by.
Why We Won't Install It
We stand behind our workmanship with a warranty, and that's difficult to do honestly on a product whose long-term performance depends almost entirely on how consistently the homeowner refinishes and maintains it after we leave. If a cedar exterior isn't recoated on schedule, or if moss is allowed to sit against the wood through a wet Whatcom County winter, the siding can fail in ways that have nothing to do with how well it was installed. We don't think it's fair to put a product on someone's home, take payment, and then have its long-term success depend on a maintenance routine we can't control and they may not fully realize they're signing up for.
There's also a cost-of-ownership piece that's easy to miss at the time of installation. Between periodic refinishing, moss treatment, caulking, and spot repairs, cedar's lifetime cost often ends up higher than homeowners expect when they're comparing it to lower-maintenance materials at the outset.
What We Install Instead
We install James Hardie fiber cement siding exclusively. It's non-combustible, dimensionally stable, and engineered to resist the moisture-driven problems — cupping, splitting, rot — that natural wood products are prone to in a marine environment. Hardie's ColorPlus factory finish is baked on rather than field-applied, and it's backed by its own warranty against fading, cracking, and peeling, which removes the refinishing cycle that cedar demands. Hardie also builds climate-engineered HZ product lines specifically for regions like ours, dealing with salt air, sustained rain, and temperature swings, rather than a one-size-fits-all board.
It's also backed by a strong, transferable warranty — a real advantage for homeowners who may sell down the road, since a new owner isn't inheriting an unknown maintenance history the way they would with a cedar exterior. Installed to manufacturer spec, with correct flashing, fastening, and clearance detailing, it's a product we're confident will look and perform the way it's supposed to for decades, without asking the homeowner to manage a recurring finish schedule just to keep water out of the wall.
An Honest Comparison, Not a Sales Pitch
| Factor | Cedar | James Hardie Fiber Cement |
|---|---|---|
| Refinishing cycle | Every 3-7 years | Factory finish, no refinishing cycle |
| Moisture behavior | Absorbs; can cup, split, rot | Engineered for sustained moisture exposure |
| Combustibility | Combustible | Non-combustible |
| Warranty | Workmanship only; finish depends on maintenance | Manufacturer warranty covers the product itself |
We're not telling you cedar siding will fail on your house — plenty of well-maintained cedar homes around Semiahmoo and the rest of Whatcom County hold up fine for years. What we're telling you is that we've made a deliberate decision, based on what this climate does to natural wood siding over time, to install only James Hardie fiber cement. That's a professional standard we set for our own work, not a knock on every cedar-clad home out there.
If you're weighing siding options for a home in Semiahmoo or elsewhere in Whatcom County, we're happy to take a look at your specific exposure — sun, shade, moss risk, wind off the water — and give you a straight answer. Reach out for a free, no-pressure estimate.