Blaine Exterior Cedar Siding Looks Great in the Showroom. Whatcom County Weather Has Other Plans.
Cedar siding has a real appeal. It's a natural material, it smells good on install day, and a freshly stained cedar home has a warmth that manufactured products struggle to match. We understand why homeowners in Blaine ask about it. But we don't install cedar siding, and we think you deserve an honest explanation of why — not a sales pitch against it, just the real maintenance math.
Blaine sits right on the water, in the path of salt-laden marine air, driving winter rain off the Strait of Georgia, and a moss season that can run from October into May in a shaded, damp Whatcom County lot. Cedar is a wood product. Every one of those conditions works against wood siding's long-term finish and structure. This page walks through what cedar actually requires to look good for the long haul, and why we standardized on James Hardie fiber cement instead.
What Cedar Siding Gets Right
To be fair to the product: cedar has natural rot-resistant oils that outperform most other softwoods, it takes stain beautifully, and it's a renewable material with a genuine cottage or craftsman look that some homeowners specifically want. Old-growth cedar, installed well and maintained religiously, can last decades. None of that is in dispute.
The issue isn't whether cedar can perform — it's what "maintained religiously" actually costs a homeowner in time, money, and vigilance, especially in a coastal Pacific Northwest climate like Blaine's.
Where the Trade-Offs Start
- Cedar is a wood product — it expands, contracts, and moves with moisture, which stresses fasteners, joints, and finish over time.
- Finish (stain or paint) is a maintenance system, not a one-time install — it's the only thing standing between the wood and the weather.
- Cedar's rot resistance is real but not unlimited — sustained moisture contact, especially at grade or in shaded areas, will eventually win.
- Every board is a slightly different piece of wood, so knots, grain, and moisture content vary — installation quality matters more than with a uniform manufactured product.
Salt Air: The Quiet Finish-Killer
Blaine's location on Semiahmoo Bay means homes here get regular exposure to salt-laden air moving in off the water. Salt is hygroscopic — it pulls moisture out of the air and holds it against whatever surface it settles on. On cedar, that means the finish coat is under more constant moisture stress than it would be even a few miles inland. Stain and clear coats break down faster under this kind of exposure, and once the finish starts to fail, the bare wood underneath is exposed to the same salt-moist air with no protection.
This isn't a defect in the cedar — it's just what coastal exposure does to any finished wood product. It's also why a lot of the older cedar-sided homes we see around Blaine and Semiahmoo have a visibly patchy, weathered look on their water-facing elevations well before the rest of the house shows the same wear.
Driving Rain and the Moisture Problem
Whatcom County's winter storms don't just drop rain straight down — wind-driven rain off the Strait hits siding at an angle, which means water gets forced into laps, joints, and any gap where the finish has thinned or a fastener has backed out slightly. Cedar's natural resistance helps it shed moisture better than some woods, but "resistance" isn't "immunity." Once water gets behind a board or into an end grain, wood siding holds that moisture far longer than a fiber cement product would, and that's where rot gets started from the inside, often invisible until a board is already compromised.
Board ends, butt joints, and any spot where the original caulking or finish has failed are the highest-risk points. On a wood-sided home, those need to be inspected — not just glanced at — every year.
Moss Season: Longer Here Than Most Homeowners Expect
Between the marine humidity, tree cover common on Whatcom County lots, and a wet season that stretches well past what people from drier climates expect, moss and algae growth on north-facing and shaded siding is close to a given over time. On cedar, that's more than cosmetic. Moss holds moisture directly against the wood and the finish, extending the time the surface stays wet after every rain event. That accelerates both finish breakdown and the risk of rot underneath. Cleaning moss off cedar siding without damaging the finish takes a gentle touch — pressure washing wood siding aggressively can drive water into joints and strip finish faster than the moss was damaging it.
The Real Maintenance Schedule
Here's what keeping cedar siding looking good actually requires, realistically, in a Blaine climate:
| Task | Typical Frequency | Why It Matters Here |
|---|---|---|
| Visual inspection for finish wear, gaps, soft spots | Annually, ideally each fall | Catches finish failure before wood is exposed through winter storms |
| Moss and algae removal (gentle, hand or soft-wash) | 1-2x per year, more on shaded elevations | Long moss season here means growth returns quickly without upkeep |
| Re-stain or reseal | Every 2-4 years (solid stain lasts longer than semi-transparent) | Salt air and UV both shorten finish life versus inland climates |
| Caulk and joint check | Annually | Driving rain finds any gap; failed caulk is a direct path to rot |
| Full repaint/restain (if paint-finished) | Every 5-8 years | Coastal exposure accelerates paint failure versus regional averages |
None of these tasks are unusual for wood siding in general — but the frequency is higher here than it would be for the same product in a drier, inland climate, and skipping a cycle has real consequences given how much moisture this area sees.
What It Costs to Skip a Cycle
The risk with any maintenance-dependent siding isn't the maintenance itself — it's what happens when it gets deferred. A missed re-stain cycle doesn't show damage right away; the wood looks a little duller, maybe a little gray in spots, but it's usually still structurally fine. The problem is that the finish is now compromised while the homeowner doesn't yet see a reason for concern. By the time soft spots, cupping boards, or visible rot show up, moisture has typically been getting behind the finish for a season or more, and the fix is no longer "re-stain" — it's board replacement, sometimes with sheathing repair behind it.
This is the core trade-off with cedar: the consequences of deferred maintenance are hidden until they're expensive, and the maintenance schedule required to avoid that in a marine climate is more demanding than most homeowners plan for when they choose the product for its looks.
Why We Standardized on James Hardie Instead
We made a decision as a company to install James Hardie fiber cement siding exclusively, and cedar's maintenance profile is a big part of why. Fiber cement is engineered, not grown — it's dimensionally stable, doesn't expand and contract with moisture the way wood does, and it's non-combustible. Hardie's HZ5 product line is specifically engineered for climates with sustained moisture exposure, which describes Blaine and the rest of Whatcom County well.
The bigger difference is the finish. Hardie's ColorPlus factory-applied finish is baked on under controlled conditions, not brushed on in the field, and it carries its own multi-year warranty against fading and wear. That means no re-staining cycle, no annual finish inspection tied to warranty coverage, and a finish that isn't fighting an uneven fight against salt air from day one. Combined with Hardie's transferable product warranty, it's a siding system built for exactly the coastal, wet, moss-prone conditions that make cedar such a demanding product to own here.
We're not saying cedar is a bad material — it's a real product with real upkeep requirements that make sense for some homeowners in some climates. We're saying that after years of doing exterior work in this specific climate, we don't think it's the right long-term investment for most homes here, and we'd rather install something we can stand behind without an asterisk about maintenance discipline.
Questions Worth Asking Before You Choose a Siding Product
- What does the manufacturer's warranty actually cover, and does it require documented maintenance to stay valid?
- How does this product perform specifically in marine/coastal exposure, not just "Pacific Northwest" in general?
- What's the realistic re-finishing interval, and what does that cost over 20 years compared to the install cost?
- Who is responsible for board-level repairs if moisture damage shows up in year 8 or 12?
- Does the installer have a documented, climate-specific reason for the product they're recommending?
If you're weighing siding options for a Blaine home, we're happy to walk your property, talk through what your specific exposure looks like — sun, shade, wind direction, tree cover — and give you a straight, no-pressure estimate on a James Hardie system built for it.