Birch Bay Why We're Writing This
Cedar siding shows up a lot in conversations with Birch Bay homeowners, especially on older homes near the water or anyone drawn to the look of natural wood grain. It's a real, respected material with a long history in the Pacific Northwest, and there's nothing wrong with liking how it looks. But we don't install it, and we think homeowners deserve a straight explanation of why — not a sales pitch against it, just an honest look at what cedar actually demands once it's on a wall in Whatcom County's salt air, driving rain, and long moss season.
This page isn't about telling you cedar is a bad product. It's about telling you what owning cedar siding in this specific location actually involves, year after year, so you can weigh that against the alternatives with real information instead of a showroom sample.
What Cedar Gets Right
Cedar has natural oils that give it some built-in resistance to decay and insects, which is part of why it's been used on Northwest homes for generations. It's a renewable material, it takes stain and finish well when properly prepped, and the grain pattern is genuinely beautiful in a way that manufactured products spend a lot of effort trying to replicate. When cedar siding is installed correctly — back-primed, properly flashed, and finished with a quality product — and then maintained on a strict schedule, it can look great and perform reasonably well for years.
That last part, the strict schedule, is the whole issue. Cedar's performance is directly tied to how consistently it's maintained, more so than most other siding materials on the market. It doesn't fail quietly if you skip a year here or there. It tells you.
How Wood Actually Behaves on a Wall
It Moves With Moisture
Cedar is a hygroscopic material, meaning it absorbs and releases moisture from the air constantly. In a climate with the kind of humidity swings Birch Bay sees between wet winters and drier summer stretches, that means the boards are expanding and contracting all year. Over time, that movement stresses fasteners, opens hairline cracks in the finish, and can telegraph into cupping or checking at board edges, especially on south and west-facing walls that get the most sun-to-rain cycling.
Salt Air Speeds Up the Clock
Birch Bay's shoreline exposure adds a layer most inland Whatcom County homes don't deal with. Salt-laden air accelerates finish breakdown on wood siding, and it's harder on any exposed fasteners or metal flashing details tied into the siding system. A cedar finish that might hold up for four or five years further inland can start showing UV and salt wear noticeably sooner on a home with direct or near-direct water exposure.
Moss Doesn't Stay on the Roof
Whatcom County's long wet season is exactly the environment moss and algae favor, and it's not just a roof problem. North-facing walls, areas under eaves, and anywhere siding stays shaded and damp for long stretches can develop moss and mildew growth on wood siding, particularly where the finish has started to thin. Once organic growth gets a foothold in wood grain, it holds moisture against the board and makes the underlying decay problem worse, not just the cosmetic one.
The Maintenance Cedar Actually Requires
This is the part that doesn't always come up until a homeowner is a few years into ownership. Cedar siding isn't a paint-it-once-and-forget-it product. To hold its protective finish and resist moisture intrusion, it typically needs:
- Refinishing (staining or repainting) on a cycle of roughly every 3 to 7 years depending on exposure, finish quality, and orientation — south and west walls usually need it sooner
- Annual or semi-annual washing to remove pollen, salt residue, and early moss or mildew growth before it embeds in the grain
- Caulk inspection and renewal at butt joints, corners, and trim intersections, since failed caulk is one of the most common entry points for moisture
- Prompt attention to any cupped, split, or checked boards, since a compromised board allows water behind the siding plane
- Periodic inspection of fasteners, which can back out or corrode over time, particularly in salt air
- Vegetation and landscaping management to keep sprinklers, shrubs, and shaded plantings from holding moisture against the wall
None of these tasks are unreasonable on their own. The issue is that they're not optional, and they don't pause because a homeowner is busy, traveling, or simply didn't get to it that year. Skip a refinishing cycle or two, and cedar doesn't just look a little tired — it starts absorbing moisture past the compromised finish, which is where real problems begin.
What Happens When Maintenance Falls Behind
We've talked to enough homeowners around Birch Bay and the surrounding shoreline to know how this usually plays out. A home gets built or re-sided with cedar, the finish holds up fine for the first several years, and then life happens — a move, a new owner who doesn't know the maintenance history, a stretch where refinishing gets pushed back. By the time the finish failure becomes visually obvious, moisture has often already been working on the wood underneath for a season or two.
Once cedar starts to decay, the fix generally isn't a touch-up. Rotted or heavily checked boards need to be cut out and replaced, which means matching aged cedar (not always simple), refinishing the repair to blend with weathered boards nearby, and re-checking flashing and house wrap behind the removed section for hidden water damage. It's a bigger job than the annual maintenance would have been, and it tends to arrive at the worst possible time — after the damage is already visible.
Cedar Compared to the Alternatives
To be fair to cedar, it's worth putting its maintenance profile next to the other products we get asked about, including the one we actually install.
| Material | Moisture Behavior | Maintenance Cycle | Salt Air / Moss Resistance |
|---|---|---|---|
| Cedar (natural wood) | Absorbs and releases moisture readily; moves with humidity swings | Refinish every 3-7 years; regular washing and caulk checks | Vulnerable without consistent upkeep; finish breaks down faster near water |
| Primed spruce / engineered wood | Wood-based core sensitive at cut edges and fastener points | Similar refinishing burden; edge sealing is critical | Prone to swelling and edge deterioration if maintenance lapses |
| Vinyl siding | Doesn't absorb moisture, but panels flex and can trap moisture behind them | Low; occasional washing | Can fade, warp, or crack under UV and temperature swings; not repaintable |
| James Hardie fiber cement | Non-combustible, dimensionally stable; engineered to resist moisture-related swelling | Occasional washing; factory ColorPlus finish holds color without repainting on the manufacturer's schedule | Built for moisture, freeze-thaw, and UV exposure; not a food source for moss or mildew the way wood is |
Every material on that table has a legitimate place in the market, and plenty of homeowners are satisfied with each one. Vinyl's low maintenance comes with trade-offs in appearance and repairability. Engineered wood products share some of cedar's moisture sensitivity at cut edges. Cedar's trade-off is specifically the ongoing labor and cost of keeping its finish intact in a climate that works against that finish year-round.
Why We Standardized on James Hardie Instead
We install James Hardie fiber cement siding exclusively, and cedar is one of the products this decision was built around. Hardie's HZ5 product line is engineered for the kind of moisture and climate cycling that's normal in Western Washington, and the factory-applied ColorPlus finish is baked on under controlled conditions rather than applied on-site and exposed to weather before it fully cures. Fiber cement doesn't expand and contract with humidity the way solid wood does, it isn't a food source for moss and mildew, and it's non-combustible, which matters on top of everything else.
None of that makes cedar a bad choice for every homeowner. It makes Hardie the product we're willing to put our name behind for Birch Bay's specific mix of salt air, driving rain, and moss season, and it's why we stopped installing cedar even though we understand why people are drawn to it.
What Correct Hardie Installation Looks Like
Choosing Hardie doesn't remove the importance of installation quality — it shifts what matters. Proper flashing at windows, doors, and penetrations, correct fastener spacing and type, appropriate clearance from grade and hardscaping, and factory-mitered or properly caulked joints all still matter for long-term performance. A poorly installed Hardie job can still let water in behind the siding plane. The material's durability is only half the equation; installation to the manufacturer's specifications is the other half.
A Practical Checklist If You Currently Have Cedar
If your Birch Bay home already has cedar siding and you're not ready to replace it, here's what actually protects it in this climate:
- Walk the exterior twice a year, spring and fall, looking specifically for finish thinning, cupped boards, and moss starting to take hold on shaded walls
- Wash the siding annually with a low-pressure method to remove salt residue and organic growth before it embeds
- Budget for refinishing on a real schedule, not "whenever it looks bad" — by the time it looks bad, the finish has often already failed
- Check and re-caulk joints, especially around trim, corners, and any penetrations, every couple of years
- Trim back vegetation and adjust irrigation so sprinklers and shaded plantings aren't keeping any section of wall consistently damp
- Address any single damaged or decayed board immediately rather than waiting for a broader refinishing cycle
Making the Decision That's Right for Your Home
Cedar can be a good fit for a homeowner who wants the look of natural wood and is genuinely committed to the maintenance cycle it requires. That's a legitimate choice. What we've found in Whatcom County, and especially on the shoreline exposure around Birch Bay, is that most homeowners underestimate how consistent that maintenance needs to be, and how much harder the salt air and moss season make it compared to a drier, more sheltered location.
If you're weighing cedar against a lower-maintenance option, or you're dealing with an existing cedar exterior that's starting to show its age, we're happy to walk your home with you and give you a straight read on where things stand. If you'd like a free, no-pressure estimate on your siding, use the form below and we'll take a look.