Bellingham Exterior Cedar siding has a real fan base in Whatcom County, and it's easy to see why. It's a genuinely beautiful, natural material with a warm look that vinyl and fiber cement have spent decades trying to imitate. We get asked about cedar often enough that it's worth a straight answer: here's what cedar actually asks of a homeowner in this climate, and why we chose not to install it.
What Cedar Gets Right
Western red cedar is a legitimately good building material. It's naturally resistant to rot and insects thanks to the tannins and oils in the wood, it's lightweight, it takes stain and paint well, and it has a grain and texture that no manufactured product fully replicates. In a dry climate with an owner committed to upkeep, cedar can look great for a long time. None of that is in dispute.
The problem isn't the wood. It's what happens to that wood once it's nailed to a wall in Bellingham and left to face our specific weather, year after year, for the life of the house.
Why Our Climate Is Hard on Cedar Specifically
Salt Air and Marine Moisture
Bellingham sits right on Bellingham Bay, and a lot of the homes we work on are close enough to the water to catch salt-laden air on a regular basis. Salt is hygroscopic — it pulls moisture out of the air and holds it against whatever surface it lands on. On wood siding, that means the surface stays damp longer after a storm, which is exactly the condition that lets mildew, mold, and eventually rot get a foothold.
Driving Rain
Whatcom County doesn't just get a lot of rain, it gets a lot of wind-driven rain off the Sound and the Strait. That matters because cedar's performance depends heavily on end grain and lap joints staying sealed. Driving rain finds the seams, laps, and butt joints that vertical rain never would, and once water gets behind a board, cedar's natural rot resistance doesn't help much — the coating and caulking are doing the real work at that point, and they need to be maintained on schedule.
The Long Moss Season
Between the marine humidity and the shade from mature trees on a lot of Bellingham properties, moss and algae growth on north-facing and shaded walls is close to a year-round condition here rather than a seasonal one. Moss holds moisture against the wood surface, and the acids it produces slowly break down finishes. A wall that would need a wash-down once a year in a drier climate can need attention two or three times a year here.
What Cedar Maintenance Actually Looks Like
This is the part that gets glossed over in marketing but matters most to a homeowner's actual calendar and budget. Cedar isn't "install it and forget it" — it's a coating system on top of a wood substrate, and the coating is what's protecting the wood.
- Re-stain or re-seal every 3-5 years for solid-body stain, sometimes sooner on south and west exposures that get more UV, and sooner still on walls that stay damp from shade or salt air
- Annual or semi-annual wash-down to remove moss, algae, and mildew before they stain or degrade the finish
- Regular caulk inspection at butt joints, trim, and penetrations — cedar moves seasonally and caulk fails faster than most owners expect
- Prompt repair of any board showing soft spots, cupping, or checking, since rot spreads to neighboring boards once it starts
- Keeping vegetation and sprinklers pulled back from walls to reduce constant moisture contact
- Repainting (not just touch-up) roughly every 7-10 years if painted rather than stained, with proper prep each time
None of that is unreasonable to ask of a homeowner who wants a wood exterior. It's just a real, recurring obligation — not a one-time cost — and it's one that specifically gets harder in a marine climate with a long wet season.
The Cost Picture Over Time
Cedar's upfront material cost is often competitive with, or even below, fiber cement. The honest comparison has to include what happens after installation, not just the day the siding goes up.
| Factor | Cedar Siding | James Hardie Fiber Cement |
|---|---|---|
| Refinishing cycle | Every 3-5 years (stain/seal) | ColorPlus finish holds 15+ years before repaint consideration |
| Moss/algae vulnerability | High, especially shaded and marine-exposed walls | Low; factory finish and fiber cement composition resist growth much better |
| Rot risk if finish fails | Real risk once moisture penetrates behind coating | Non-combustible fiber cement doesn't rot |
| Fire exposure | Combustible | Non-combustible material |
| Typical warranty | Varies by installer; coating manufacturer warranties don't cover labor | Long transferable manufacturer warranty on the product itself |
| Ongoing labor cost | Recurring wash, stain, and caulk maintenance for the life of the siding | Occasional wash-down; no recoating cycle |
Add up ten or fifteen years of stain, wash-downs, and caulk repair on cedar, and the total cost of ownership usually lands well above what it looked like at install day. That's not a knock on cedar as a material — it's just the math of a coated wood product in a wet marine climate.
Where Cedar Tends to Fail First
When we're called out to look at a cedar-sided home that's showing problems, it's rarely the whole wall at once. It's usually concentrated in predictable spots:
- Lower courses near grade, where splashback and ground moisture keep boards damp longer
- North-facing and tree-shaded elevations, where the finish never fully dries between rains
- Butt joints and trim returns where caulk has aged past its service life
- Areas below gutters or downspouts with a history of overflow or misdirected discharge
- Corners and window trim where end grain is exposed and harder to keep sealed
These are the same trouble spots we see on any wood exterior, but the frequency and speed of onset are higher here than in a drier inland climate, simply because the wood has fewer dry stretches to recover between wet cycles.
Why We Standardized on James Hardie Instead
We made a decision, as a company, to install only James Hardie fiber cement siding — not cedar, not vinyl, not LP SmartSide, not other fiber cement brands. For cedar specifically, the reasoning comes down to matching the product to the actual climate we work in.
Hardie's HZ5 product line is engineered for the kind of moisture and freeze-thaw conditions common in the Pacific Northwest. The fiber cement composition doesn't rot, doesn't feed pests, and doesn't burn, which matters given how much of Whatcom County sits close to trees and brush. The factory-applied ColorPlus finish is baked on under controlled conditions and backed by its own finish warranty, so homeowners aren't relying on a field-applied coat of stain to hold up against salt air and driving rain year after year. And the transferable warranty structure gives a homeowner real protection that follows the house, not just the original owner.
We're not saying cedar is a bad material. We're saying that after years of doing this work in this specific climate — the bay, the rain, the moss — we'd rather stand behind a product that doesn't ask a homeowner to fight the weather every few years just to keep it looking and performing the way it should.
Questions to Ask Before Choosing Any Siding Material
Whatever direction you're leaning, these are worth asking any contractor or manufacturer rep before you commit:
- What's the realistic maintenance schedule for this product in a marine, high-rainfall climate — not the manufacturer's best-case number?
- Who is responsible for the labor cost of refinishing, and is that covered by any warranty?
- Does the warranty cover the material only, or installation defects too, and is it transferable if you sell the home?
- How does this material perform against moss and algae on shaded or north-facing walls specifically?
- What happens to the warranty if the maintenance schedule isn't followed exactly?
A straight answer to all five tells you a lot about whether a product fits a Bellingham exterior, or just fits a showroom sample.
The Bottom Line
Cedar can be a good material in the right setting, with an owner who's genuinely committed to the maintenance calendar it requires. In Bellingham's combination of salt air, driving rain, and a moss season that barely takes a break, that maintenance burden is heavier and more frequent than most homeowners expect going in. That's the honest picture, and it's why our crews install James Hardie fiber cement on every siding project we take on.
If you're weighing cedar, Hardie, or just trying to figure out what's actually going on with your current siding, we're happy to take a look and give you a straight, no-pressure assessment. Use the form below to request a free estimate.