Bellingham Siding Cedar Siding Looks Great in the Showroom. Whatcom County Is Not a Showroom.
Cedar siding has a real appeal. It's a genuine wood product, it takes stain beautifully, and there's a warmth to a cedar-clad home that manufactured products spend a lot of marketing money trying to imitate. We're not going to pretend otherwise. If you've got a cabin-style home near Lake Whatcom or a craftsman in the York neighborhood, cedar can look right at home.
But we're a Bellingham siding contractor, and Bellingham is not a dry climate. Between the marine air rolling off Bellingham Bay, the driving rain that hits west- and south-facing walls all winter, and a moss season that can run eight or nine months out of the year, cedar siding here has to work a lot harder to stay looking good than it would in, say, eastern Washington. This page is about what that work actually looks like, so you can decide with clear eyes — not sales-brochure eyes — whether cedar is right for your house.
What Cedar Gets Right
Western red cedar is naturally rot-resistant compared to most other softwoods, thanks to oils in the wood that discourage decay and some insects. It's lightweight, it's a renewable material, and it has genuine dimensional stability when it's properly milled and finished. Cedar shingles and cedar lap siding have been used on Pacific Northwest homes for well over a century, and plenty of those homes are still standing. When cedar is installed correctly, finished correctly, and maintained on schedule, it can perform well for decades.
The catch is in that last sentence: correctly, correctly, and on schedule. Cedar's performance is a maintenance-dependent performance, not a install-it-and-forget-it performance. That's the trade-off homeowners need to understand before they commit to it.
Why Whatcom County Climate Matters Specifically
Cedar's natural rot resistance is a relative advantage over other bare woods — it is not waterproofing. Wood is still hygroscopic: it absorbs and releases moisture with the weather. In a climate with long dry stretches and occasional rain, that cycle is manageable. In Bellingham, where marine humidity keeps wood damp for long periods and true drying windows can be scarce from October through May, cedar siding spends a lot more of the year holding moisture near its saturation point than it would in a drier region. That's the mechanism behind almost every maintenance issue described below.
The Maintenance Reality, Section by Section
Refinishing Is Not Optional — It's a Recurring Job
Whether you stain or paint cedar, the finish is a sacrificial layer that UV light and moisture slowly break down. In most climates, a semi-transparent stain needs reapplication every 3-5 years and paint every 5-7. In Bellingham's wetter, greyer climate, we typically see homeowners on the shorter end of those windows, sometimes tighter on sun-exposed south and west elevations where UV and wind-driven rain both concentrate. Skip a cycle and you're not just touching up color — you're often stripping, sanding, and re-priming bare wood that's already started to weather unevenly.
Moss, Algae, and Mildew Are a Standing Appointment
This is the one that catches people most off guard. Whatcom County's moss season isn't a two-week nuisance — shaded, north-facing walls, siding under overhanging trees, and anywhere airflow is poor can host moss and algae growth for most of the year. On cedar, that growth doesn't just look bad; it holds moisture directly against the wood surface, which accelerates the very decay cedar's natural oils are supposed to resist. Left unaddressed, moss-covered cedar can develop soft spots, staining, and in the worst cases, structural softening of boards within a handful of years. Cleaning it off means soft washing (never high-pressure washing directly into the grain) on a recurring schedule, plus keeping vegetation trimmed back from the walls.
Caulking, Sealing, and Joint Maintenance
Cedar lap and shingle siding relies on caulked joints, end grain sealing, and properly lapped courses to shed water. Caulk has a service life — typically 5-10 years depending on exposure — and cedar's dimensional movement (expanding and contracting with moisture) stresses those joints faster than a more stable material would. End grain, at butt joints and around windows and trim, is the most vulnerable point on the whole wall; if it isn't sealed and re-sealed, it wicks water like a straw.
Salt Air and Fasteners
Homes closer to Bellingham Bay and the water get an added factor: salt-laden air accelerates corrosion on fasteners and any exposed metal flashing. Corroding nail heads bleed rust streaks into cedar and, over time, lose their grip, which lets boards work loose. Stainless steel fasteners help, but they add cost, and older cedar installations in the area were often done with galvanized nails that weren't built for a lifetime of salt exposure.
What Happens When Maintenance Slips
We're not describing a worst-case scenario here — this is the ordinary lifecycle of unmaintained or under-maintained cedar in this climate:
- Finish fades and chalks, then cracks and peels, exposing bare wood to direct moisture cycling
- Moss and algae colonize shaded and low-airflow areas, trapping moisture against the surface
- Boards begin to cup, split, or check as they repeatedly swell and dry unevenly
- Water intrudes at open joints, fastener holes, and unsealed end grain
- Soft, rotted sections appear, usually first at the bottom courses, around penetrations, and under windows
- Localized board replacement becomes necessary, which rarely matches the weathered color of surrounding boards
None of this means cedar is a bad material. It means cedar is an ongoing commitment, and the interval between "looks great" and "needs real attention" is shorter here than it is in drier parts of the state.
The Real Cost Picture
The sticker price on cedar siding installation is often competitive with — sometimes cheaper than — fiber cement. Where the comparison changes is over the ownership period. Here's the honest breakdown of what typically factors into total cost of ownership for cedar versus James Hardie fiber cement in this climate:
| Factor | Cedar Siding | James Hardie Fiber Cement |
|---|---|---|
| Initial finish | Field-applied stain or paint, exposed to weather during cure | Factory-baked ColorPlus finish, cured before install |
| Refinishing cycle | Every 3-7 years depending on exposure and product | ColorPlus warranted 15 years against finish failure; no routine refinishing |
| Moss/algae vulnerability | High — organic material moss and algae can colonize; growth accelerates decay | Low — inorganic cement substrate doesn't feed fungal or moss growth the way wood does |
| Moisture response | Absorbs, swells, and dries with weather cycles | Engineered for dimensional stability in wet climates (HZ5 product line) |
| Fire rating | Combustible | Non-combustible fiber cement |
| Typical labor over 30 years | Multiple refinishing and repair cycles | Occasional cleaning; no refinishing cycle under normal conditions |
Where Cedar Still Makes Sense
We'll say this plainly: cedar isn't wrong for every home. If you specifically want the look of natural wood grain, you're committed to a real maintenance schedule (or budget for a contractor to handle it), and you understand the lifecycle costs above going in, cedar can be a reasonable choice — especially for accent areas, gables, or smaller architectural features where the maintenance burden is contained to a manageable footprint. Where it becomes a problem is when it's installed as full-house siding by homeowners who expect vinyl-level or fiber-cement-level maintenance intervals and get cedar-level intervals instead.
Why We Install James Hardie Instead
As a company, we made the call to install James Hardie fiber cement exclusively, and cedar's maintenance profile is a big part of why. Hardie's HZ5 product line is engineered specifically for wet, moisture-heavy climates like ours. The ColorPlus factory finish is baked on under controlled conditions — not applied in the field where weather and temperature swing the outcome — and it carries a 15-year warranty against fading and peeling. Fiber cement is non-combustible, dimensionally stable, and doesn't feed the moss and algae growth that plagues bare or finished wood in this region. It's also backed by a transferable limited warranty that holds up over long ownership periods, which matters in a market where homes change hands.
We're not saying this to knock cedar as a material — old-growth western red cedar earned its reputation honestly. We're saying it because our job is to put something on your walls that still looks and performs well after fifteen winters of Bellingham rain, without asking you to run a recurring maintenance program just to keep it from failing early. For our clients, that's Hardie.
A Practical Checklist If You're Still Considering Cedar
- Get a straight answer on refinishing intervals for your specific product and exposure, not a generic "every few years"
- Ask what fastener material will be used, especially if you're within a few miles of the water
- Confirm end-grain sealing and joint detailing will be done to spec, not left to caulk alone
- Budget for soft washing and moss removal as a recurring line item, not a one-time cleanup
- Walk the property and note shaded, low-airflow wall sections — those will need the closest attention
- Get the total cost of ownership in writing, not just the install quote
If you're weighing cedar against fiber cement for a Bellingham home, we're happy to walk your property, point out the wall sections that would be hardest to maintain, and give you a straightforward, no-pressure estimate on what a James Hardie installation would look like instead. Fill out the form below to get started.