Bellingham Siding A Standard, Not a Sales Pitch
Homeowners sometimes ask why we don't offer a menu of siding brands the way some contractors do. The honest answer is that we looked at what actually holds up on homes in Whatcom County — through wet winters, salt-laden air off Bellingham Bay, and the long stretch of gray, moss-friendly months that define our climate here — and we standardized on one product system: James Hardie fiber cement. We don't install LP SmartSide, vinyl, Cemplank, Allura, primed spruce, or raw cedar. This page explains the reasoning, not to bash the alternatives, but so you understand what you're getting and why.
Every siding product on the market does something well. The question for us isn't "is it a bad product" — it's "does it perform, without babysitting, for 30-plus years on a house fifteen minutes from saltwater with 35-plus inches of annual rainfall and moss creeping across every north-facing surface by February." That's the bar. Fiber cement, specifically James Hardie's engineered version of it, clears it more consistently than anything else we've worked with.
What Bellingham's Climate Actually Does to Siding
Salt Air and Marine Moisture
Bellingham sits on the bay, and even homes several miles inland get some exposure to salt-carrying air, especially on west- and south-facing walls that catch prevailing weather off the water. Salt air accelerates corrosion of fasteners and trim metal, and it keeps siding surfaces damp longer than a dry inland climate would. Any product with seams, laps, or a moisture-sensitive core is going to show that exposure faster.
Driving Rain
Whatcom County doesn't get the heaviest rainfall in the Pacific Northwest, but it gets persistent rain driven sideways by wind off the Strait of Georgia and the bay, which pushes water into laps, seams, and fastener points that a calmer climate wouldn't stress. Siding here needs to shed water actively, not just tolerate the occasional shower.
The Moss Season
From roughly October through April, north- and shade-facing walls in Bellingham stay damp enough, long enough, for moss and algae to take hold on almost any siding surface. This isn't a defect in a product — it's biology. But how a siding material responds to sustained moisture contact underneath that growth is what separates a material that shrugs it off from one that starts to degrade.
Why We Don't Install the Common Alternatives
Vinyl Siding
Vinyl is affordable and low-maintenance in the sense that it doesn't need painting. But it's a thin plastic product that expands and contracts significantly with temperature swings, which loosens fastening over time, and it becomes brittle and prone to cracking in freezing temperatures — something Bellingham sees more of than coastal areas farther south. Vinyl also isn't a great match for the moss and mildew staining common here; the surface texture and seams tend to hold organic growth, and pressure-washing vinyl aggressively enough to clean it can damage or dislodge panels. It's also a petroleum-based product with a melting point low enough to be a real liability near grills, fire pits, or in wildfire-adjacent conditions — a growing concern regionally.
LP SmartSide
LP SmartSide is an engineered wood product — strand board with a resin binder and coating. It performs reasonably well when installation is flawless and maintenance is kept up religiously, but wood-based siding has a fundamentally different relationship with moisture than fiber cement. Any breach in the factory coating — a nail pop, a cut edge left unsealed, caulking that fails at a joint — gives water a path into a wood substrate that can swell, delaminate, or rot from the inside before it's visible from outside. In a climate with Bellingham's rainfall and humidity, that margin for installation error is thinner than we're comfortable with.
Cemplank and Allura
Cemplank and Allura are also fiber cement, and structurally they're closer to Hardie than vinyl or wood-based products are. The differences that matter to us are in the finish system and manufacturer support. James Hardie's ColorPlus finish is a baked-on, multi-coat factory finish backed by its own dedicated warranty against fading and peeling, engineered specifically for its panels' texture and expansion behavior. Warranty structure, regional engineering (see below), and the depth of a manufacturer's installer network and technical support all factor into long-term outcomes — not just the raw material.
Primed Spruce and Raw Cedar
Solid wood siding, primed or raw, is the most maintenance-intensive option of the group. It requires the most frequent repainting or staining, is the most vulnerable to moisture absorption and rot, and is a food source for the kind of fungal and moss growth our climate produces in abundance. Cedar has real aesthetic appeal, and we understand why homeowners are drawn to it, but the ongoing maintenance commitment it demands in a climate like ours is significant, and the failure mode when maintenance lapses — rot — is expensive to fix.
What James Hardie Gets Right
Fiber cement is sand, cement, and cellulose fiber, autoclaved into a dense, stable board. It doesn't absorb water the way wood does, it doesn't expand and contract like vinyl, and it's non-combustible — a real advantage given the wildfire smoke and ember concerns that reach even wetter parts of Washington in late summer now. James Hardie's specific engineering advantages:
- HZ5 climate engineering: Hardie makes region-specific formulations, and the HZ5 line is engineered for freeze-thaw and wet climates like ours, rather than a one-size-fits-all product.
- ColorPlus factory finish: A baked-on finish applied in a controlled factory environment resists fading and chipping better than field-applied paint, and it's backed by its own warranty separate from the substrate warranty.
- Dimensional stability: Fiber cement moves far less with temperature and moisture than wood or vinyl, which means fewer stress points at seams and fasteners over decades.
- Moisture behavior: Even if water does reach the board, fiber cement doesn't swell, rot, or delaminate the way wood-based products can.
- Transferable warranty: Hardie's non-prorated warranty terms and transferability matter to resale value in a way manufacturer reputation for shorter or prorated warranties doesn't match.
Comparing the Options Side by Side
| Material | Moisture Behavior | Maintenance | Combustibility | Typical Lifespan* |
|---|---|---|---|---|
| James Hardie fiber cement | Does not absorb, swell, or rot | Occasional wash; factory finish resists fading | Non-combustible | 30-50+ years |
| Vinyl | Sheds water but seams trap moisture/growth | Low, but brittle in cold and hard to clean aggressively | Combustible, low melting point | 20-30 years |
| LP SmartSide | Vulnerable at breaches in coating/edges | Requires diligent caulk/coating upkeep | Combustible | 20-30 years with maintenance |
| Cemplank / Allura | Similar substrate to Hardie | Depends on finish system used | Non-combustible | 25-40 years |
| Cedar / primed spruce | Absorbs moisture, prone to rot | High — regular refinishing needed | Combustible | 15-30 years with heavy upkeep |
*Lifespan ranges are general industry figures and depend heavily on installation quality, exposure, and maintenance — not guarantees.
Installation Is Where Most Failures Actually Start
It's worth being direct about something: a lot of siding problems attributed to a "bad product" are actually installation problems. Fiber cement is less forgiving of shortcuts than vinyl in some respects — it needs correct fastener placement, proper clearances, and correctly sealed joints — but when installed to Hardie's published specifications, it performs the way it's engineered to. That's true of any product, which is part of why manufacturer and installer track record matters as much as the material itself.
What Correct Hardie Installation Involves
- Proper starter strip and minimum ground clearance to keep the bottom edge away from splashback and standing moisture
- Correct fastener type, spacing, and depth — over-driven or under-driven nails are a common failure point
- Rain screen or drainage plane behind the siding to let incidental moisture escape rather than sit against the wall
- Sealed and properly lapped joints, with factory-cut edges (not field cuts) exposed wherever possible for full ColorPlus coverage
- Correct flashing at windows, doors, and roof intersections — the majority of real-world moisture intrusion happens at these transitions, not through the field of the siding itself
Cost Factors Worth Understanding Upfront
Fiber cement generally costs more upfront than vinyl and is comparable to or somewhat more than engineered wood, largely reflecting the material's density, the factory finish process, and correct installation labor. What we'd ask you to weigh against sticker price:
- Repaint/refinish cycles avoided: ColorPlus finish is designed to go many years longer between refinishing than field-painted wood siding.
- Moisture-driven repair risk: Rot repair on wood-based siding is typically far more expensive than the cost difference would have been at installation.
- Resale and appraisal: Fiber cement with a transferable warranty is generally viewed favorably by buyers and appraisers compared to vinyl or aging wood siding.
- Insurance considerations: Non-combustible siding is increasingly a factor some insurers weigh, particularly as wildfire risk gets reassessed across Washington.
Our Bottom Line
We're not going to tell you vinyl or LP SmartSide are junk — they're not, and plenty of homes wear them fine for years. But we build our reputation on how a house looks and performs fifteen and twenty-five years after we leave the job site, in a climate that includes salt air, driving rain, and months of moss pressure every single year. James Hardie is the product we've found consistently meets that bar with the least maintenance burden and the strongest warranty backing. That's the whole reason behind the standard — not brand loyalty, but a track record we're willing to put our name behind.
If you're weighing siding options for a home in Bellingham or elsewhere in Whatcom County, we're happy to walk your property, look at your exposure and existing siding condition, and give you a straightforward, no-pressure estimate for what a Hardie install would involve and cost.