Lynden Siding One Product, No Exceptions — Here's Why
Walk into most siding companies in Whatcom County and you'll get a menu: vinyl if you're on a budget, LP SmartSide if you want something in between, fiber cement if you want the best. We don't offer that menu. Every home we side gets James Hardie fiber cement, full stop. That's not a sales gimmick — it's a decision we made after years of watching which products actually held up in this specific corner of Washington, and which ones we kept getting called back to repair.
Lynden sits inland from Bellingham Bay and the Strait of Georgia, close enough that salt-laden air still reaches siding, roofing, and trim on a regular basis. Add the driving rain that comes through the Nooksack Valley in fall and winter, plus a moss season that can run six months or longer on north-facing walls, and you've got a climate that's genuinely hard on exterior materials. Standardizing on one product lets us get very good at installing it correctly, stock the right accessories and fasteners, and stand behind the work without hedging.
What James Hardie Fiber Cement Actually Is
Fiber cement siding is a mix of Portland cement, sand, cellulose fiber, and water, cured under pressure and heat into a dense, stable board. It's not a coating over foam, and it's not a wood-composite product. It's closer in nature to masonry than to lumber, which is exactly why it behaves so differently from wood-based or vinyl siding in wet, salty, moss-prone conditions.
Why the Composition Matters Here
Wood fiber and engineered wood products absorb moisture and swell, which is a real problem when a wall assembly stays damp for days at a stretch — common during a typical Whatcom County winter. Fiber cement's cement matrix doesn't swell the way wood does, and it doesn't provide the organic material that moss and mildew feed on the way bare or lightly coated wood does. It still needs to be installed with correct clearances and drainage — no siding product is maintenance-free — but the base material starts from a much more forgiving position.
Non-Combustible Core
Fiber cement is non-combustible, which matters less for wildfire exposure here than it does for general fire safety and insurance considerations. It's one more reason we don't lose sleep recommending it — there's no asterisk on the fire performance the way there is with some engineered wood products.
The HZ Climate-Engineered System
James Hardie doesn't sell one universal product nationwide. Their HZ5 formulation is engineered for wetter, harsher climates — the Pacific Northwest included — with a moisture and freeze-thaw profile tuned for regions that see a lot of rain and swing through damp cold snaps. That's the version we install in Lynden. It's a small detail most homeowners never hear about, but it's the difference between a product that's merely durable on paper and one that's actually formulated for the weather sitting outside your window right now.
The Product Lines We Install
"James Hardie" isn't one board — it's a system of products designed to work together, and matching the right line to the right part of the house is part of doing the job correctly.
| Product | What It's For | Common Use on Lynden Homes |
|---|---|---|
| HardiePlank | Lap siding, the primary wall covering | Main field siding on most single-family homes |
| HardiePanel | Vertical panel siding | Gable accents, modern/farmhouse styling, shop and barn-style buildings |
| HardieShingle | Staggered or straight-edge shingle profile | Accent gables, dormers, craftsman-style detailing |
| HardieTrim | Fascia, corner boards, window and door trim | Trim package to match the field siding — same material, same durability |
| HardieSoffit | Vented and non-vented soffit panels | Attic and roofline ventilation paired with the wall system |
We don't mix a Hardie field with a cheaper trim package just to shave cost off a bid. Trim boards take more direct rain exposure than flat wall area, and mismatched materials age at different rates — which is exactly the kind of thing that makes a ten-year-old house look patchy.
Board Profiles and Textures
Within HardiePlank you're choosing a width (typically 5.25" to 8.25" exposure) and a texture — smooth or a cedar-grain finish. Smooth reads more modern and contemporary; cedar-grain mimics traditional lap siding and tends to suit the farmhouse and craftsman styles common around Lynden and the surrounding Whatcom County countryside. Neither texture affects durability — it's purely an aesthetic call.
ColorPlus Finish — Why It's Not Just Paint
This is one of the biggest practical differences between Hardie and a product you paint yourself on site. ColorPlus is a multi-coat, baked-on finish applied at the factory under controlled conditions, not brushed or sprayed on a job site where weather, dust, and temperature swings all affect adhesion and cure quality. It's engineered specifically to resist fading, chipping, and cracking, and Hardie backs it with its own dedicated finish warranty separate from the substrate warranty.
In a climate with this much seasonal moisture, a factory-cured finish has a real advantage over field-applied primer-and-paint, which is more sensitive to humidity and temperature at the time of application — conditions you can't always control on a Whatcom County job site in October.
- Factory-applied under controlled temperature and humidity, not field conditions
- Multiple coat layers baked on for adhesion, rather than a single field-sprayed coat
- Backed by a dedicated color/finish warranty, separate from the substrate
- Consistent color and sheen across every board in the order
- Far less repainting over the life of the siding compared to field-finished materials
The Warranty, and What It's Actually Worth
James Hardie's non-primed and ColorPlus products carry long, transferable limited warranties on the substrate, with a separate finish warranty on ColorPlus color. Transferability matters more than people expect — if you sell the home, the warranty coverage moves with it, which is a real selling point in a market where buyers are increasingly asking what the exterior is made of and when it was last replaced.
A warranty is only as good as the installation behind it, though. Manufacturer warranties on fiber cement generally require installation to the manufacturer's published specifications — correct fastener type and spacing, correct clearances above grade and roofing, correct flashing and caulking details. Skip those and you can void coverage even on a product that's otherwise excellent. That's the other half of why we only install Hardie: we know its install spec cold, and we follow it every time, so the warranty you're paying for is actually intact if you ever need it.
What Correct Installation Actually Involves
Fiber cement is not a forgiving product to install wrong. It's heavier than vinyl, needs specific blade types to cut without excessive dust, and has clearance and fastening requirements that get skipped more often than most homeowners realize.
- Minimum clearance from grade, roofing, decks, and patios to prevent wicking moisture
- Correct fastener type, length, and spacing driven per manufacturer spec, not just "close enough"
- Proper house wrap or weather-resistant barrier behind the siding, with correct lap and taping
- Rainscreen or drainage gap detailing where conditions call for it, especially on north and west-facing walls that hold moisture longest
- Factory-cut and factory-primed cut ends caulked and sealed, not left raw
- Flashing at every window, door, and roof intersection — the single most common failure point on any siding job, regardless of material
Most of the fiber cement failures we get called to look at aren't a material problem — they're an installation shortcut that let moisture behind the board. That's a people problem, not a product problem, and it's the same reason we'd rather install one product exceptionally well than three products adequately.
Cost Factors Worth Understanding
Fiber cement costs more upfront than vinyl and is generally in a similar range to or somewhat above quality engineered wood siding, depending on trim complexity, board profile, and how much of the home's existing sheathing and wrap needs replacing. The bigger financial picture is the repaint and repair cycle, not just the install price.
| Factor | What Drives It |
|---|---|
| Board profile and texture | Smooth vs. cedar-grain, standard vs. wider exposure widths |
| Trim package | Whether trim, fascia, and soffit are matched Hardie products or left as-is |
| Existing wall condition | Rot repair, sheathing replacement, and house wrap needed before siding goes on |
| Home geometry | Number of gables, dormers, and cut angles that add labor and waste |
| Finish choice | Factory ColorPlus vs. primed boards that require field painting |
Why This Matters More in Whatcom County Than It Might Elsewhere
Inland cities don't deal with the same combination of factors Lynden does — salt-tinged marine air drifting in off the Strait, sustained autumn and winter rain, and long stretches of shaded, damp walls where moss gets a foothold and doesn't let go until summer. A siding product that performs fine in a dry Eastern Washington climate can struggle here, and a lot of the maintenance complaints we hear about other materials trace straight back to that mismatch. Choosing a climate-engineered fiber cement system isn't overkill for this area — it's matching the product to the actual conditions the siding has to survive, year after year.
If you're planning a siding project in Lynden or anywhere else in Whatcom County, we're happy to walk your home, look at what's there now, and put together a free, no-pressure estimate for a James Hardie system built for this climate.