Ferndale Lynden sits inland from the coast, but that doesn't spare it from the weather patterns that define exterior work across Whatcom County. Homes here still take on long stretches of driving rain off the Pacific, damp air that never fully clears through the fall and winter, and a moss season that can run half the year on north-facing walls and shaded lots. Add in the wind that funnels down from the foothills and the salt-tinged air that reaches this far inland on stronger weather systems, and you have a climate that is genuinely hard on exterior siding — even siding that looks fine from the street.
Ferndale Siding installs James Hardie fiber cement siding exclusively. We don't carry vinyl, LP SmartSide, Cemplank, Allura, or bare cedar and spruce products, and we're upfront about why: we've standardized on one system because it holds up to this specific climate when it's installed correctly, and we'd rather be excellent at one product than average at five. This page walks through what that means for a Lynden home specifically — not a generic siding pitch, but the actual considerations that matter for houses in this part of the county.
What Lynden's Climate Actually Does to Siding
Whatcom County's weather is deceptively tough on building exteriors. It's rarely dramatic — no hurricanes, no hail the size of golf balls — but it's relentless. That's a different kind of stress than most siding products are built to handle over the long term.
Moisture Load, Not Just Rainfall
The number that matters isn't how much rain falls in a year — it's how many days the siding stays wet. In Lynden, that count is high. Wood-based products (cedar, primed spruce, and engineered wood siding like LP SmartSide) are dimensionally reactive to moisture: they swell, they dry, they swell again, season after season. Over years, that cycle opens seams, telegraphs through paint, and eventually leads to soft spots, especially at butt joints, corners, and anywhere caulking has started to fail.
Moss and Organic Growth
Shaded elevations, north walls, and anywhere siding sits close to landscaping develop a moss and algae film faster here than in drier climates. On porous or textured wood-fiber surfaces, that growth digs into the material itself, not just the surface — which is part of why pressure washing wood siding can do more harm than good over time. Fiber cement doesn't feed organic growth the way wood-based products do, and a factory-cured finish gives moss and algae less to grip.
Wind-Driven Rain and Salt-Tinged Air
Lynden isn't a coastal town, but it isn't sealed off from coastal weather either. Wind-driven rain events push moisture sideways into wall assemblies, testing every seam, joint, and piece of trim. And on the region's stronger weather systems, salt-laden air reaches well inland — enough to accelerate corrosion on fasteners and hardware that weren't rated for it, and to add another layer of stress to any finish that isn't fully cured and sealed.
Why We Only Install James Hardie
Fiber cement isn't a marketing category — it's a specific material: Portland cement, sand, and cellulose fibers, cured into a rigid, non-combustible board. James Hardie is the manufacturer we've chosen to build on, for reasons that come down to real-world performance rather than brand loyalty.
- Dimensional stability: Fiber cement doesn't expand and contract with moisture the way wood and wood-composite products do, which means seams and joints stay tighter over time.
- Non-combustible: It won't ignite or contribute fuel to a fire the way wood-based siding can — a meaningful factor for insurance underwriting in some cases.
- Factory-applied ColorPlus finish: The color is baked on at the factory under controlled conditions, not brushed or sprayed on site. That produces better adhesion and more even coverage than field-applied paint, and it's backed by its own finish warranty separate from the product warranty.
- Climate-engineered product lines: Hardie makes region-specific formulations (their HZ5 line is engineered for cold, wet, freeze-thaw climates like ours) rather than one generic board sold everywhere.
- Warranty structure: A 30-year, non-prorated, transferable limited warranty on the substrate — meaning it doesn't degrade in value as it ages, and it transfers to the next owner if the home sells.
We're not going to tell you every other product is junk — LP SmartSide, Cemplank, and Allura all have legitimate use cases, and cedar has real aesthetic appeal for the right owner who's committed to maintaining it. But once we decided to specialize, the trade-offs of those other systems — ongoing maintenance burden, moisture sensitivity, or installation sensitivity that punishes shortcuts — didn't fit what we wanted to stand behind for the long haul in this climate. Hardie, installed to spec, does.
What a Correct Fiber Cement Job Actually Involves
Fiber cement is only as good as its installation. A rushed or under-detailed job on the right material can still fail early — and most of the "siding problems" homeowners run into with fiber cement trace back to installation shortcuts, not the product itself.
The Water Management System Behind the Boards
Siding is the visible layer, but what's behind it does the real work of keeping a wall dry. A correct install includes:
- A weather-resistant barrier (housewrap) installed shingle-style, lapped correctly at every seam
- Proper flashing at every window, door, and roof-to-wall intersection — the single most common failure point on poorly installed siding
- A rainscreen gap (furring strips or a drainage mat) that lets any moisture that does get behind the siding drain and dry out instead of sitting against the sheathing
- Correctly sized and located weep points at the bottom of wall assemblies
Fastening and Clearances
James Hardie's installation manual specifies fastener type, spacing, and penetration depth — and those specs aren't optional if you want the warranty to stay valid. Equally important are the clearances most homeowners never think about: siding held above grade, above roof lines, and above decks and patios, so it never sits in standing water or gets buried by mulch and landscaping over time.
Caulking and Joint Treatment
Butt joints, corners, and penetrations need the right sealant, applied correctly — not just enough to hide the seam. Overuse of caulk as a substitute for proper flashing is one of the most common shortcuts we see when we're called in to look at another contractor's work.
| Install Element | Why It Matters in Lynden |
|---|---|
| Rainscreen gap | Lets wind-driven rain that gets behind the siding drain and dry instead of soaking the sheathing |
| Flashing at penetrations | Prevents the wall assembly's most common leak points from ever becoming leaks |
| Correct fastener spec | Keeps boards secure through wind events and freeze-thaw cycles without popping or splitting |
| Grade and surface clearances | Keeps siding out of standing moisture and prolonged dampness that drives moss growth |
| Factory-cured ColorPlus finish | Resists moss and algae adhesion better than field-applied paint on porous surfaces |
Our Process for a Lynden Project
Every job follows the same sequence, whether it's a single wall repair or a full re-side:
- On-site assessment: We look at the existing siding, the wall assembly behind it where accessible, moisture-prone areas (shaded elevations, ground contact points, deck and roof intersections), and any signs of past water intrusion.
- Written scope and product selection: We walk through Hardie's plank, panel, and shingle profiles and the HZ5 climate-zone product, and put the full scope — tear-off, water management details, fastening, and trim — in writing before any work starts.
- Tear-off and substrate check: Old siding comes off and we inspect the sheathing underneath for rot or damage before anything new goes up. Problems found here get addressed, not covered.
- Water management installation: Housewrap, flashing, and rainscreen components go in first, correctly lapped and sealed at every transition.
- Siding installation to manufacturer spec: Fastening, spacing, and clearances follow James Hardie's published installation guidelines, which is also what keeps the product warranty intact.
- Final walkthrough: We go over the finished work with the homeowner before calling the job done.
Why Hiring a Crew That Already Works This Area Matters
Siding installation isn't regionally generic. A crew that mostly works drier climates can install fiber cement competently and still get the water management details wrong for a place like Lynden, because the assumptions that hold up in a dry climate don't hold up here. Knowing which elevations need the most attention to moss and shade, how much clearance actually matters given how wet the ground stays through winter, and how wind-driven rain behaves against a wall in this specific area comes from doing the work here repeatedly — not from a manual alone.
There's also a practical service argument: a local crew can respond quickly if something needs a look after a storm, honor warranty callbacks without a long drive, and knows the permitting and inspection expectations in Whatcom County without a learning curve.
What to Check Before Hiring Any Siding Contractor
- Are they James Hardie certified, or at minimum, can they explain the manufacturer's installation spec in detail without hesitating?
- Will they put the full water management plan (housewrap, flashing, rainscreen) in writing, not just the visible siding?
- Do they inspect and address sheathing damage during tear-off, rather than just covering over it?
- Can they explain fastener spec and clearance requirements specific to your home's elevations?
- Do they carry current liability insurance and workers' compensation coverage?
- Will they provide a written scope and timeline before any deposit changes hands?
Cost Factors for a Lynden Fiber Cement Project
Every home is different, so we won't quote a number without seeing the job — but the factors that move the price are consistent:
| Factor | Impact |
|---|---|
| Tear-off condition | Rot or damaged sheathing found during removal adds repair scope before new siding goes up |
| Home size and wall complexity | More corners, dormers, and trim details mean more labor and material cuts |
| Product profile chosen | Lap siding, shingle-style panels, and board-and-batten carry different material and labor costs |
| Access and site conditions | Multi-story walls, tight lot lines, or landscaping that limits equipment access add time |
| Trim and accessory scope | Fascia, soffit, and trim replacement alongside the siding changes total project cost |
Get a Free Estimate
If your Lynden home's siding is showing moss buildup, soft spots, peeling paint, or seams that have opened up over the years, it's worth a straightforward look before winter's wet season sets in again. We'll assess the current siding and wall assembly, explain what we find, and put together a clear, no-pressure estimate for a James Hardie fiber cement install built for this climate — no obligation to move forward.