Sudden Valley Siding Board and batten siding has a strong following in Ferndale, and it's easy to see why. The vertical lines suit the farmhouses, craftsman remodels, and newer builds scattered around this part of Whatcom County, and the deep shadow lines the battens throw give a home real depth instead of a flat wall of siding. But board and batten is also one of the least forgiving siding profiles when it's installed with the wrong material or the wrong technique — and Ferndale's location near the water means the siding on local homes works harder than siding does almost anywhere else in the state.
We install board and batten in Ferndale exclusively in James Hardie fiber cement. This page covers what that means in practice: what the local climate demands from a vertical siding system, what a correct installation actually involves, and why the details matter more here than they would in a drier inland town.
Why Ferndale Is a Tougher Environment Than It Looks
Ferndale sits close enough to the Salish Sea and the Nooksack River delta that salt-laden air is a regular visitor, not an occasional one. Add in the marine layer, the long stretch of wet months typical of Whatcom County, and the shade many mature lots provide, and you get a climate that keeps exterior wood surfaces damp for extended periods. That combination is exactly what drives moss growth, and it's exactly what punishes any siding material that isn't dimensionally stable when it swells and shrinks with moisture.
Board and batten makes this worse before it makes it better. The vertical battens create dozens of extra seams and fastening points compared to horizontal lap siding, and every one of those seams is a place where water can find its way behind the cladding if the installation isn't precise. In a drier climate, sloppy batten spacing or a skipped flashing detail might go unnoticed for years. In Ferndale, moisture finds those gaps fast.
What Salt Air Does Over Time
Salt air accelerates corrosion on exposed fasteners and metal flashing, and it degrades paint and finish coatings faster than inland air does. Siding and trim facing prevailing weather off the water typically show wear years before siding on a sheltered side of the same house. That's not a reason to avoid board and batten — it's a reason to be deliberate about the fastener hardware, the finish, and the flashing details underneath it.
What Moss Season Does to Vertical Siding
Moss needs sustained moisture and shade to establish, and Ferndale's tree cover and marine humidity give it plenty of both. On horizontal lap siding, moss tends to collect along the bottom edge of each course. On board and batten, it collects in the battens themselves and along the narrow reveal where board meets batten — spots that are harder to see from the ground and easy to let go unnoticed. Left alone, moss holds moisture against the siding surface far longer than open air would, which is a problem for any organic or semi-organic material and a non-issue for a properly finished fiber cement panel.
Why We Won't Do Board & Batten in Wood, Vinyl, or LP
Board and batten is available in several materials, and each one has a real trade-off worth knowing about before you commit to it on a Ferndale home.
- Primed spruce or cedar board and batten looks great on day one, but real wood moves with humidity, and in a climate that stays damp as long as Ferndale's does, that movement shows up as cupping, checking, and paint failure at the seams — the exact seams that are already the weak point of this profile.
- Vinyl board and batten is low-maintenance in the sense that it doesn't need painting, but it's a thin, flexible material that was never designed to hold a crisp, deep-shadow batten line the way fiber cement does, and it becomes brittle in cold snaps and can warp near heat sources.
- LP SmartSide is an engineered wood product, and engineered wood is still wood at its core — it's treated to resist moisture better than raw lumber, but it depends on an intact factory coating and careful field sealing at every cut and seam to keep water out. On a house with this many seams, in a climate this wet, that's a maintenance commitment we don't think most homeowners want to sign up for.
We made the call years ago to standardize on James Hardie fiber cement for every board and batten project, including here in Ferndale. It's not that the alternatives are worthless products — it's that none of them hold up to marine air and a long wet season the way a cement-based material does, and board and batten's seam-heavy design leaves no room for a material that struggles with moisture.
Why James Hardie Fits This Profile and This Climate
Fiber cement is dimensionally stable — it doesn't expand and contract with moisture the way wood does, which matters enormously on a profile built from narrow vertical boards and battens. It's also non-combustible, which is a genuine benefit regardless of climate, and it holds a factory-applied ColorPlus finish that's baked on and warranted against fading and peeling, rather than a field-applied paint job that starts degrading the moment it's exposed to salt air and UV.
James Hardie also makes an HZ5 product line engineered specifically for climates like the Pacific Northwest's — colder, wetter conditions where a siding system needs to resist moisture intrusion without becoming brittle. For a Ferndale home facing prevailing weather off the water, that's not a marketing detail, it's the actual product spec doing what it's supposed to do.
| Factor | Board & Batten in Wood/LP | Board & Batten in James Hardie |
|---|---|---|
| Response to sustained moisture | Swells, cups, or requires sealed cuts at every seam | Dimensionally stable, doesn't absorb and swell |
| Finish durability in salt air | Field-applied paint fades and chalks faster | Factory ColorPlus finish, warranted against fading |
| Moss and mildew resistance | Organic surface can support growth if damp persists | Cement-based surface doesn't feed organic growth |
| Fire resistance | Combustible | Non-combustible |
| Typical repaint/recoat cycle | Every 5-8 years depending on exposure | Decades, per ColorPlus warranty terms |
What a Correct Board & Batten Installation Involves
The finished look of board and batten is simple, but what's underneath it is not. A durable installation in a climate like Ferndale's comes down to a handful of details that are easy to skip and expensive to fix later:
- A drainage plane behind the siding. A weather-resistive barrier and, ideally, a rainscreen gap let any moisture that does get past the cladding drain and dry instead of sitting against the sheathing.
- Correct batten spacing and fastening. Battens need consistent spacing over the underlying boards and fasteners driven to Hardie's specified pattern and depth — not just close enough to look right.
- Flashing at every horizontal interruption. Window heads, door heads, and any point where the vertical run is broken need proper flashing so water sheds outward instead of tracking behind the boards.
- Sealed and primed cut ends. Every field cut on fiber cement needs to be sealed per manufacturer spec — an exposed cut edge is the one place fiber cement can take on water if it's left untreated.
- Corrosion-resistant fasteners. Given the salt air, this isn't optional in Ferndale — the wrong fastener becomes a rust streak and a failure point years before the siding itself would need attention.
Our Process for a Ferndale Board & Batten Project
1. On-Site Assessment
We walk the exterior, check the condition of the existing wall assembly, and look specifically at exposure — which elevations take the brunt of the weather off the water, where shade and moss have already established, and where the existing sheathing or trim needs attention before new siding goes on.
2. Detailing the Drainage and Flashing Plan
Before a single board goes up, we plan out the weather-resistive barrier, rainscreen approach, and flashing at every window, door, and horizontal transition. This is the part of the job that doesn't show once it's finished, and it's the part that determines whether the siding is still performing in fifteen years.
3. Installation to Manufacturer Spec
Battens go up with consistent reveals and correct fastener spacing, using corrosion-resistant fasteners suited to a marine-air environment. Every cut edge is sealed. We install to James Hardie's published specifications, which is also what keeps the manufacturer's warranty intact.
4. Final Walkthrough
We walk the finished job with you, check the reveals and lines up close, and go over basic care — mainly how to spot and handle moss before it becomes a maintenance issue, since that's the one thing that requires occasional homeowner attention even with fiber cement.
Maintenance: What Board & Batten in Fiber Cement Actually Needs
One of the honest selling points of James Hardie board and batten is how little it asks of you afterward. It doesn't need repainting on the schedule wood siding does, and it won't cup, split, or absorb moisture the way engineered wood products can. In Ferndale specifically, the one recurring task worth staying on top of is moss control — a periodic soft wash and a visual check of shaded elevations keeps the battens clear before moss has a chance to hold moisture against any surface, siding included.
| Task | Recommended Frequency |
|---|---|
| Visual check for moss/algae on shaded elevations | 1-2 times per year |
| Soft wash (low-pressure) to clear buildup | As needed, typically every 1-2 years |
| Inspect caulking at trim and penetrations | Annually |
| Check fastener heads for corrosion staining | Every few years |
Why a Crew That Already Works Ferndale Matters
Board and batten installed to spec in a dry climate and board and batten installed to spec facing Ferndale's salt air and moss season aren't the same job, even though they look identical when finished. A crew that already works this part of Whatcom County knows which elevations on a given lot are going to take the worst of the weather, has already seen how moss establishes on local homes, and doesn't need to guess at flashing details for a marine environment. That familiarity shows up in the parts of the job you can't see once it's done — and it's exactly those parts that determine how the siding performs ten and twenty years out.
If you're considering board and batten siding for a home in Ferndale, we'd be glad to walk the exterior with you and talk through what the job would actually involve for your specific house. Reach out for a free, no-pressure estimate using the form below.