Ferndale Siding Board & Batten in Sumas: A Style That Earns Its Keep
Board and batten shows up on a lot of homes around Sumas, and it's easy to see why. The vertical lines suit farmhouse and craftsman styles that are common in this part of Whatcom County, it pairs well with barns, shops, and outbuildings that already have a vertical look, and it reads as clean and deliberate rather than busy. 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. The seams between boards are covered, not sealed, and everything about how that joint behaves over time depends on what's underneath it.
This page is specifically about doing board and batten right for homes in and around Sumas — what the local climate asks of it, what a correct installation actually involves, and why we install it in one material only.
What Whatcom County's Climate Does to a Vertical Siding Profile
Homes in this part of Washington deal with a long wet season, driving rain that doesn't always fall straight down, moisture-tinged air moving through the region, and a moss season that can stretch for months. None of that is unique to board and batten, but the profile is more exposed to it in a few specific ways:
- Vertical seams collect and channel water instead of shedding it the way overlapping lap siding does, so any gap in the batten coverage becomes a path for water to travel behind the board.
- Battens create shadow lines and ledges where moss, algae, and organic debris settle, especially on north-facing walls and under eaves that don't get much sun or wind.
- Wood-based boards swell and shrink with the wet-dry cycle common to this climate, and repeated movement works fasteners loose and opens hairline gaps at the batten edges over several seasons.
- Standing moisture behind the cladding doesn't dry out quickly here the way it might in a drier climate, so any material that absorbs water instead of shedding it stays wet longer and starts to fail sooner.
None of this means board and batten is a bad choice for a Sumas home. It means the material and the detailing have to be matched to the climate, not just to the look.
Why Board & Batten Installations Fail When They're Done Wrong
Most of the board and batten problems we get called out to look at trace back to one of a handful of causes, and they're almost always installation or material issues rather than random bad luck:
Battens fastened without a drainage gap
Board and batten needs a rainscreen air gap behind the cladding so any water that gets past the surface has somewhere to go and a way to dry out. When battens and boards are nailed flat against the wall with no gap, moisture gets trapped against the sheathing and stays there.
Wrong fastening pattern for a vertical profile
Vertical boards move differently than horizontal lap siding, and they need a fastening schedule that accounts for that movement without over-restraining the board or leaving it loose enough to work itself free over time.
Butt joints and top terminations left exposed
Where boards meet at a joint, or where the siding meets a roofline, window, or foundation, water finds the path of least resistance. Skipping proper flashing and end-cuts at these transitions is one of the most common shortcuts we see, and it's usually invisible until moisture damage shows up behind the wall.
A base material that wasn't built for this exposure
Raw wood, primed spruce, and some engineered wood products can perform reasonably in a dry climate with regular maintenance. In a climate that stays wet for months at a stretch, those same products need more upkeep than most homeowners are prepared to keep up with indefinitely.
Why We Install James Hardie for Board & Batten — and Nothing Else
We install James Hardie fiber cement exclusively, on every job, for every siding profile — board and batten included. We don't offer LP SmartSide, vinyl, Cemplank, Allura, primed spruce, or cedar as alternatives, and that's a deliberate standard, not an oversight.
For a vertical board and batten application specifically, that means HardiePanel vertical siding paired with HardieTrim boards as the battens, finished in a factory-applied ColorPlus finish. A few reasons this combination is what we put on homes:
- Fiber cement doesn't absorb and swell the way wood-based boards do, so the seasonal movement that loosens fasteners and opens joints on other materials is far less of a factor.
- It's non-combustible, which matters for long-term risk regardless of climate.
- The ColorPlus finish is baked on at the factory under controlled conditions, rather than field-applied paint that has to cure in whatever weather shows up that week — which in Whatcom County can be a real limitation for site-painted materials.
- James Hardie's HZ5 product line is engineered for this climate zone, meaning the moisture and freeze-thaw performance is built into the product spec, not something we're compensating for after the fact.
- The warranty is transferable and substantial when the product is installed to Hardie's specifications, which protects the homeowner's investment even if the home changes hands.
We're not going to tell you other siding products don't have a place. Wood has a real, warm look that some homeowners want regardless of maintenance cost, and vinyl board-and-batten is inexpensive for a reason. But we've made a professional decision to stand behind one material system, install it correctly every time, and not stretch our crews thin trying to be good at everything. For board and batten in this climate, that's James Hardie.
What a Correct Board & Batten Installation Involves
A board and batten job that's going to hold up in Sumas isn't just nailing boards to the wall in a pleasing pattern. Here's what we treat as non-negotiable:
- A weather-resistant barrier installed and lapped correctly over the sheathing before any siding goes up
- A furring or rainscreen gap behind the panels so moisture has a drainage and drying path
- Proper flashing at every window, door, roofline, and foundation transition
- Batten placement and fastening spaced to James Hardie's published specifications for the panel width and exposure
- Sealed and back-primed cut edges where panels are trimmed on site
- Correct nail type, length, and penetration depth into structural framing, not just sheathing
- Careful attention to inside and outside corners, which are common failure points on any vertical profile
Skipping any one of these doesn't necessarily show up on day one. It shows up in year three or four, as moss growth behind battens, soft spots at the base of boards, or paint failure at the joints — the exact problems this climate is good at accelerating.
Our Process for a Sumas Board & Batten Project
1. On-site assessment
We look at the existing wall assembly, exposure on each elevation, and any signs of past moisture issues before we talk about materials or price. A north-facing wall shaded by trees behaves very differently than a wall that gets full sun and wind, and the detailing should reflect that.
2. Tear-off versus overlay decision
Board and batten generally goes on best over a properly prepared wall rather than over existing siding, since the rainscreen gap and flashing details are hard to get right over an old surface. We'll tell you honestly if your project needs a full tear-off.
3. Scheduling around the weather
Given how much of the year is wet here, we plan installation windows around forecasted dry stretches wherever we can, since the wall is most vulnerable to moisture intrusion during the install itself, before the weather barrier and siding are fully closed up.
4. Installation to spec, inspection before close-up
Flashing and the weather-resistant barrier get checked before the siding goes on top of them, not after. Once battens are up, mistakes underneath are hidden — so we don't move forward until that layer is right.
What Drives the Cost of a Board & Batten Project
| Factor | Why It Matters |
|---|---|
| Tear-off vs. new construction | Removing old siding, repairing sheathing, and disposal add labor and material cost beyond the siding itself |
| Wall height and elevation count | Second-story and multi-gable homes require more staging, cutting, and trim work per square foot |
| Batten spacing and pattern | Tighter batten spacing uses more trim material and more labor hours than wider spacing |
| Window, door, and trim complexity | Every opening needs flashing and precise cuts, and homes with more openings take longer per square foot |
| Existing moisture damage | Rotted sheathing or framing found during tear-off has to be repaired before new siding goes on |
We won't quote a number without seeing the home, but these are the factors that move a bid up or down, and we'll walk through each one with you during the estimate.
Maintenance and Longevity to Expect
One of the practical advantages of fiber cement board and batten over wood-based alternatives is how little ongoing upkeep it needs. You should still expect to periodically rinse off moss and organic buildup on shaded or north-facing walls, given how long moss season runs in this part of the county, and to check caulking at trim joints every few years the way you would with any exterior product. What you shouldn't need is repainting, board replacement from swelling, or the kind of recurring repair cycle that wood-based board and batten often demands in a climate this wet.
Why It Matters That We Already Work in Sumas
A crew that installs siding across a range of climates might get the general technique right and still miss the details that matter specifically here — how much of a drainage gap this climate actually needs, which elevations in this area collect moss fastest, or how local permitting and inspection expectations run in Whatcom County. We work in and around Ferndale and Sumas regularly, which means we're not guessing at how this climate treats a vertical siding profile — we're building to what we've already seen it do.
If you're considering board and batten for your Sumas home, we're glad to walk the property with you, talk through what your specific elevations and exposure call for, and give you a straightforward, no-pressure estimate — no invented urgency, just an honest look at what the job needs.