Ferndale Board & Batten Siding, Built for What Sumas Actually Deals With
Board and batten has become one of the most requested siding looks in Whatcom County, and it's easy to see why — the strong vertical lines read as modern on a new build and as classic farmhouse on an older one. But in Sumas, the look is only half the job. This is a community that sits near the Canadian border in a corridor known for strong outflow winds funneling down from the Fraser Valley, combined with the long, damp Pacific Northwest winters that define this whole region. A siding style that photographs well but doesn't hold up to that combination isn't doing its job.
When we install board and batten in Sumas, we're thinking about wind-driven rain finding its way behind the battens, moss colonizing horizontal ledges and batten tops, and a install that will still be sealed tight in fifteen years, not just on the day it goes up. That's the standard we hold every job to.
What Sumas's Climate Does to Exterior Siding Over Time
Whatcom County's marine-influenced climate brings salt-tinged air near the water, driving rain through the fall and winter, and a moss season that can stretch nearly half the year on shaded or north-facing walls. Sumas adds its own wrinkle: the area sits in a recognized wind corridor where cold outflow air moves down from the Fraser Valley, arriving with more force and more sustained pressure than most of the rest of the county sees. That wind doesn't just rattle loose trim — it drives rain sideways and finds every gap in a siding system that wasn't detailed correctly.
Why Vertical Siding Is Especially Sensitive to This
Board and batten is a vertical siding system, which means every horizontal seam — at window heads, at the transition between floors, at the bottom termination near grade — is a place where wind-driven water can be pushed upward and backward instead of simply running down and off. On a lap-sided house, gravity and overlap do most of the water-shedding work. On a board and batten house, correct flashing and joint detailing have to do that work instead, because the panel-and-batten design doesn't rely on overlap the same way.
Add in moss. Moss holds moisture against a surface far longer than open air ever would, and it doesn't need much of a ledge to get started — a batten top, a slightly proud fastener, a window sill returns. On wood-based or engineered-wood siding, that sustained moisture is exactly the condition that leads to swelling, delamination, and rot at the edges. On correctly installed fiber cement, it's a cosmetic issue that gentle cleaning resolves. That difference is the whole reason product choice matters as much as workmanship on this style.
Board & Batten 101: How It's Actually Built
Board and batten siding is a two-layer vertical system: wide flat panels (or overlapping vertical boards) form the base plane, and narrower strips — the "battens" — are fastened over every seam between panels. Done right, the battens aren't just decorative; they're the primary weather seal covering the vertical joints, backed by a water-resistive barrier and proper flashing underneath.
Where Installations Go Wrong
Almost every board and batten failure we've seen in older Whatcom County homes traces back to the same handful of mistakes:
- Battens face-nailed without any gap for the panel to expand and contract behind them, which eventually cracks the caulk line and opens a path for water
- No consistent rain screen gap behind the panels, trapping moisture against the sheathing instead of letting it drain and dry
- Missing or undersized flashing at window and door heads, the single most common point of water intrusion on any vertical siding system
- Battens run too close to grade or a roofline, with no clearance for water to shed away from the wall
- Caulk used as the primary weather seal instead of proper flashing, which fails within a few years in this climate regardless of caulk quality
Every one of these is a labor and detailing problem, not a product problem — which is exactly why we're as particular about the crew doing the work as we are about the material going on the wall.
Why We Install This Style in James Hardie Fiber Cement Only
Board and batten shows up in several materials — engineered wood, vinyl, primed spruce or cedar boards, and fiber cement. We install James Hardie fiber cement exclusively, and on a vertical system in a wind-and-rain corridor like Sumas, the reasons matter more than usual.
Engineered Wood and Solid Wood
Wood-based board and batten — whether it's an engineered wood product or traditional cedar or primed spruce boards — depends entirely on an intact factory or field-applied coating to keep moisture out. Board and batten multiplies the number of cut ends and exposed edges compared to lap siding, because every batten has two long edges and both ends exposed to weather. Every one of those cut edges is a place where moisture can get into the substrate if the seal isn't perfect and stays perfect for years. In a climate with this much sustained dampness and moss pressure, that's a maintenance burden we don't think is fair to ask a homeowner to sign up for.
Vinyl Board and Batten
Vinyl board and batten panels are lightweight and low-cost, but they're also thin and flexible by nature, which shows on a vertical run where any waviness or thermal movement is highly visible in raking light. Vinyl also becomes brittle in sustained cold, which matters in a spot like Sumas where outflow wind events bring real cold snaps, and it's a combustible material — a consideration a growing number of homeowners are weighing seriously given wildfire smoke seasons and insurance conversations happening across the Pacific Northwest.
James Hardie Fiber Cement
James Hardie's board and batten systems (HardiePanel vertical siding paired with HardieTrim battens) are non-combustible, dimensionally stable across temperature and moisture swings, and finished with the ColorPlus factory finish system, which is baked on and warrantied against fading and chipping rather than depending on a field-applied coat. The product is also engineered in HZ5 and HZ10 formulations specifically for the wetter, cooler climate zones the Pacific Northwest falls into — meaning the material itself is built for exactly the conditions Sumas sees every winter, not adapted from a product designed for a drier region.
What a Correct Installation Looks Like, Step by Step
| Stage | What We Do | Why It Matters in Sumas |
|---|---|---|
| Substrate check | Inspect sheathing for existing rot or soft spots before covering anything | Old moisture damage under failed siding is common on homes exposed to years of wind-driven rain |
| Water-resistive barrier | Install a continuous weather barrier with properly lapped and taped seams | This is the real waterproofing layer — siding is the first line of defense, not the last |
| Rain screen gap | Furring or a drainage mat behind the panels | Lets any moisture that gets past the siding drain and dry instead of sitting against the wall |
| Flashing | Metal or membrane flashing at every window, door, and horizontal transition | Wind-driven rain gets pushed into these joints; flashing (not caulk) is what actually stops it |
| Panel and batten fastening | Fastened per Hardie's published spec, with room for material movement | Prevents the cracked seams and popped fasteners we see on older DIY or under-spec jobs |
| Grade and roofline clearance | Maintain proper clearance at the bottom edge and at roof intersections | Keeps siding out of standing water and splash-back, a common moss and rot starting point |
Our Process for Sumas Homeowners
- On-site walkthrough — we look at your home's actual wind exposure, existing siding condition, and any trouble spots before quoting anything
- Honest scope — if there's hidden sheathing damage, we tell you before we start, not after we've already opened the wall
- Written estimate — clear about product, labor, and what's included, with no surprise add-ons mid-job
- Correct build-up — barrier, rain screen, flashing, then panels and battens, in that order, every time
- Final walkthrough — we go over the finished work with you before calling the job done
What Board & Batten Costs and What Drives the Price
Board and batten typically costs somewhat more than standard lap siding to install, largely because of the extra labor involved in fitting and fastening the battens over every seam. The broad factors that move the number for a Sumas project:
| Factor | Effect on Cost |
|---|---|
| Home size and number of stories | More wall area and taller walls both add material and labor time |
| Existing siding removal | Tear-off and disposal of failing siding adds to the scope |
| Sheathing repair | Any rot found once old siding comes off is addressed before new siding goes on |
| Trim and window count | More openings mean more flashing detail work, which is where the labor really goes |
| Color and finish | Factory ColorPlus finishes vary slightly by color line |
We don't quote off square footage alone — a walkthrough is the only way to give you a number you can actually rely on.
Keeping Board & Batten Siding Looking Right in This Climate
Fiber cement board and batten needs far less upkeep than wood-based alternatives, but "low maintenance" isn't "no maintenance" in a climate like this one. A simple annual routine goes a long way:
- Rinse the siding down once a year, paying attention to north-facing walls and anywhere tree cover keeps a wall shaded and damp longer
- Check caulk joints at window and door trim for cracking or gaps, especially after a hard winter wind season
- Look at the bottom edge of the siding near grade for splash-back staining or moss buildup and clear vegetation or mulch that's piled up against it
- Keep gutters clear so overflow isn't running down the wall face during heavy rain events
- Address any moss with a gentle wash rather than pressure-washing directly into seams, which can force water behind the siding
Why Hiring a Crew That Already Works in Sumas Matters
Board and batten rewards precision, and precision comes from having actually installed it in the conditions it has to survive. A crew that's worked this part of Whatcom County knows where the wind hits hardest, which wall orientations hold moss the longest, and how much clearance a bottom edge actually needs once winter rain and outflow wind show up together. That's not something a general spec sheet teaches — it's something you learn by doing the work here, on homes like yours, in this weather.
If you're weighing board and batten for a home in Sumas, we're happy to walk the property, look at what your walls actually face, and give you a straight, no-pressure estimate for doing it right the first time. There's a form right below this to get that conversation started.