Sumas Window Why Board & Batten Fits Custer, But Only If It's Built Right
Board and batten has become one of the most requested looks in Whatcom County over the last several years — the vertical lines read as modern farmhouse on a new build and as a clean, deliberate update on an older home. In Custer specifically, that popularity runs into a practical problem: this is a stretch of the county that sits close enough to the water to catch salt-laden air, open enough to take driving rain straight off passing storms, and shaded and damp enough in the wetter months to grow moss on anything that holds moisture. A board and batten profile that looks great on a dry-climate listing photo can perform badly here if it's built with the wrong material or the wrong details behind it.
That's the real subject of this page. Not "should you like board and batten" — most people do — but what it takes for a board and batten system to actually hold up on a Custer home for decades instead of years.
What This Climate Does to Vertical Siding Over Time
Moss and Algae on the Shaded Faces
Board and batten creates dozens of vertical seams and a heavily shadowed batten line across the whole wall. On the north and east faces of a home, especially anywhere shaded by trees or a neighboring structure, those seams stay damp longer after every rain event of our long wet season. Moss and algae take hold in exactly that kind of persistent moisture, and once established they hold even more water against the siding surface — a cycle that accelerates whatever's underneath if the material or the finish isn't built to resist it.
Driving Rain, Not Just Rainfall
Whatcom County doesn't just get a lot of rain — a good share of it arrives sideways, pushed by wind off open ground and water. Vertical siding is more exposed to wind-driven rain than horizontal lap siding because there's no overlapping shingle effect shedding water downward and outward. Every batten and every panel seam is a place water can be forced against the wall, which is why the assembly behind the visible boards matters as much as the boards themselves.
Salt Air's Slow, Quiet Damage
Custer sits close enough to coastal air that salt exposure is a real factor, not a theoretical one. Salt accelerates corrosion on fasteners, flashing, and any metal trim, and it degrades paint and finishes faster than an inland climate would. On board and batten in particular, where fastener count is high and trim details are everywhere, using the wrong fastener metal or an unprotected finish is a slow, expensive mistake — one that usually doesn't show up until it's already underway.
What a Correct Board & Batten Installation Actually Includes
A lot of what determines whether board and batten lasts in this climate is invisible once the job is done. If you only judge a bid on the visible boards, you're missing most of what you're paying for.
A Working Rainscreen and Drainage Plane
Behind every board and batten wall we install, there's a drainage gap and a weather-resistive barrier designed to let any moisture that gets past the siding drain back out instead of sitting against the sheathing. On a vertical system with this many seams, skipping the rainscreen is one of the most common shortcuts — and one of the most damaging, because it turns a normal amount of incidental moisture into a trapped-moisture problem.
Fastening and Batten Spacing Done to Spec
Fiber cement board and batten has specific fastener type, spacing, and penetration requirements, and batten placement has to land on framing or blocking, not just wherever it looks even. Getting this wrong doesn't usually fail immediately — it fails five or ten years in, as fasteners work loose or corrode and boards start to move.
Flashing at Every Transition
Windows, doors, corners, roof lines, and the bottom termination at the foundation are where board and batten installations actually fail. Each of those needs proper flashing and clearance, not just caulk, because caulk is a maintenance item and flashing is a permanent detail. In a climate that delivers driving rain as routinely as this one does, that distinction matters more than it would somewhere drier.
Quick Reference: What Should Be True on Any Bid You're Comparing
- Drainage gap or rainscreen specified behind the siding, not siding installed directly over the barrier
- Batten and fastener spacing called out to manufacturer specification, not "standard spacing"
- Corrosion-resistant fasteners specified by name, given the salt air exposure in this part of the county
- Flashing detailed at windows, doors, corners, and the base of the wall — not left to caulk
- Factory-applied finish on the siding itself, not a field-applied paint or primer that will need repainting
Why We Install James Hardie Board & Batten — and Not the Alternatives
We install one siding system: James Hardie fiber cement. On board and batten specifically, that means Hardie panel and batten profiles with a factory ColorPlus finish, engineered for this region's weather rather than a general national spec. We don't install wood, vinyl, or LP-style engineered wood board and batten, and it's worth explaining why rather than just stating it.
Wood board and batten can look excellent on day one, but it's an organic material in a climate that stays wet for months at a time — it needs regular repainting or restaining, it's the material most prone to hosting moss growth, and any gap in the finish becomes an entry point for rot. Vinyl board and batten sheds water fine but expands and contracts more than fiber cement, which shows at long vertical seams, and it's a petroleum product with a finish that fades under UV rather than a factory finish engineered to hold color. Engineered wood products in this category use wood fiber with a resin binder, which performs reasonably in a lot of climates but is more sensitive to sustained moisture exposure at cut edges and seams than fiber cement — a real consideration on a vertical profile with this many seams, in a county that gets this much rain. None of these are "bad" products in every application. They're just not what we've chosen to put our name behind in this specific climate.
| Factor | James Hardie Fiber Cement | Wood Board & Batten | Vinyl Board & Batten |
|---|---|---|---|
| Moss/algae resistance | Strong with factory finish | Weak — organic surface, common moss host | Moderate — moss grows on grime buildup |
| Driving rain performance | Strong when installed with proper flashing/rainscreen | Moderate — vulnerable at unsealed seams | Moderate — seams can flex under wind-driven rain |
| Salt air durability | Strong — non-combustible, engineered finish | Weak — accelerated finish and fastener wear | Moderate — finish chalks and fades faster |
| Maintenance over 15 years | Occasional wash; no repainting typically needed | Repeated repainting/restaining required | Periodic washing; can crack in cold, warp in heat |
| Typical lifespan | Multiple decades with correct install | 10-20 years before major refinishing needs | 20-30 years, finish degrades sooner |
What the Product Line Actually Offers
James Hardie's board and batten options come in panel form with integrated or applied battens, available in factory ColorPlus finishes that carry their own finish warranty separate from the substrate warranty on the product itself. The HZ product lines are engineered in different formulations for different climate zones, which matters here — a product engineered for a hot, dry region isn't built around the same moisture exposure Whatcom County sees. We spec the version built for this region's weather, not a generic national default.
Our Process for a Custer Board & Batten Project
- On-site assessment — we look at existing siding, sheathing condition, sun/shade exposure on each wall, and any signs of past moisture intrusion before we ever talk product.
- Moisture and substrate check — especially important on a re-side, since board and batten will show any underlying sheathing problems faster than it hides them.
- Drainage plane and rainscreen installation — the invisible layer that determines how the whole system performs over the next twenty-plus years.
- Batten and panel installation to spec — correct spacing, correct fastening, correct flashing at every window, door, and corner.
- Final detailing and walkthrough — trim, caulking at appropriate joints only (not as a substitute for flashing), and a final check against the original assessment.
Living With Board & Batten in a Moss-Prone, Salty Climate
Correctly installed Hardie board and batten is low-maintenance, not zero-maintenance. A few habits keep it performing the way it's designed to in this environment:
- Rinse shaded, moss-prone walls once or twice a year rather than waiting for visible growth to build up
- Keep gutters clear so overflow doesn't run down and concentrate moisture on specific wall sections
- Trim back vegetation that shades walls and slows drying after rain
- Have caulking at trim and penetrations checked periodically — it's a maintenance item, not a permanent seal
- Address any impact damage or corner damage promptly rather than letting an opening sit exposed through a wet season
Why a Crew That Already Works in Custer Makes a Difference
Whatcom County's building requirements, typical framing conditions, and the specific weather exposure of this stretch of the county aren't things you learn from a manufacturer spec sheet — they're things you learn by installing here repeatedly. A crew that already works in and around Custer knows which walls on a typical local home take the worst of the wind-driven rain, has already worked with the area's permitting expectations, and isn't guessing at how much drainage capacity a given wall assembly actually needs in this climate. That local pattern-recognition is part of what you're paying for on a board and batten project, not just the labor to hang the boards.
What Affects the Cost of a Board & Batten Project
Board and batten typically costs somewhat more than lap siding to install on the same wall area, largely because of the additional batten material and the higher fastener and labor count per square foot. Beyond that baseline, the biggest cost swings on a real project come from how much of the existing wall needs repair before new siding goes on, how much trim and corner detail the home has, and whether it's a full re-side or new construction. We don't quote board and batten off a flat per-square-foot number sight unseen — the assessment step exists specifically so the number we give reflects your home's actual condition, not a generic average.
If you're weighing board and batten for a home in Custer, we're glad to walk the property, look at what's there now, and put together a straightforward, no-pressure estimate — no obligation, just an honest look at what your home actually needs.