Lynden Siding Why Board & Batten Works So Well Around Sumas
Board and batten has a long history on farmhouses and rural properties throughout Whatcom County, and Sumas is no exception. The vertical lines suit the working landscape here — barns, outbuildings, and older farmhouses on the Sumas Prairie have worn this look for generations. But beyond style, board and batten is a genuinely practical siding profile for this part of the county. The vertical boards shed water down the wall face rather than catching it on horizontal ledges, and the raised battens create shadow lines that help hide the minor waviness common in older wall framing. Done correctly, it's one of the better-performing profiles for a climate that stays wet more months than it stays dry.
The catch is that "done correctly" is doing a lot of work in that sentence. Board and batten depends more on installation detail than lap siding does — the battens create extra seams, extra fastener penetrations, and extra opportunities for water to get trapped if the assembly isn't built right. In a town like Sumas, close to the border and sitting low on agricultural land near the Nooksack watershed, that margin for error is smaller than it looks.
What Whatcom County Weather Does to Vertical Siding
Driving rain and a long wet season
Sumas sees the same wind-driven Pacific storms that move through the rest of Whatcom County, and low-lying farmland offers little in the way of wind breaks compared to more sheltered residential neighborhoods. Driving rain doesn't just fall on a wall — it gets pushed sideways into every seam, joint, and fastener line. On board and batten, that means the vertical joints between boards and the horizontal seams at floor lines take the brunt of it, year after year.
Moss and constant moisture
Whatcom County's long moss season is a fact of life, and north-facing or shaded walls near mature trees or outbuildings are especially prone to it. Moss and algae hold moisture against the siding surface far longer than open air would, which accelerates paint failure on wood siding and stresses caulked joints. A siding material that doesn't feed moss growth, and a finish that doesn't peel when moss is scrubbed off, matters more here than in drier parts of the state.
Seasonal flooding on low ground
The farmland surrounding Sumas is low-lying and has seen serious seasonal flooding in past years. While siding sits well above grade on most homes, flood-prone properties need extra attention at the base of the wall — proper clearance, water-resistant materials near ground level, and flashing details that don't trap moisture if water does reach the lower courses.
Board & Batten, Built for This: The James Hardie System
We install James Hardie fiber cement exclusively, and for board and batten that means Hardie's engineered vertical panel and batten system rather than solid wood boards or vinyl panels. Fiber cement doesn't absorb water the way real wood does, so it doesn't swell, cup, or rot at the joints the way a wood board and batten wall eventually will in a climate this wet. It also carries a Class 1(A) non-combustible fire rating, which matters given how much agricultural burning and dry-season brush risk exists around rural Whatcom County properties.
James Hardie manufactures its products in different formulations for different climates — what the company calls HZ engineering. Products specified for our region are engineered for cold, wet, freeze-thaw conditions rather than hot, dry ones. That distinction is easy to overlook but it's the difference between a product that was designed for this weather and one that merely tolerates it.
ColorPlus factory finish
Board and batten has more seams and edges than most profiles, which means more places for a field-applied paint job to fail first. Hardie's ColorPlus finish is baked on at the factory under controlled conditions, with touch-up product formulated to match. That finish holds color and resists moss-related staining far longer than site-painted wood, and it's backed by its own finish warranty separate from the substrate warranty.
What a Correct Board & Batten Installation Actually Involves
Most siding failures we get called out to inspect aren't material failures — they're installation failures. Board and batten is unforgiving of shortcuts because the batten strips hide a lot of what's underneath, which makes it tempting to rush. A correct installation includes:
- A code-compliant weather-resistive barrier installed over sound sheathing, with all penetrations and laps properly sealed before any siding goes up
- A rainscreen air gap behind the panels so any moisture that does get past the surface can drain and dry rather than sitting against the wall
- Correct fastener type, length, and spacing per the manufacturer's published fastening schedule — not shortened to save time
- Battens spaced and fastened into structural framing, not just into the panel or sheathing
- Proper flashing at every horizontal joint, window, door, and roof-to-wall intersection
- Minimum required clearance from the siding's bottom edge to grade, decks, and roof lines
- Manufacturer-approved sealant at joints that require it, compatible with the ColorPlus finish
Skip any one of these and the wall may look fine for a year or two before problems show up — usually as a stained or soft spot at a batten seam, right when it's expensive to fix.
Comparing Vertical Siding Options for a Sumas Property
| Material | Moisture Performance in This Climate | Maintenance | Typical Lifespan |
|---|---|---|---|
| James Hardie fiber cement board & batten | Engineered for cold/wet climates; does not swell or rot | Occasional wash; factory finish resists moss staining | Multiple decades with proper install |
| Solid wood (cedar or primed spruce) board & batten | Absorbs moisture at joints; prone to swelling and rot over time | Repainting/staining on a recurring cycle, more often on north-facing walls | Shorter, heavily dependent on maintenance follow-through |
| Vinyl vertical panel | Sheds water well but seams and panels can warp with temperature swings | Low, but fading and brittleness increase with age and sun exposure | Moderate, with visible aging |
| Engineered wood composite | Better than solid wood but still moisture-sensitive at cut edges and joints | Moderate; edge sealing is critical and easy to miss | Moderate, warranty often conditioned on strict install and maintenance requirements |
This is a general comparison of material characteristics, not a claim about any specific brand's failure rate. The point is simple: in a climate that stays damp for much of the year, the material's actual moisture behavior — not just its appearance on install day — is what determines how the wall holds up ten and twenty years out.
How Our Process Works on Sumas Properties
We start with an on-site look at the specific walls getting board and batten — orientation, moss history, existing moisture damage, and how close the siding sits to grade or to flood-prone ground. That informs the flashing and clearance details before a single panel is ordered. From there, we handle tear-off of the old siding, sheathing repair where needed, correct barrier and rainscreen installation, and layout of the board and batten pattern to keep spacing even across the wall — something that's harder to get right on older farmhouse construction where corners and openings aren't always perfectly square.
Color selection happens against Hardie's ColorPlus palette, and we account for how a color will actually read on a rural property with open sky exposure versus a shaded lot near mature trees, since both affect how fast moss and grime become visible.
Maintenance and Longevity Once It's Installed
Board and batten with a factory finish is genuinely low-maintenance, but "low" isn't "none." An annual rinse to knock down moss and pollen buildup, prompt attention to any gutter or downspout issue that's dumping extra water onto a wall section, and periodic visual checks at flashing points are enough to keep a correctly installed system performing for decades. What you're not signing up for is the repaint and recaulk cycle that wood board and batten demands in this climate.
Why Hire a Crew That Already Works in Sumas
A crew that only occasionally works this far north in Whatcom County doesn't have the same working knowledge of what this specific ground and weather pattern do to a wall over time — the flood-prone low areas, the moss pressure on shaded farmhouse walls, the wind exposure on open agricultural lots. Local crews also understand the permitting and inspection process for the smaller jurisdictions out here, which keeps a project moving instead of stalling on paperwork. We work Sumas alongside Lynden and the rest of the county regularly, which means we're not learning the local conditions on your project — we already know them.
If you're weighing board and batten for a Sumas property, we're happy to walk the exterior with you, look at your specific exposure and moisture history, and lay out honest options — no pressure, no hard sell. Reach out below for a free estimate.