Lynden Siding Board & Batten in a Climate Like Sumas's
Sumas sits out at the edge of Whatcom County, close enough to the Fraser Valley and the marine weather systems that move through this whole region that homes here take a particular kind of beating year-round. It isn't one dramatic storm that wears down a house — it's the steady combination of salt-tinged marine air drifting in off the Sound, driving rain that comes in sideways for weeks at a stretch in the fall and winter, and a moss season that can run from October clear through April on anything that doesn't get sun or airflow. Board and batten siding looks great on the farmhouse and modern-farmhouse style homes that are common out this way, but that same vertical board-and-strip design has details that either shed this climate well or trap it against your wall, depending entirely on how it's built.
We're a Lynden-based crew, and Sumas is part of our regular service area — not a place we drive out to occasionally. That matters more with board and batten than with almost any other siding style, for reasons we'll get into below.
What Board & Batten Siding Actually Is
The Look
Board and batten is a vertical siding pattern: wide flat boards or panels installed running up and down the wall, with narrow strips (battens) covering the seams between them. It's one of the oldest siding styles in American building — original barns and farmhouses in this valley were sided this way with rough-sawn lumber — and it's had a strong resurgence as a modern exterior look, often mixed with horizontal lap siding on the same house for contrast.
Why It's Common Here
Whatcom County has a lot of rural and semi-rural property, and board and batten reads as an honest, agricultural style that fits the area without looking out of place next to an actual working farm. It also pairs well with the black-and-white or muted earth-tone color schemes that are popular in Sumas and Lynden right now. None of that changes the physics of the wall behind it — a batten is still a strip of material sitting on top of a seam, and how it's fastened, spaced, and flashed decides whether it lasts twenty-plus years or starts failing in five.
Where Board & Batten Goes Wrong in This Climate
The Horizontal Ledge Problem
Every batten and every panel edge creates a small horizontal ledge, even if it's just a few millimeters. In a dry climate that's a non-issue. In a climate with our rain volume and our moss pressure, any horizontal ledge that isn't slightly eased, back-primed, and given somewhere for water to escape becomes a spot where moisture sits, algae gets a foothold, and moss eventually takes root. We see this most on the north and west faces of homes — the shaded, weather-facing sides — where a poorly detailed batten line turns green well before the rest of the house shows any wear.
Fastening Mistakes
Board and batten gets face-nailed more than lap siding does, which means there are more total fasteners penetrating the wall assembly, and more chances for a fastener to be driven wrong. Battens nailed only into the panel below, instead of through to the framing or furring, work loose over a few freeze-thaw and wet-dry cycles. Panels installed without a gap for seasonal movement crack at the fastener points. None of this shows up in year one — it shows up in year five or six, right when a homeowner assumes the siding is done needing attention.
No Drainage Gap
Flat siding installed tight against the wall sheathing, with no rainscreen gap behind it, has no way to dry out after it gets wet — and in this climate, it gets wet often. Water that gets past a seam or a fastener hole sits against the sheathing and the water-resistive barrier instead of draining and evaporating. That's a slow rot problem more than a siding problem, and it's exactly the kind of thing that's cheap to prevent during installation and expensive to fix after the fact.
Why We Only Install This in James Hardie Fiber Cement
We don't offer board and batten in vinyl, wood, or engineered wood siding. That's a deliberate standard, not a lack of options — we've made the call that James Hardie fiber cement is the only material we're willing to put our name behind for this style in a climate like ours, and we think homeowners deserve the honest reasoning, not just the policy.
| Material | How It Handles This Climate | Long-Term Maintenance |
|---|---|---|
| Wood board & batten | Handsome, but absorbs moisture at every seam and batten edge; rot-prone without constant upkeep | Repainting and caulk touch-ups every few years, board replacement over time |
| Vinyl board & batten | Sheds water on the face but relies on loose-fit panels that can warp and gap in temperature swings | Low upkeep but limited repair options once faded or cracked |
| Engineered wood (LP SmartSide style) | Better than raw wood, but still a wood-strand core that's vulnerable if edges or fastener holes aren't sealed | Depends heavily on caulk maintenance at every seam |
| James Hardie fiber cement | Non-combustible, dimensionally stable, engineered HZ formulations for wet marine climates | Factory ColorPlus finish holds color and resists moss growth far longer than field-applied paint |
The System We Use
For board and batten, we build the look using Hardie vertical panel siding with true HardieTrim battens, not a printed pattern on a single sheet. The panels and battens are engineered fiber cement, factory-primed or finished with ColorPlus so the cut edges and face both hold up to UV and moisture the same way. This is a system designed to be installed with a drainage plane behind it, which is the piece that actually solves the trapped-moisture problem described above.
What a Correct Installation Involves
- A rainscreen or furring gap behind the panels so any water that gets past the face can drain and the wall can dry
- Battens fastened through to solid framing or furring strips, not just nailed into the panel beneath them
- Manufacturer-specified gaps at panel joints and around all openings to allow for expansion and contraction
- Correct flashing at every horizontal transition — window heads, roof-to-wall intersections, and the base of the wall
- Kick-out flashing anywhere a roofline meets a sidewall, so runoff is directed away from the siding instead of behind it
- Sealant used only where Hardie's install specs call for it — not as a substitute for proper flashing
- Field-cut edges primed to match the factory finish before they're closed up
None of this is exotic. It's the difference between a crew that treats board and batten as "boards with strips nailed over the seams" and one that treats it as a full water-management assembly with a specific finish on the outside.
Cost Factors on a Sumas Board & Batten Project
| Factor | Why It Moves the Price |
|---|---|
| Tear-off and disposal of existing siding | Old wood or vinyl siding, and any hidden moisture damage behind it, adds labor before new siding goes on |
| Wall height and access | Two-story walls, steep grades, and tight side yards common on rural Sumas lots slow down staging and installation |
| Batten spacing and reveal width | Tighter batten spacing means more material and more fastening labor per square foot |
| Trim complexity | Gable ends, dormers, and mixed board-and-batten-with-lap facades take more cutting and detail work |
| Sheathing or framing repair | Moisture damage found once old siding is off gets addressed before new siding goes up, not covered over |
| Color and finish selection | Standard ColorPlus colors versus custom-order finishes affect lead time and material cost |
How Our Process Works
We start with an on-site look at the home, not a phone estimate — board and batten pricing depends too much on wall condition, access, and existing damage to quote sight unseen. From there:
- Walk the exterior with you, note wall condition, drainage issues, and any moss or moisture staining already present
- Talk through panel size, batten spacing, and color options that fit the home and your budget
- Provide a written estimate that separates tear-off, repair, and installation so you know what you're paying for
- Remove old siding and inspect sheathing before anything new goes up
- Install the rainscreen gap, flashing, panels, and battens to Hardie's published specifications
- Walk the finished job with you and register the manufacturer warranty in your name
Checklist Before You Hire Anyone for Board & Batten Work
- Ask specifically whether they install a drainage gap behind the panels, or install flat against the sheathing
- Ask how battens are fastened — into framing, or just into the panel below
- Ask what happens if they find water damage once old siding is removed
- Ask which fiber cement product line they're quoting and whether it's rated for a marine climate
- Ask for the manufacturer warranty terms in writing, not just a verbal assurance
- Ask how often they work in Sumas or Lynden specifically, versus how far they typically travel for jobs
Why a Crew That Already Works Sumas Matters
Board and batten is less forgiving of a rushed or generic install than lap siding is, because there are more seams, more fasteners, and more horizontal surfaces where water and moss can get a foothold. A crew that works this area regularly has already seen which walls in Sumas take the worst of the driving rain, which north-facing sides need extra attention to moss resistance, and how the local wet season actually plays out on a finished wall over a few years — not just in a manufacturer's install manual. Being based in Lynden also means if something needs a warranty check or a follow-up visit, that's a short trip for us, not a special dispatch.
If you're planning board and batten siding for a home in Sumas, we're happy to come take a look and walk you through what a correctly built version of it looks like for your specific wall. There's a free, no-pressure estimate form below — reach out and we'll get you scheduled.