Custer Board & Batten Siding in Sumas: A Style That Has to Earn Its Keep
Board and batten has a specific look — tall, vertical lines, strong shadow lines from the battens, a clean farmhouse or modern-craftsman feel that shows up on a lot of newer builds and remodels around Sumas and the rest of Whatcom County. It's a popular choice for good reason: it reads as more custom than plain horizontal lap, it pairs well with stone or dark trim accents, and the vertical lines can make a simple rectangular home look taller and more intentional.
But board and batten is also one of the less forgiving siding styles to get wrong. The battens create dozens of extra seams and fastening points compared to a horizontal lap job, and every one of those seams is a place water can find its way behind the cladding if the install isn't done correctly. In a climate like this one — with sustained rain, moss growth, and salt-tinged air moving in off the water — a board and batten job that's installed "close enough" tends to show its problems years before a well-built horizontal lap wall would.
What Whatcom County Weather Actually Does to This Siding Style
Sumas sits in a part of Washington that gets more than its share of driving rain, and homes here also deal with the long, low-sun stretch of fall and winter when north- and west-facing walls barely dry out between storms. Add in salt air drifting inland off the water and you get a combination that's hard on fasteners, caulk joints, and any wood-based siding product.
- Driving rain finds vertical seams. Board and batten has a batten strip covering every panel joint — if those joints aren't flashed and gapped correctly, wind-driven rain gets pushed up and under the battens instead of running off.
- Moss and algae need shade and moisture to establish — exactly what a north-facing wall under mature trees provides for most of the year in this area. Siding that can't resist that growth stays damp longer, which accelerates everything else.
- Salt-influenced air corrodes exposed metal faster than it would inland — fasteners, flashing, and trim caps all need to be rated for it, not just whatever was cheapest at the supply house.
- Freeze-thaw cycles, while milder here than east of the mountains, still stress any caulk joint or seam that's holding water instead of shedding it.
None of this means board and batten is a bad choice for a Sumas home. It means the product and the installation both have to be built for this specific climate, not just installed the way a crew would in a drier region.
Why We Only Install James Hardie for This Style
Board and batten can be built from several materials, but the material matters more here than in almost any other siding style, because of how much end-grain and seam exposure the design creates. We install James Hardie fiber cement exclusively — for board and batten and every other style — and that choice is especially deliberate for this look.
James Hardie's vertical panel and batten systems are fiber cement: sand, cement, and cellulose fibers, engineered and cured to be non-combustible and dimensionally stable. Unlike wood-based battens or trim, Hardie board and batten doesn't swell, cup, or rot when it stays damp for a few extra days after a storm — which, in this climate, is a regular occurrence, not an edge case. It's also manufactured in HZ5 formulations engineered specifically for the wetter, harsher climate zones of the Pacific Northwest, which matters more for a style with this many exposed seams than it would for a simple lap wall.
The factory-applied ColorPlus finish is the other piece that matters for board and batten specifically. Because the finish is baked on at the factory rather than field-applied, cut edges and seams — of which there are many on a batten wall — get treated with matching touch-up product instead of relying on job-site paint to hold up. That finish also resists the moss and algae growth this area is known for far better than bare or site-primed wood battens do.
What Correct Board & Batten Installation Actually Involves
The visual result of a board and batten job — evenly spaced battens, straight lines, tight corners — is the easy part to judge from the street. What actually determines whether the wall performs for the next 30 years happens underneath, where nobody but the installer ever sees it.
The details that separate a correct install from a problem job
| Detail | Why it matters in Sumas's climate |
|---|---|
| Rainscreen gap / furring behind panels | Lets any moisture that does get behind the cladding drain and dry instead of sitting against the wall sheathing |
| Weather-resistive barrier, properly lapped | Backstops the cladding during the driving-rain events this area gets several times a winter |
| Batten fastening pattern | Battens need to land on framing, with fasteners spaced and set to Hardie's published specs — not just "wherever looks even" |
| Panel and batten gaps | Correct expansion gaps at seams and trim prevent the buckling and cracked caulk lines that let water in |
| Flashing at window and door heads | Every horizontal interruption in a vertical wall is a place water wants to enter if flashing is skipped or shortcut |
| Fastener and trim material | Corrosion-resistant fasteners and flashing hold up to the area's salt-influenced air over decades, not just years |
Any one of these done wrong won't necessarily show up in the first year. That's exactly why board and batten has a reputation for looking great at closing and causing trouble five to ten years later — the failures are usually installation failures, not product failures, and they take time to surface.
Board & Batten vs. Other Siding Choices for Sumas Homes
Homeowners planning a board and batten project often compare it against other materials or against a horizontal lap profile in the same James Hardie product line. Here's an honest look at the trade-offs.
| Option | Trade-off in this climate |
|---|---|
| James Hardie board & batten (what we install) | More install labor than lap siding due to seam count, but non-combustible, dimensionally stable, and factory-finished for long-term moss and moisture resistance |
| Vinyl board & batten | Lower upfront cost, but the vertical panels can show waviness in temperature swings, and seams rely on caulk and overlap rather than a rigid, engineered system |
| Wood or primed spruce battens | Authentic look, but end-grain and battens absorb moisture readily in a climate this wet, driving repaint and rot-repair cycles |
| LP SmartSide vertical panel/batten | Engineered wood product — holds paint well when new, but as a wood-based substrate it depends heavily on caulking and edge sealing staying intact in constant damp conditions |
We don't install the vinyl, wood, or engineered-wood options above — not because they're incapable of being installed well, but because we've standardized on one product system we can stand behind for the life of the warranty, and fiber cement is the one that holds up best to this specific mix of rain, moss, and salt air with the least long-term maintenance burden.
Our Process for a Sumas Board & Batten Project
1. On-site assessment
We look at wall orientation, existing moisture damage, roof and gutter drainage near the walls, and how much shade and tree cover each elevation gets — all of which affect how the finished wall will perform, not just how it will look.
2. Substrate and moisture barrier prep
Damaged sheathing gets addressed before anything goes back up. This is also where the rainscreen or furring strategy gets planned around the specific wall assembly.
3. Panel and batten installation to spec
We follow James Hardie's published fastening, gapping, and flashing requirements for the specific board and batten system being installed — not a generalized "siding install," because board and batten has its own set of installation instructions for a reason.
4. Trim, flashing, and detail work
Window and door heads, corners, and any wall penetrations get flashed and sealed as part of the install, not treated as an afterthought once the field panels are up.
5. Final walk-through
We go over the finished wall with the homeowner, including basic care expectations and what the warranty covers.
What Drives Cost on a Board & Batten Project
| Factor | Why it moves the price |
|---|---|
| Wall height and complexity | Board and batten on a two-story wall or one with multiple gables takes more labor and material than a simple single-story rectangle |
| Existing wall condition | Rot, mold, or failed sheathing found during tear-off adds repair scope before new siding goes up |
| Batten spacing and trim detail | Tighter batten spacing and heavier trim profiles add material and labor over a minimal detail package |
| Color and finish | Factory ColorPlus finishes vary slightly in cost by color and sheen compared to standard primed panel |
We give a firm, written number after seeing the actual walls in person — broad ranges over the phone rarely survive contact with a real house, and we'd rather quote it once, correctly.
Why Hiring a Crew That Already Works Sumas Matters
Board and batten installation quality depends on judgment calls — where to add extra flashing, how to detail a tricky window head, how to handle a wall that gets more weather exposure than its neighbors. A crew that already works homes in and around Sumas has made those calls on this area's houses, in this area's weather, more than once. That's different from a crew reading a generic install manual for the first time on your wall. Familiarity with how local homes are built, what the winters here actually do to a wall over several seasons, and which details matter most on this specific siding style is the difference between a job that looks good at handoff and one that still looks good in year fifteen.
A Quick Checklist Before You Sign a Board & Batten Contract
- Confirm the contractor is proposing a real rainscreen or furring strategy, not just panel-direct-to-sheathing
- Ask for the specific fastening and gapping spec they'll follow, and confirm it matches Hardie's published instructions
- Check that window, door, and penetration flashing is called out explicitly in the estimate — not lumped into "installation"
- Ask what fastener and trim materials they use, given the salt-influenced air in this region
- Get the warranty terms in writing — both the manufacturer's product warranty and the installer's workmanship warranty
- Ask how they handle any rot or sheathing damage found once the old siding comes off
If you're weighing board and batten for a home in Sumas, we're happy to take a look and put together a straightforward, no-pressure estimate — just fill out the form below.