Bellingham Roofing Board & Batten Siding in Sehome
Sehome is one of Bellingham's older, established neighborhoods — hillside streets, mature tree canopy, and a mix of craftsman, bungalow, and mid-century homes near Western Washington University and Sehome Hill. Board and batten siding fits that housing stock well. The vertical lines read as farmhouse-modern on newer remodels and as a period-correct accent on older homes, especially on gables, dormers, and entry features where a horizontal lap pattern can look flat.
But board and batten is not a purely cosmetic choice. The wide boards and narrow battens create a distinct seam pattern, and how that pattern is built — what's behind it, what it's fastened with, and how water is shed off of it — determines whether it looks good for five years or twenty. In a Whatcom County climate, that build quality matters more than the style does.
Why Bellingham's Climate Is Hard on Vertical Siding
Sehome sits close enough to Bellingham Bay that salt-laden air is a real factor on fasteners, trim, and any exposed metal. Add the region's long stretch of driving rain — sideways rain that hits vertical siding boards differently than it hits horizontal lap — and you have two separate problems working on the same wall at once.
The tree cover that makes Sehome's older streets pleasant also means shaded, slow-drying siding for a large part of the year. Combine that with our long moss season and you get siding that stays damp longer than it would on an open, sunny lot. Board and batten has vertical seams and butt joints that can trap moisture if they aren't detailed correctly, and vertical boards show streaking, moss growth, and panel cupping faster than horizontal siding when the assembly behind them can't dry out.
What this means in practice
On a Sehome job, we're not just choosing a siding profile — we're choosing a drainage strategy. The boards and battens are the visible layer; the water management behind them is what actually protects the house.
What James Hardie Board & Batten Actually Is
We install James Hardie fiber cement exclusively, and for vertical siding that typically means HardiePanel vertical siding paired with HardieTrim battens, or a full board-and-batten assembly built from HardiePanel and matching trim boards. It's cement, sand, and cellulose fiber pressed and cured into a rigid, non-combustible board — not a wood product, and not vinyl.
That matters here specifically because fiber cement doesn't absorb moisture the way wood-based sidings do, and it doesn't soften, warp, or rot the way engineered wood products can when a seam takes on water over several wet seasons. It also doesn't expand and contract with humidity the way vinyl does, which keeps long, straight vertical joints looking straight instead of waving.
Hardie's ColorPlus finish is baked on at the factory under controlled conditions, rather than field-painted on site. On a shaded, damp lot like a lot of Sehome's older parcels, that matters — factory-cured finish holds color and resists the chalking and fading that field-applied paint can show first in low-light, high-moisture spots.
What a Correct Board & Batten Installation Involves
Drainage plane and rainscreen gap
Every board and batten job we do starts with a weather-resistive barrier installed correctly — lapped shingle-style, taped at seams, and flashed at every penetration before a single board goes up. On most Sehome homes we also build in a rainscreen gap behind the siding using vertical furring strips. That gap lets any moisture that does get behind the boards drain and dry out instead of sitting against the sheathing.
Fastening and board layout
Vertical HardiePanel boards need to land on solid backing — either directly over sheathing with proper blocking or over the furring strips mentioned above — with fastener spacing and edge distance set to Hardie's published specs. Battens are then face-nailed or blind-nailed over the panel joints, covering the seam completely and giving the wall its board-and-batten look while adding a second layer of protection over every joint.
Trim, corners, and flashing
Corners, window and door casings, and the transition where board and batten meets a different siding profile (common on additions and updated gables) are where most siding failures start. We use Hardie trim boards throughout, back it with proper flashing, and keep a consistent gap at grade and under windows so bottom edges never sit in standing water or wick moisture from soil contact.
Board & Batten vs Other Siding Choices for a Sehome Home
| Factor | James Hardie Board & Batten | Engineered Wood (LP-type) | Vinyl Board & Batten |
|---|---|---|---|
| Moisture behavior | Does not absorb or swell; cement-based | Can swell/soften at cut edges and seams if moisture gets in | Doesn't absorb, but seams flex and can gap over time |
| Salt air / coastal exposure | Non-organic, holds up well near the bay | Organic wood fiber core is more exposure-sensitive | Generally stable, but fasteners and trim need care |
| Finish durability | Factory ColorPlus finish, long color life | Factory or field-primed; repaint cycles vary | Color molded in; can fade or chalk over time |
| Fire resistance | Non-combustible | Combustible wood-based product | Combustible, can deform in heat |
| Look on older/craftsman homes | Crisp board lines, holds shadow lines well | Similar look achievable | Flatter profile, less depth to the reveal |
We don't install the two right-hand columns — we're a Hardie-only crew — but homeowners comparing bids deserve to see honestly where the trade-offs sit. The short version: in a wet, shaded, salt-air environment like Sehome's, the moisture and fire performance of fiber cement is the deciding factor for us.
Cost Factors on a Sehome Board & Batten Project
Board and batten typically runs somewhat higher than plain lap siding because of the extra trim material and labor — every seam gets a batten, and every batten gets fastened and finished correctly. The real cost drivers on a Sehome job usually come down to:
- How much of the existing siding and sheathing has hidden moisture damage once it's opened up
- Whether a rainscreen gap needs to be added or is already accounted for in the wall assembly
- Access — hillside lots, tight side yards, and mature landscaping around older Sehome homes can add setup time
- How much trim, corner, and transition work is involved where board and batten meets other siding profiles or roof lines
- Color and accessory selection within the Hardie ColorPlus lineup
We give a firm, written number after an on-site look — not a phone estimate — because the condition behind the old siding is usually the biggest variable.
Our Process
1. On-site inspection, including opening a small test section where the existing siding is questionable, so we know what's actually behind it before we quote.
2. Written scope covering tear-off (or overlay, when the substrate genuinely supports it), moisture barrier, any rainscreen furring, Hardie board and batten materials, trim, and flashing detail.
3. Removal and inspection of sheathing, with repairs addressed and documented before new siding goes on — not papered over.
4. Installation to Hardie's fastening and clearance specifications, with particular attention to grade clearance and flashing given how much rain this area sees.
5. Final walk-through covering caulk lines, trim, and touch-up, plus what maintenance (if any) the homeowner should expect.
Maintenance in a Moss-Prone Neighborhood
Fiber cement board and batten is low-maintenance, not no-maintenance, especially under Sehome's tree canopy. A simple annual routine keeps it performing:
- Rinse siding and battens down once a year, focusing on shaded north- and east-facing walls where moss and algae take hold first
- Keep gutters clear so overflow doesn't run down the face of the siding
- Trim back shrubs and branches that hold moisture against the wall or block airflow
- Check caulking at trim and window transitions every couple of years and touch up any gaps before wet season
- Watch for any staining at the bottom edge, which can signal a grade or splash-back issue worth correcting early
Why a Local Crew Matters Here
A crew that already works Sehome's streets knows the practical stuff a generic estimate misses — which lots need extra flashing because of hillside runoff, which older homes have sheathing that needs a closer look before a number gets written, and how much a mature tree canopy changes drying time on a given wall. That local knowledge shows up in the parts of the job you don't see: the flashing detail, the rainscreen gap, the grade clearance — not just the finished color.
If you're weighing board and batten siding for a home in Sehome, we're glad to take a look and give you a straight, no-pressure estimate using the form below.