Sunnyland Board & Batten Siding Installation

Board & Batten Siding Built for Sunnyland's Weather, Not Just Its Look

Board and batten has a strong following in Sunnyland and the surrounding Bellingham neighborhoods, and it's easy to see why. The vertical lines read as farmhouse-modern on newer builds and fit naturally alongside the craftsman and cottage-style homes that make up much of this part of Whatcom County. But board and batten is not a purely cosmetic choice — it's a siding system with its own moisture path, its own seams, and its own failure points. Installed correctly, it holds up well in a marine climate. Installed the way it's often rushed on a budget job, it becomes one of the faster-failing siding styles in this part of the state. This page is about what "correctly" actually means for a Sunnyland home, and why the climate here makes that distinction matter more than it would somewhere drier.

Why This Style Carries Extra Risk in a Bellingham Bay Climate

Sunnyland sits close enough to Bellingham Bay that salt-laden air is a real factor, and it sits inside a weather pattern that delivers a long stretch of wet, wind-driven storms every fall and winter. Board and batten's vertical boards and narrow battens create more linear seams per square foot of wall than horizontal lap siding does. Every one of those seams is a place water can be pushed if the assembly behind it isn't built to shed and drain properly.

Salt Air and Fastener Corrosion

Homes closer to the bay see faster corrosion on exposed metal — fasteners, flashing, trim fasteners at butt joints. Cheap or under-spec fastener choices show surface rust and staining within a few years in this kind of air, and rust streaks running down a batten are one of the most common complaints we hear about older board and batten jobs in this area.

Driving Rain and Vertical Seams

Wind-driven rain in a Pacific storm doesn't just fall straight down — it gets pushed sideways and upward under trim and behind battens if there's no drainage plane behind the cladding. On a horizontal lap profile, gravity does a lot of the work moving water down and off. On board and batten, a batten that isn't fastened and flashed correctly can actually funnel water toward the seam it's supposed to protect.

Moss, Algae, and a Long Wet Season

Whatcom County's wet season runs long, and shaded, north-facing walls — common on lots with mature trees, which describes a lot of Sunnyland — stay damp for extended stretches. Any siding material that holds moisture at the surface, rather than shedding it, becomes a host for moss and algae growth over time. That's a maintenance and appearance issue on any siding, but on board and batten it's compounded by the battens themselves, which create narrow ledges where organic debris and moisture collect if they aren't installed with the right reveal and drainage.

What a Correct Board & Batten Installation Actually Involves

The visual result of board and batten — vertical boards, narrow battens over the seams — can be achieved a dozen different ways, and most of the cheap ones skip the parts you can't see once the job is done. A correct installation includes:

• A drainage plane (weather-resistive barrier) installed and lapped correctly behind the field, not just stapled up as an afterthought
• A rainscreen gap — a furring strip system that holds the siding off the wall so water that gets behind it can drain and the wall can dry
• Flashing at every horizontal transition: window and door heads, the base of the wall, any roof-to-wall intersection
• Fasteners sized, spaced, and rated for the cladding weight and the local wind and moisture exposure, not just "whatever's in the gun"
• Battens fastened into framing or furring, not just into the field boards, so they don't work loose and open a gap over time
• Factory-finished boards and battens where possible, so the cut ends and fastener heads — the actual vulnerable points — are the only places relying on field-applied sealant

Skip the rainscreen gap and everything else on this list is working against a wall assembly that can't dry out. That's the single most common shortcut we see on board and batten jobs that failed early in this climate.

Material Comparison for Board & Batten in Whatcom County

Board and batten shows up in several materials, and the material matters as much as the installation. Here's how the common options actually compare under our conditions:

Material	Moisture Behavior	Moss/Algae Resistance	Salt Air Durability	Maintenance
James Hardie fiber cement	Dimensionally stable, doesn't swell or rot when wet	Factory finish resists growth better than raw wood	Non-combustible, doesn't corrode; fasteners are the only metal exposure	Periodic rinse and repaint of caulk lines only
Primed or raw wood	Absorbs moisture at cuts, ends, and any finish failure	Prone to moss and mildew without frequent treatment	Finish breaks down faster in salt-influenced air	Repainting and moisture checks every few years
Vinyl board and batten	Sheds surface water but seams and J-channels can trap moisture behind panels	Can develop algae film in shaded, damp areas	Can become brittle over time; doesn't corrode but can fade and warp	Low, but panel replacement is visible if damaged
Engineered wood (LP-type)	Vulnerable at cut edges and butt joints if not fully sealed	Resistant when intact, but edge swelling invites growth	Moderate; edge sealing is the ongoing concern	Edge inspection and caulk maintenance recommended

We install James Hardie fiber cement exclusively, in a board and batten profile with a factory ColorPlus finish. It's not the only material that can be made into a board and batten look, but it's the one we're willing to warranty and stand behind on a wall that's going to face a Bellingham winter every year it's up.

Our Process for Sunnyland Homeowners

1. On-site assessment. We look at existing siding condition, sheathing moisture where accessible, wall orientation, and shading — a north-facing wall under mature trees gets a different conversation than a south-facing wall in the open.
2. Tear-off vs. overlay decision. Board and batten almost always calls for a full tear-off so the rainscreen gap and flashing details can be built in correctly. We'll tell you plainly if your situation is an exception.
3. Water-resistive barrier and rainscreen installation. This is the step that gets skipped on rushed jobs and is the one we won't skip.
4. Flashing at every penetration and transition — windows, doors, roof lines, the base of the wall.
5. Board and batten installation with manufacturer-spec fastening and batten spacing.
6. Final detailing — trim, caulking at the points designed to need it, and a walkthrough so you know what normal weathering looks like versus what would need a call back to us.

Maintenance Through a Long Moss Season

Fiber cement board and batten is low-maintenance, not no-maintenance. A short seasonal routine keeps it performing the way it's designed to:

• Rinse shaded and north-facing walls once or twice a year to knock back early moss and algae growth before it takes hold
• Keep gutters clear so overflow doesn't run down the wall face and concentrate moisture at specific battens
• Trim back vegetation that keeps a wall section shaded and damp longer than the rest of the house
• Check caulk lines at trim and penetrations annually — this is the one component that does age faster than the siding itself
• Watch for rust streaking at fasteners or trim, which signals it's time to have the fastener or flashing detail looked at

Why a Crew That Already Works Sunnyland Matters

Board and batten mistakes don't show up on day one. They show up two or three wet seasons in, as staining, soft spots at the base of a wall, or a batten that's started to cup. A crew that's worked this specific part of Bellingham knows which walls in this neighborhood take the worst of the driving rain off the bay, which lots hold shade and moisture longest into the afternoon, and how the City of Bellingham's permitting and inspection process runs for a re-side. That local pattern recognition is what keeps a board and batten job from becoming a callback. We'd rather build the rainscreen and flashing right the first time than diagnose a moisture problem in three years.

Cost Factors to Expect

Board and batten pricing depends on more than square footage. Broad factors that move the number:

Factor	Why It Matters
Tear-off vs. overlay	Full tear-off costs more up front but is what allows a proper rainscreen and flashing package
Wall height and access	Multi-story walls and difficult access add labor time
Existing sheathing condition	Rot or moisture damage found during tear-off may need repair before new siding goes on
Batten spacing and trim detail	Tighter spacing and more window/door trim add material and labor
Color and finish	Factory ColorPlus finishes cost more than field-painted but eliminate a repainting cycle

We give an honest, itemized number after we've actually looked at your walls — not a phone estimate based on square footage alone.

Ready When You Are

If you're weighing board and batten for a home in Sunnyland, we're glad to come take a look, walk the exterior with you, and give you a straight read on what your walls need — no pressure, no hard sell. Use the form below to request a free estimate.