Birch Bay Siding Siding Built for Custer's Weather, Not Just Its Curb Appeal
Custer sits in that stretch of Whatcom County where Puget Sound weather and Canadian border weather seem to argue with each other most of the year. Homes here take on a steady diet of damp, salt-tinged air drifting in off the water near Birch Bay, driving rain that comes sideways more often than straight down, and a moss season that can run from October clear through May. None of that is dramatic on any given day. It's the accumulation that wears siding down — and it's why the material you choose matters more here than it does in a drier climate.
We're a local exterior contractor working siding, roofing, windows, and decks throughout the Birch Bay and Custer area. On siding specifically, we've made a deliberate choice: we install James Hardie fiber cement siding, exclusively. Not because it's the only decent product on the market, but because after years of tearing old siding off Whatcom County homes and seeing exactly what this climate does to different materials, it's the one we're willing to warranty and put our name behind.
What Salt Air, Rain, and Moss Actually Do to a House
Salt Air
Custer isn't beachfront, but it's close enough to Birch Bay and the Strait of Georgia that airborne salt reaches homes on windy days, especially on west- and northwest-facing walls. Salt is corrosive to fasteners and hardware, and it accelerates the breakdown of coatings and finishes that weren't engineered to handle it. Over years, siding with a weak factory finish will chalk, fade, or lift at the edges faster near the coast than it would ten miles inland.
Driving Rain
Whatcom County doesn't get the heaviest annual rainfall in the state, but it gets a lot of wind-driven rain, which is a different problem than straight-down rain. Wind-driven moisture gets pushed up under laps, into seams, and behind trim if the water-resistive barrier, flashing, and caulking details aren't done right. Siding that swells, warps, or wicks moisture at the edges will fail faster under these conditions than in a calm, dry climate.
Moss and Shade
Between the tree cover common on Custer lots and the long stretch of overcast, wet months, north-facing walls and shaded siding stay damp for extended periods. That's exactly the environment moss, algae, and mildew need to take hold. Porous or organic siding materials give that growth something to root into; dense, factory-sealed fiber cement gives it much less to work with.
Why We Standardized on James Hardie and Stopped Installing Other Products
We used to install a broader range of siding. We don't anymore, and the reason isn't marketing — it's callbacks. The products we walked away from aren't bad products in every application. They're products with trade-offs that this specific climate tends to expose.
| Product | What It Does Well | Where It Struggles Here |
|---|---|---|
| Vinyl siding | Low upfront cost, easy install | Can warp or crack in temperature swings; seams and laps allow moisture behind the panel; thin material shows wind damage |
| LP SmartSide (engineered wood) | Lighter weight, good workability | Wood-based core is vulnerable if any seam, cut edge, or fastener point isn't sealed and stays wet; edge swelling is a known risk |
| Cedar / primed spruce | Natural look, traditional appeal | Needs ongoing refinishing to resist moisture and rot; the constant damp here shortens the maintenance interval significantly |
| Other fiber cement (Cemplank, Allura) | Similar core material to Hardie | We simply don't have the same track record, factory finish system, or local warranty support we get with Hardie |
None of these are unusable products everywhere. But when we weigh install cost against how a material behaves after ten or fifteen wet Whatcom County winters, the math kept pointing the same direction. So we stopped offering the alternatives and put our focus into doing James Hardie installation correctly, every time.
What James Hardie Brings to a Custer Home
James Hardie fiber cement is a cement, sand, and cellulose fiber composite. It's non-combustible, dimensionally stable (it doesn't expand and contract with moisture and temperature the way wood-based products do), and it holds paint and factory finishes far longer than organic materials.
ColorPlus Technology
Most of what we install uses Hardie's ColorPlus factory-applied finish rather than field paint. It's baked on and cured under controlled conditions, which gives a more even, durable finish than anything applied on-site with a brush or sprayer — and it holds up better against the fading and chalking that salt air and UV exposure cause over time.
Climate-Engineered HZ Product Lines
James Hardie builds region-specific formulations, and Whatcom County falls into their HZ5 zone, engineered for the Pacific Northwest's wet, moderate climate. That's a meaningful detail — it means the product going on Custer homes isn't a generic national spec, it's built for the freeze-thaw and moisture cycles we actually see here.
Warranty
Hardie backs its siding with a long, transferable limited warranty, and the ColorPlus finish carries its own separate finish warranty. Transferability matters to homeowners who may sell in the next decade — it's a selling point buyers' agents recognize.
More Than Siding: Roofing, Windows, and Decks
Siding doesn't work in isolation. A house is one connected exterior system, and we handle the other three pieces that interact directly with it.
- Roofing — roof-wall intersections, kick-out flashing, and gutter placement all affect how much water hits your siding and where. A poorly flashed roofline can undermine even correctly installed Hardie siding.
- Windows — window flashing and the siding trim around openings are one of the most common failure points for water intrusion. We integrate window replacement and siding work so those transitions are sealed correctly the first time.
- Decks — ledger board attachment where a deck meets the house is another place moisture likes to find its way behind the wall assembly if it's not detailed properly.
Being able to handle all four means fewer subcontractor handoffs and fewer gaps where two trades each assume the other one sealed a joint.
What Correct Installation Actually Involves
James Hardie siding is only as good as the installation behind it. The material is engineered well; failures almost always trace back to install shortcuts, not the product itself.
Key Details We Don't Skip
- A continuous, properly lapped water-resistive barrier behind the siding, not just tar paper tacked up loosely
- Correct fastener type, spacing, and depth per Hardie's installation specs — over-driven or under-driven nails are a common failure point
- Proper clearance between siding and grade, decks, roofing, and other surfaces so water has somewhere to go instead of wicking upward
- Factory-cut and factory-sealed edges used wherever possible, with field cuts sealed per manufacturer spec
- Flashing integrated at every window, door, and roof intersection before siding goes on, not caulked as an afterthought
Skipping any one of these doesn't usually cause an immediate problem. It causes a problem in year six or eight, after a few dozen wet Whatcom County winters have had time to find the gap.
Signs a Custer Home May Need New Siding
Most siding problems announce themselves gradually. Worth checking for:
- Visible warping, buckling, or gaps at seams and corners
- Soft or spongy spots when pressed, especially near the bottom courses
- Persistent moss or algae staining that comes back quickly after cleaning
- Paint that's peeling, bubbling, or chalking heavily, particularly on west- or north-facing walls
- Rising energy bills that may point to a compromised weather barrier behind the siding
- Visible daylight or drafts around window and door trim
Any one of these alone isn't necessarily urgent. Several at once, or anything involving soft wood, is worth having looked at before it spreads.
Why a Local Crew Matters in Custer
Whatcom County's microclimates vary more than people expect over short distances — a lot going on with fog off Birch Bay, wind funneling through the county, and shaded, tree-covered lots common around Custer. A crew that works this specific area regularly gets a feel for which walls take the worst weather, which lots hold moisture longest, and how to sequence a job around our wet-season windows. That local, repeated experience shows up in the details — the kind that don't get noticed until they either hold up or don't, ten years down the road.
If your Custer home's siding is showing its age, or you're planning ahead rather than reacting to a problem, we're happy to take a look and walk you through what we see — no pressure, no obligation. Reach out using the form below for a free estimate.