Lynden Siding Ferndale's Climate Is Harder on Siding Than Most Places
Ferndale sits close to the water, in the stretch of coastal Whatcom County where salt-laden air off the Salish Sea meets wind-driven rain rolling in off the Strait. Homes here don't just get wet — they get hit from the side, repeatedly, for months at a stretch, and then sit through long shaded, damp periods that give moss and algae plenty of time to take hold on siding, trim, and roofs. That's a tougher set of conditions than siding faces in most of the country, and it's a big part of why both the material and the installation details matter more out here than they would somewhere drier.
We're based in Lynden and work Ferndale regularly, and we install exclusively James Hardie fiber cement siding — no vinyl, no LP SmartSide, no primed wood. This page focuses specifically on what that means for a Ferndale home: what the local climate demands, what a correct fiber cement installation actually involves, and why it matters to hire a crew that already works this stretch of Whatcom County.
What Salt Air, Driving Rain, and Moss Actually Do to a Wall
Salt Air and Exposed Metal
Salt-laden air corrodes exposed fasteners, flashing edges, and any bare metal trim faster than dry inland air does. On a wall assembly, that damage often shows up first at fastener heads and butt joints — not always visible until it's already causing staining or opening a path for water.
Wind-Driven Rain
Rain that hits a wall sideways instead of just running down it tests every seam, joint, and penetration in a way vertical rain never does. West- and southwest-facing walls tend to take the brunt of this in Ferndale, and any gap in flashing or caulking becomes a route for water to get behind the siding instead of off of it.
Moss and a Long Wet Season
Whatcom County's siding gets very few extended dry stretches. On shaded or north-facing walls, moss and algae take root far more readily than in drier climates. Any siding material that isn't dimensionally stable and resistant to sustained moisture will eventually show it — through swelling, staining, or breakdown at the edges.
Why Fiber Cement Holds Up Where Other Materials Struggle
Wood-based siding — cedar, primed spruce, or engineered wood products — absorbs moisture over time in conditions like ours, which raises the risk of rot at edges and joints and usually means a repainting cycle every several years just to stay ahead of it. Vinyl expands and contracts with temperature swings and can become brittle over time, and it can't be refinished the way a painted surface can once the color fades. Fiber cement is a cement and cellulose-fiber composite that doesn't behave like either of those materials: it doesn't absorb and swell the way wood does, it won't rot, it's non-combustible, and with James Hardie's factory-applied ColorPlus finish it holds its color and coating far longer than a field-painted surface exposed to this much rain. That combination — dimensional stability plus a factory finish built for exterior exposure — is why it's the only siding system we put on homes.
What a Correct Fiber Cement Installation Involves Here
Flashing and the Drainage Plane
Every window, door, and roof-to-wall intersection needs proper flashing, installed over a continuous weather-resistive barrier. In a high-moisture climate like ours, a drainage gap behind the siding is worth the extra step — it gives any incidental moisture that gets past the cladding a way to drain and the wall a chance to dry, instead of trapping it against the sheathing.
Fastening
Fasteners need to match Hardie's fastening schedule for the product and exposure — correct type, spacing, and depth. Overdriven nails crack the board edge and create a spot for water to enter; underdriven ones can work loose over time. This is one of the most common places we see shortcuts taken on siding jobs, and it's also one of the least visible until it fails.
Clearances and Joints
Siding needs proper clearance from grade, roof lines, and decks — generally several inches from grade and one to two inches from roofing — so splashback and roof runoff don't sit against the bottom edge of the boards. Factory-cut ends get sealed, and joints get caulked with a sealant compatible with the ColorPlus finish, not just caulked over and painted to hide a gap.
The James Hardie Products We Install
Engineered for Higher-Moisture Regions
James Hardie formulates its siding differently depending on regional climate. Homes in higher-moisture areas like Whatcom County get the formulation engineered for that level of sustained moisture exposure, rather than the version sold in drier parts of the country. That distinction matters more here than it does in most of the U.S., given how much of the year our walls spend wet.
ColorPlus Factory Finish
The ColorPlus finish is baked on in a controlled factory setting rather than applied on site, which gives more consistent, durable coverage than field painting — and it comes with its own finish warranty separate from the product warranty on the siding itself. In a region where dry painting windows are short and unpredictable, having a factory-cured finish already on the boards before they're installed is a real practical advantage, not just a marketing point.
Our Process, Start to Finish
- On-site walk-through and measurements, including a check of existing wall condition for moisture damage.
- Product and color selection — plank profile, panel siding, and trim details.
- Removal of the old siding and inspection and repair of the sheathing underneath before anything new goes up.
- Installation of the weather-resistive barrier and flashing at every window, door, and roof intersection.
- Siding installation to James Hardie's fastening, clearance, and joint specifications.
- Final walk-through and site cleanup.
We don't install new siding over sheathing that hasn't been checked first. Covering up hidden rot or water damage just locks the problem behind a new wall, and in this climate that problem doesn't go away on its own.
What Affects the Cost of a Fiber Cement Siding Job in Ferndale
Every home is different, but the same handful of factors drive most of the variation in scope and price. Rather than quote a number that won't mean much without seeing the house, here's what actually moves the estimate:
| Factor | Why It Matters |
|---|---|
| Home size and number of stories | More wall area and taller walls mean more material, more labor, and more staging or lift equipment. |
| Condition of the existing siding and sheathing | Hidden moisture damage found during tear-off adds repair work before new siding can go up correctly. |
| Trim and architectural detail | Corner boards, window trim, gable detailing, and multiple siding profiles all add labor time. |
| Site access | Tight lot lines, landscaping, decks, or steep grade around the home affect how easily crews and material can move. |
| Removal and disposal | Tearing off and hauling away old siding material is priced separately from installing the new siding. |
Living With Fiber Cement Siding in Ferndale's Marine Climate
Fiber cement needs far less upkeep than wood siding, but "low maintenance" isn't "no maintenance" in a climate this wet. A short annual routine keeps it performing the way it's designed to:
- Rinse the siding once a year to clear salt residue and organic buildup, especially on shaded or north-facing walls where moss takes hold fastest.
- Keep gutters and downspouts clear so roof runoff doesn't sheet down directly against the siding.
- Trim back shrubs and vegetation touching the walls to keep airflow moving and reduce the shaded, damp conditions moss needs.
- Check caulking at trim and joints once a year and recaulk any spots that have opened up or gone brittle.
- Deal with any impact damage — a ladder scrape, a dropped tool, storm debris — promptly, so the finish and drainage plane stay intact rather than sitting exposed.
Why It Matters That We Already Work in Ferndale
A crew that already works this part of Whatcom County knows which exposures on a typical Ferndale home take the worst of the wind-driven rain, how homes in this area tend to age under these specific moisture and salt-air conditions, and what local permitting and inspection expects. That familiarity shows up in fewer surprises during tear-off, flashing details that account for the direction storms actually come from here, and a finished job that's built for the climate it's going into — not a generic install pulled from a manual written for a drier part of the country.
If you're weighing options for your Ferndale home, we're glad to walk the exterior with you, look at what your current siding is telling us, and put together a straightforward, no-pressure estimate for James Hardie fiber cement siding done right for this climate.