Ferndale Kendall's Climate Is Harder on Siding Than It Looks
Kendall doesn't get talked about the way the coastline does, but the same weather system that soaks Ferndale and the rest of Whatcom County reaches every home out here too. Marine air pushes inland off the Sound carrying salt and moisture, Pacific storm systems dump driving, wind-blown rain for months at a stretch, and the tree cover and overcast stretches that define this part of Washington keep siding damp far longer than it would stay damp in a drier climate. That combination — salt-laden air, rain that hits siding sideways instead of straight down, and a moss and algae season that can run eight months of the year — is exactly the environment fiber cement siding was engineered for, and exactly the environment that exposes cheap materials or a sloppy installation.
Homeowners in Kendall aren't fighting a single hard freeze or a single big storm. They're fighting slow, constant moisture exposure, year after year, and the siding system either sheds that water and dries out between rain events or it doesn't. There isn't much middle ground.
What Kendall Homes Actually Need From Their Siding
Before any product or installation detail matters, a siding system out here needs to do three things well:
- Shed wind-driven rain without letting water track behind the cladding at seams, laps, and penetrations.
- Dry out between rain events instead of trapping moisture against the sheathing, which is where rot and mold start.
- Resist moss and algae growth on shaded, north-facing, and tree-covered walls, which in Whatcom County is most walls.
A siding product that's marginal on any one of these will show it within a few years in this climate — not decades. That's the filter we run every material decision through.
Why We Only Install James Hardie Fiber Cement
We install one siding system on every job: James Hardie fiber cement, in the HZ5 formulation engineered for wetter, humid climates like ours. We don't install vinyl, LP SmartSide, Cemplank, Allura, or wood siding — not because those products can't be installed, but because we've made a professional decision about what holds up on Whatcom County homes without asking the homeowner to maintain it aggressively for the next twenty years.
A few specific reasons James Hardie is the standard we hold to:
- Fiber cement doesn't feed mold or moss the way wood-based products can. It's cement, sand, and cellulose fiber — there's no organic wood substrate for fungus to break down, which matters directly in a moss-heavy climate.
- It's dimensionally stable in wet-dry cycling. Wood and wood-composite products expand and contract with moisture; over enough cycles, that movement opens joints and stresses fasteners. Fiber cement moves far less.
- ColorPlus factory finish is baked on under controlled conditions and backed by its own finish warranty, so the color coat isn't relying on field-applied paint holding up against salt air and UV.
- Non-combustible. Not a Whatcom-specific concern the way it is east of the Cascades, but it's one more reason we don't have to qualify our recommendation.
- A real, transferable product warranty that stays credible because the manufacturer engineers specifically for climates like this one, rather than a one-size-fits-all national spec.
None of this means other products are junk — it means we'd rather stand behind one system we trust completely than offer a menu of products with different maintenance burdens and different odds of holding up.
How Hardie's Product Lines Compare
| Material | Moisture behavior in wet climates | Moss/algae resistance | Maintenance | Typical lifespan |
|---|---|---|---|---|
| James Hardie fiber cement (HZ5) | Dimensionally stable, engineered for humid regions | High — non-organic substrate | Low — occasional wash | 30+ years |
| Vinyl | Sheds water but seams and laps can trap moisture behind panels | Moderate — surface growth on shaded walls | Low but can crack/fade over time | 20–25 years |
| LP SmartSide (wood-strand composite) | Engineered wood — sensitive to sustained moisture at cut edges/seams | Lower — organic substrate | Moderate — edge sealing, caulk upkeep | 15–30 years, install-dependent |
| Cedar / primed wood | Absorbs and releases moisture readily | Lowest — organic, needs treatment | High — refinishing cycle | 15–25 years with upkeep |
These are general patterns, not a claim about any single product failing — the differences come down to substrate chemistry and how forgiving each material is of a marginal installation detail, which matters a lot in a climate that rarely lets siding fully dry out.
What a Correct Siding Installation Actually Involves
The material is only half the equation. Most siding problems we get called out to inspect in this area trace back to installation shortcuts, not the product itself. A correct job on a Kendall home includes:
Moisture Management Behind the Cladding
- A continuous weather-resistant barrier (WRB) installed over sheathing, lapped correctly shingle-style so water sheds outward at every seam.
- Proper flashing at every window, door, and roofline transition — this is where most water intrusion actually starts, not through the field of the siding itself.
- Kick-out flashing at roof-wall intersections so runoff is directed into gutters instead of down behind the cladding.
- A drainage gap or rainscreen strategy where conditions call for it, so any moisture that does get behind the siding has a path to drain and air to dry.
Fastening and Fit
- Correct nail placement and fastener spacing per James Hardie's published fastening schedule — over-driven or under-driven nails are one of the most common causes of early siding failure.
- Factory-cut and field-cut edges sealed with the specified primer/sealant before installation, since a raw cut edge is the most vulnerable point on any fiber cement board.
- Proper joint spacing and caulking at butt joints and trim, sized to allow for seasonal movement without opening a gap.
- Correct clearance at grade, decks, and patios so siding isn't sitting in standing water or splash-back.
Any one of these done wrong can undercut an otherwise good product. This is the part of the job that separates a crew that occasionally installs Hardie from a crew that installs it as their only product, every day, on homes dealing with this exact climate.
Our Process for a Kendall Siding Installation
- On-site assessment — we look at existing siding, sheathing condition, moisture staining, and problem areas (shaded walls, roof-wall intersections, grade clearance) specific to your home.
- Tear-off and sheathing inspection — old siding comes off and we check the sheathing underneath for rot or damage before anything new goes on. Water damage found here gets addressed before we close the wall back up.
- Weather barrier and flashing installation — WRB, window/door flashing, and kick-out flashing installed to manage water before the cladding ever goes up.
- James Hardie installation — panels or lap siding installed to manufacturer spec: fastening pattern, joint spacing, sealed cut edges, correct clearances.
- Trim, caulking, and touch-up — trim work finished, joints caulked, any factory-finish touch-up handled with Hardie-matched product.
- Final walkthrough and cleanup — site cleaned, and we walk the finished siding with you before calling the job done.
Cost Factors for Kendall Siding Projects
Every home is different, but the line items that move a siding installation estimate up or down are consistent:
| Factor | Why it affects cost |
|---|---|
| Tear-off scope | Removing existing siding down to sheathing takes more labor than installing over a compliant existing surface |
| Sheathing repair | Rot or moisture damage found during tear-off has to be repaired before new siding goes on |
| Home size and wall complexity | More corners, dormers, and roof-wall transitions mean more flashing detail and labor time |
| Panel vs. lap siding profile | Different Hardie profiles and textures carry different material and labor costs |
| Trim and accessory scope | Full trim replacement adds cost versus reusing sound existing trim |
| Site access | Tight lots, tree cover, or difficult grading can add setup and staging time |
We'll walk your specific home and give you a real number tied to what we actually find — not a generic per-square-foot quote that ignores your home's condition.
What to Check Before You Hire Anyone for Siding Work in Kendall
- Ask what siding product they install and why — a contractor who installs everything has no particular reason to have opinions about what actually performs in this climate.
- Ask how they handle flashing at windows, doors, and roof-wall intersections — if the answer is vague, that's where future leaks come from.
- Ask whether they follow James Hardie's published fastening and clearance specs, or their own shortcuts.
- Ask for the manufacturer warranty terms in writing, and whether it's transferable if you sell the home.
- Ask how recently they've worked in Whatcom County specifically — familiarity with this climate and the local permitting process isn't optional here.
Why a Crew That Already Works Kendall Matters
Siding installed by a crew that only occasionally works this climate tends to get generic details — generic flashing, generic clearance, generic assumptions about how much moisture the wall assembly needs to handle. A crew that works Whatcom County regularly, including Kendall and the surrounding Ferndale area, has already seen what this specific combination of salt air, driving rain, and long moss seasons does to a wall system over time, and builds every detail — flashing, drainage, fastening — around that reality instead of a national average. That's also who you want answering the phone in year eight if something needs a look, not a company that did one job in the area and moved on.
If you're planning a siding project in Kendall, we'd rather walk your home, look at what you're actually dealing with, and give you a straight answer than sell you on a product menu. Reach out for a free, no-pressure estimate using the form below.