Sudden Valley Siding One Product, No Exceptions
Most siding contractors keep a catalog: vinyl for the budget jobs, LP SmartSide for the middle tier, fiber cement for the upsell. We don't work that way. Sudden Valley Siding Company installs James Hardie fiber cement siding and nothing else. No vinyl, no LP SmartSide, no Cemplank or Allura fiber cement, no primed spruce, no cedar. That's not a marketing angle — it's a decision we made after years of tear-offs, warranty calls, and repair jobs on every one of those products in Whatcom County conditions.
Standardizing on one product line means our crews install it correctly every time instead of switching techniques and fastener schedules from job to job. It also means we can stand behind the work without a list of caveats about which product on which wall might not hold up. This page explains the reasoning, not just the conclusion — what Sudden Valley's climate does to siding, where the alternatives fall short, and what the Hardie system actually is.
What This Climate Does to a Wall
Sudden Valley sits against Lake Whatcom with the Puget Sound basin close enough that damp, salt-tinged air rides in on the prevailing westerlies for a good part of the year. Add driving rain that comes sideways off the water during fall and winter storms, and a moss season that can run eight months out of twelve on north- and west-facing walls, and you have a climate that is genuinely harder on exterior siding than most of the country experiences.
Three things matter most for siding performance here:
- Wind-driven rain forces water into laps, seams, and fastener penetrations that would stay dry in a calmer climate — the siding's water-shedding detail matters more than its color or texture.
- Sustained moisture and shade feed moss, algae, and mildew on siding that doesn't dry out quickly between rain events, which is most of Whatcom County's tree-covered lots.
- Freeze-thaw swings, while not as extreme as inland climates, still stress any siding material that absorbs and releases water repeatedly over a winter.
Every material handles those three stresses differently. That difference is the entire basis of our one-product policy.
Why the Common Alternatives Don't Make Our Truck
Vinyl siding
Vinyl is inexpensive and low-maintenance in a dry climate, but it's a thin plastic skin that expands and contracts with temperature and can warp, crack, or blow off in the wind events that come through the county in fall and winter. It doesn't hold paint, so a homeowner is locked into whatever color fades over the years. We won't put a product on a house that we know we can't warranty against wind uplift in a region that regularly sees gusty coastal storms.
LP SmartSide
LP SmartSide is an engineered wood product — strand board with a resin and zinc-borate treatment, not fiber cement. It performs reasonably well when it stays dry and is maintained on schedule, but it is still wood at its core. Cut edges, fastener holes, and any breach in the factory coating are entry points for moisture, and once wood-based siding starts absorbing water in a climate this wet, swelling and edge deterioration follow. We've done enough tear-offs on SmartSide installed a decade or less to not want our name on the next one.
Cemplank and Allura fiber cement
These are legitimate fiber cement products and not junk — the concern isn't the fiber cement formulation itself, it's the factory finish system and the manufacturer's regional engineering. James Hardie is the only major fiber cement maker that produces a climate-specific HZ5 formulation for the Pacific Northwest's moisture profile and backs it with the ColorPlus factory finish and a national installer network with local training. We'd rather install fewer products correctly than juggle finish warranties and installation specs across three different fiber cement brands.
Primed spruce and cedar
Solid wood siding, primed or cedar, is the most maintenance-intensive option in this climate. It needs repainting or refinishing on a real schedule — not "when you get around to it" — or moisture gets behind the finish and rot starts, especially in the shaded, slow-drying spots common on wooded Sudden Valley lots. Cedar has real appeal and can look excellent, but it asks a homeowner to commit to ongoing upkeep that most people underestimate when they choose it.
| Material | Core Material | Moisture Behavior Here | Factory Finish |
|---|---|---|---|
| Vinyl | PVC plastic | Doesn't absorb water, but seams leak and panels can warp or blow off | Color molded in, cannot be repainted reliably |
| LP SmartSide | Engineered wood strand | Vulnerable at cut edges and fastener penetrations once coating is breached | Factory primer, needs field topcoat and maintenance |
| Cemplank / Allura | Fiber cement | Stable material, but finish system and regional engineering vary by maker | Factory or field finish depending on product |
| Cedar / primed spruce | Solid wood | Absorbs and releases moisture readily; rot risk without upkeep | Field-applied, requires scheduled refinishing |
| James Hardie | Fiber cement, HZ5 engineered | Dimensionally stable, resists moisture-driven warping and rot | ColorPlus baked-on finish, 15-year finish warranty |
Inside the James Hardie System
Fiber cement is a mix of cement, sand, and cellulose fiber, cured into a dense, dimensionally stable board. It doesn't expand and contract with humidity the way wood does, and it doesn't soften, warp, or become brittle the way vinyl and engineered wood products can. James Hardie makes several product lines that we mix and match depending on the house:
- HardiePlank lap siding — the standard horizontal lap board, available in several profiles and textures, used on the majority of homes we side.
- HardieShingle — for homes wanting a shingle or shake look without the maintenance of actual cedar shakes.
- HardiePanel — vertical panel siding, often used for board-and-batten sections or accent gables.
- HardieTrim — matching trim boards so the whole exterior envelope, not just the field siding, is fiber cement.
James Hardie also engineers its boards by climate zone. What ships to Whatcom County is the HZ5 formulation, built for regions with sustained moisture exposure — different from the HZ10 product sold in the hot, dry Southwest. That regional engineering is part of why we don't treat "fiber cement" as a generic commodity; the same product name from a different manufacturer isn't necessarily built for this weather.
ColorPlus: Why the Finish Matters as Much as the Board
Most of what fails on a siding job in this climate isn't the substrate — it's the finish. Field-applied paint has to bond to a board on-site, in whatever weather the crew gets that week, and it starts thinning and chalking within a handful of years of driving rain and UV exposure. James Hardie's ColorPlus finish is baked onto the board in a controlled factory environment across multiple coats, which gives it better adhesion and UV resistance than anything applied on a ladder in Whatcom County drizzle. It's backed by its own finish warranty separate from the substrate warranty, and it's the reason Hardie siding tends to hold its color and resist fading and chalking longer than field-painted alternatives.
Fire and Moisture Performance
Fiber cement is non-combustible — it doesn't contribute fuel to a fire the way wood-based or vinyl siding can. That's less of a driving concern here than in wildfire-prone parts of the state, but it's a real, quantifiable advantage that costs a homeowner nothing to have. On the moisture side, Hardie's board is manufactured to resist moisture-driven cupping, splitting, and swelling, and when it's installed with the correct rain-screen gap, flashing, and clearances, it sheds Whatcom County's driving rain instead of trapping it against the wall sheathing.
The Warranty Behind the Product
James Hardie backs its siding with a non-prorated, transferable limited warranty on the substrate, plus a separate warranty on the ColorPlus finish covering fade and chalking. Transferability matters more than homeowners usually expect — if the house sells within the warranty period, the coverage moves with it, which is a real selling point in a market where buyers ask about exterior condition and upkeep history. That warranty structure is contingent on installation to Hardie's published specifications, which is the next section.
What Correct Installation Actually Requires
A warranty is only as good as the install behind it. Fiber cement siding installed wrong — wrong fastener pattern, no rain-screen gap, caulked instead of flashed — will fail regardless of how good the board itself is, and the manufacturer's warranty won't cover a workmanship failure. Before we call a job done, it has to check every one of these:
- Correct minimum clearance from the siding bottom edge to grade, decks, and roof lines
- A drainage gap or rain-screen behind the siding, not direct nailing to sheathing or house wrap
- Manufacturer-specified fastener type, spacing, and penetration depth for the board thickness
- Properly lapped and sealed house wrap or weather-resistive barrier underneath
- Flashing — not caulk — at every window, door, and horizontal trim intersection
- Butt joints backed and sealed per Hardie's published detail, not just butted and caulked
- Factory-cut edges used wherever possible, with field cuts properly sealed
Every one of those details is exactly where poor installations fail first in a wet climate — moisture finds the shortcut, not the field of the wall.
What It Costs to Do It Right
James Hardie siding costs more than vinyl or engineered wood upfront, mostly because of material cost, the labor-intensive install (fiber cement is heavier and requires specific cutting tools and blades), and the trim and flashing detail work that a correct install demands. Where that cost evens out is the maintenance side: no repainting cycle, no edge-swelling repairs, no warping panels to replace.
| Cost Factor | What Drives It |
|---|---|
| Material | Fiber cement board and ColorPlus finish cost more per square foot than vinyl or LP SmartSide |
| Labor | Heavier material, specialized cutting equipment, and detailed flashing work take longer to install correctly |
| Trim and accessories | Matching HardieTrim, proper flashing, and rain-screen materials add to the scope versus a bare-minimum install |
| Long-term maintenance | No repainting cycle required; occasional gentle washing to manage moss and algae in this climate |
If you're weighing siding options for a home in Sudden Valley or elsewhere in Whatcom County, we're glad to walk your specific house — sun exposure, tree cover, current siding condition — and give you a straight answer on what it needs. Reach out for a free, no-pressure estimate and we'll show you exactly what a correct Hardie install looks like on your walls.