Chuckanut Exterior Two Different Materials, One Big Decision
If you're replacing siding in Chuckanut, two products come up again and again: James Hardie fiber cement and LP SmartSide engineered wood. Both are marketed as durable, low-maintenance upgrades over old cedar or aging vinyl. Both can look good on a house. But they're built from fundamentally different materials, and that difference matters a lot once you factor in what a Whatcom County exterior actually deals with year-round — salt-laden air off Bellingham Bay, long stretches of driving rain, and a moss season that can run from October well into spring.
We install James Hardie exclusively. That's not a marketing line — it's a standard we set after weighing how each material performs over a 20- or 30-year ownership window in this climate, not just how it looks on installation day.
What LP SmartSide Is
LP SmartSide is an engineered wood product: strand-based wood substrate treated with resins and zinc borate for insect and moisture resistance, then coated with a primer or factory finish. It's a real improvement over old-school hardboard siding from the 1980s and 90s, and it has a legitimate following among builders who want a wood look and workable price point. LP backs it with a warranty, and when it's detailed correctly, it holds up reasonably well in drier climates.
The trade-off is what it's made of. It's still wood fiber at its core. Wood fiber absorbs moisture, and once moisture gets in — through a nicked edge, an under-caulked joint, a missed touch-up spot, or just years of exposure at grade — it can swell, delaminate, or soften from the inside out. In a climate like ours, where siding rarely gets a long dry stretch to fully release moisture between rain events, that vulnerability doesn't stay theoretical. It shows up as soft spots near trim, telltale swelling at butt joints, and finish failure at cut edges that weren't sealed in the field.
What James Hardie Is
James Hardie siding is fiber cement: cellulose fiber, sand, and Portland cement pressed and cured into a rigid board. There's no wood fiber to absorb water and swell. It doesn't feed moss the way organic materials or algae-prone coatings can, and it's non-combustible — a genuine advantage during Washington's wildfire season, when embers and airborne debris are a real risk to exterior materials.
Hardie's HZ5 product line is engineered specifically for the wetter, harsher climate zones on the West Coast, which is what we use here. The ColorPlus factory finish is baked on under controlled conditions rather than sprayed on-site, which gives more even coverage and a longer service life before repainting is needed. Hardie backs the material with a 30-year non-prorated limited warranty that's transferable to a new owner if the home sells — a meaningful detail in a market where siding condition affects resale.
Side-by-Side: What Actually Matters
| Factor | LP SmartSide | James Hardie |
|---|---|---|
| Core material | Engineered wood strand, resin-treated | Fiber cement (no organic wood fiber) |
| Moisture behavior | Can absorb and swell if seals/finish fail | Doesn't swell or rot from moisture exposure |
| Fire rating | Combustible | Non-combustible |
| Climate engineering | General-purpose lines | HZ5 line built for Pacific Northwest exposure |
| Finish | Primed or factory-coated, site touch-up common | ColorPlus factory-baked finish |
| Warranty transfer | Limited warranty, terms vary by product | 30-year non-prorated, transferable |
Where Installation Sensitivity Comes In
Neither product is bulletproof to bad installation, and that's worth being honest about. LP SmartSide's real-world performance depends heavily on every cut edge getting field-sealed, every joint getting properly caulked, and clearance at grade being respected — skip any of that and you've created an entry point for the exact moisture problems the resin treatment is meant to prevent. Hardie is more forgiving of small installation misses because the core material itself doesn't absorb and swell, but it still needs correct fastening, clearances, and joint treatment to hit its full service life. The difference is what happens when something does get missed: with fiber cement, a small gap is a small gap. With engineered wood, a small gap can become the seed of a much bigger repair down the road.
Why We Standardized on Hardie
Given the salt air rolling in off the water, the driving rain we get for months at a stretch, and moss that will colonize any surface that stays damp too long, we made the call to install James Hardie fiber cement exclusively. It's not that LP SmartSide is a bad product — it has its place in drier regions and on budget-sensitive projects where the climate math is different. But for homes in Chuckanut and the rest of Whatcom County, we don't think engineered wood gives homeowners the long-term, low-maintenance outcome they're actually paying for. Fiber cement does.
If you're weighing siding options for your home, we're happy to walk through both products in person, explain what we see on real houses in this climate, and give you a straight answer about what will hold up. Reach out for a free, no-pressure estimate — there's no obligation, just an honest look at what your home needs.