Chuckanut Exterior What LP SmartSide Actually Is
LP SmartSide is an engineered wood siding product made from wood strands bonded with resin, treated with a zinc borate compound for insect and decay resistance, and finished with a factory primer or overlay coating. It's a legitimate, well-engineered product. It's lighter than fiber cement, easier for some crews to cut and nail, and it typically costs less installed. For certain budgets and applications, it's a reasonable choice, and we're not going to pretend otherwise.
That said, this company made a decision several years back to install only James Hardie fiber cement siding on the homes we work on. Homeowners in Chuckanut and around Whatcom County deserve to know why, so here's the honest version — not a scare story, just the trade-offs that matter once a product is actually on a wall facing our weather.
Why We Don't Install It
It's Still an Organic Wood Product
Fiber cement is sand, cement, and cellulose fiber — it doesn't have an organic core that can swell, delaminate, or feed decay fungus if moisture gets in. LP SmartSide's core is wood strand. The zinc borate treatment and resin saturation genuinely help it resist rot and insects far better than untreated lumber, but the underlying material is still wood. If water finds a way past the coating — at a cut edge, a fastener hole, or a failed joint — it's getting into wood fiber, not mineral fiber. That's a meaningful difference in a place where the siding sits wet for months at a stretch.
Cut Edges and Seams Need Constant Attention
Every panel, trim board, and lap joint on an engineered wood siding job has cut edges, and every manufacturer of this type of product is explicit that those edges need to be primed or sealed at installation and kept sealed for the life of the siding. Caulk joints need inspection and re-caulking on a schedule. Butt joints, corners, and penetrations for hose bibs, vents, and light fixtures are the spots where water finds its way in if maintenance slips even one cycle. We've seen what happens on wood-based siding systems when a homeowner moves, sells the house, or just gets busy for a few years and that maintenance schedule doesn't get kept.
Warranty Coverage Comes With Strings
LP SmartSide's warranty, like most engineered wood siding warranties, is conditioned on documented maintenance — repainting or recoating within specified intervals, prompt caulk repair, proper installation clearances. Skip a step or fall behind schedule and you can find out the coverage you thought you had isn't there when you actually need it. That's not a knock on the manufacturer; it's just how the product has to be warrantied given what it's made of. We'd rather not put a product on someone's home where the warranty depends on a maintenance calendar the homeowner has to manage for decades.
Our Climate Doesn't Give You Much Room for Error
Chuckanut sits right where Puget Sound air, salt spray, and long, wet Pacific Northwest winters combine. We get driving rain that hits siding sideways, a moss season that runs long and keeps north-facing walls damp well after storms have passed, and salt-laden air off the water that accelerates wear on coatings and fasteners. That combination is tough on any exterior product, but it's particularly unforgiving of anything that depends on an intact coating to keep moisture out of an organic core. A maintenance lapse that might be a cosmetic issue in a drier climate can become a moisture problem here.
A Quick Side-by-Side
| Factor | LP SmartSide | James Hardie Fiber Cement |
|---|---|---|
| Core material | Engineered wood strand | Sand, cement, cellulose fiber |
| Combustibility | Combustible | Non-combustible |
| Moisture sensitivity | Depends on intact coating/sealing | Not organic; won't rot or swell |
| Maintenance to keep warranty | Scheduled recoating/caulk upkeep required | Factory ColorPlus finish, less frequent repainting |
| Upfront cost | Generally lower | Generally higher |
What We Install Instead, and Why
We standardized on James Hardie fiber cement siding because it holds up to exactly the conditions Chuckanut throws at a house. It's non-combustible, which matters more every year given regional wildfire smoke and ember exposure concerns. Hardie's ColorPlus factory finish is baked on and backed by its own finish warranty, so homeowners aren't relying on a repainting schedule to keep coverage intact. Hardie also engineers specific product lines — their HZ5 designation, for example — for climates like ours, accounting for moisture exposure rather than treating the Pacific Northwest the same as a dry inland region. And because the core material isn't organic, the moisture pathways that cause the most trouble for wood-based siding simply aren't the same risk.
None of this means LP SmartSide is a bad product for every situation — it isn't. It means that after years of installing and repairing siding on homes in this specific climate, we decided we'd rather put our name on a system that doesn't ask homeowners to manage a maintenance calendar to keep their siding — and their warranty — intact.
If you're weighing siding options for a home in Chuckanut or elsewhere in Whatcom County, we're happy to walk through what we see on real houses in this climate and why we'd recommend Hardie for yours. Reach out for a free, no-pressure estimate — we'll look at your home's specific exposure and give you a straight answer, not a sales pitch.