Custer What LP SmartSide Actually Is
LP SmartSide is an engineered wood siding — strand-based wood fiber bonded with resins, treated with a zinc borate process (LP calls it SmartGuard) to resist fungal decay and termites, then finished at the factory. It's a legitimate product with real advantages: it's lighter than fiber cement, easier on saw blades, and less brittle to handle on a ladder. In the right climate, installed and maintained correctly, it holds up reasonably well. We're not here to tell homeowners it's a scam or that every SmartSide job fails. It doesn't, and it isn't.
But "the right climate" is doing a lot of work in that sentence, and Custer isn't that climate.
Why Whatcom County Conditions Change the Math
Custer sits close enough to the Strait of Georgia and Puget Sound that salt-laden air is a fact of life on this siding, not an occasional guest. Add driving rain off the water, a moss season that can stretch from October into May, and long stretches of damp weather where painted wood surfaces never fully dry out between storms, and you've got the exact combination that engineered wood products struggle with over the long run.
SmartSide is still wood at its core. The strand fibers are treated and sealed at the mill, but every cut end, every nail penetration, and every seam made on site is a place where that factory protection has been interrupted. Manufacturer installation instructions are explicit about this: cut ends need field-sealed with an approved sealant before installation, and any breach in the factory finish needs to be caught and treated. That's a reasonable standard on paper. In practice, on a house with dozens of butt joints, corner boards, and trim intersections, it only takes a few missed or degraded seals for moisture to start working into the substrate.
Once water gets past the surface on an engineered wood product, the failure mode is swelling, delamination at the edges, and eventually soft spots — problems that don't announce themselves until they're already established. In a climate with this much sustained moisture and salt exposure, that's not a hypothetical risk, it's a maintenance schedule you have to stay ahead of for the life of the siding.
The Maintenance Commitment Is the Real Cost
SmartSide's warranty coverage is conditioned on ongoing maintenance — caulking inspected and refreshed on a schedule, cut edges sealed, paint film kept intact, gutters and flashing kept clear so water isn't sitting against the siding. That's a fair ask from the manufacturer's side; wood-based products have always required this kind of upkeep. The problem is that most homeowners don't sign up for a siding product expecting to inspect caulk joints every year for the next twenty years, and in a place like Custer, where the moss and moisture season is long, the maintenance window for staying ahead of problems is narrower than it would be somewhere drier.
We install siding for people who want to put it on the house and stop thinking about it. That's not a knock on SmartSide as a product — it's an honest statement about what this specific climate demands, and about the kind of siding job we're willing to stand behind with our own name on it.
Appearance and Finish
SmartSide's factory finishes have improved over the years and can look good going on. Where we see the difference over time is in how the finish weathers under sustained damp conditions and salt exposure — chalking, fading, and finish breakdown tend to show up sooner on engineered wood substrates than on fiber cement in the same exposure. On a coastal Whatcom County property, siding faces more UV, more salt, and more standing moisture than the same product would face 50 miles inland, and it shows.
What We Install Instead
We install James Hardie fiber cement exclusively, and the reasoning is directly tied to everything above. Hardie's HZ5 product line is engineered specifically for climates with freeze-thaw cycling, heavy moisture, and marine exposure — which describes Custer about as well as any spec sheet could. Fiber cement is non-combustible, doesn't swell or rot from moisture the way wood-based products can, and the ColorPlus factory finish is baked on and warranted separately from the substrate, so it holds color and resists the chalking and fading we see on painted wood siding in this environment. Hardie's transferable warranty is also written around normal homeowner maintenance rather than a detailed inspection-and-reseal schedule.
None of this means every SmartSide installation is doomed — plenty perform fine, especially with diligent upkeep. It means that after years of working on homes in this specific stretch of coastal Washington, we decided we'd rather install one product we can stand behind fully than offer a menu of options where some are a better fit for this climate than others.
If you're weighing siding materials for a home in Custer or anywhere else in Whatcom County, we're happy to walk your property, talk through what your exposure actually looks like, and give you a straight answer — no pressure, no sales script. Reach out for a free estimate and we'll tell you exactly what we'd recommend and why.