Snohomish LP SmartSide comes up a lot in siding conversations around Snohomish, and it's a fair question to ask about. It's a well-known engineered wood product, it's been on the market for decades, and plenty of homeowners have seen it on neighboring houses or in a big-box store display. We think it's worth explaining honestly why we don't install it, rather than just leaving it off our list without comment.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood siding product — strand board or panel substrate treated with resins and zinc borate for some moisture and insect resistance, then coated with a primer or factory finish. It's lighter than fiber cement, easier to cut and nail without special blades, and it costs less upfront in most markets. For builders working on a tight budget or timeline, those are real advantages, and we're not going to pretend otherwise.
Where it runs into trouble is the core material itself. Underneath the treatment and coating, it's still wood-based. Wood-based products share one fundamental vulnerability that fiber cement doesn't have: if water gets past the surface and stays there, the substrate can swell, soften, and eventually break down. The treatment slows that process — it doesn't eliminate it.
Why That Matters in Snohomish
Snohomish sits in a stretch of Washington that doesn't do siding any favors. Salt air moving in off the water keeps moisture in the environment even on days it isn't actively raining. Winters bring driving rain that comes in sideways rather than straight down, which pushes water into laps, seams, and fastener points a lot harder than a light, vertical rain would. And the region's long moss season means shaded walls and north-facing exposures can stay damp for weeks at a stretch, especially under mature trees or in tight side-yard gaps between homes.
That combination — sustained moisture, driving rain, extended damp periods — is close to the worst-case scenario for any wood-based siding product. It's not that LP SmartSide fails immediately or fails on every house. It's that the margin for error shrinks considerably in a climate like ours. A caulk joint that dries out and cracks, a piece cut short of manufacturer clearance above grade, a flashing detail that's slightly off — on a drier product, that might be a cosmetic issue for years. Here, it's an entry point for moisture that has a lot of opportunities to do damage before anyone notices.
The Maintenance Reality
LP SmartSide's warranty and long-term performance both depend heavily on keeping the factory finish intact and staying on top of caulking at every joint, corner, and penetration. That's not a one-time installation detail — it's an ongoing maintenance commitment for as long as the siding is on the house. Missed touch-ups, sun-faded caulk, or a section that gets nicked during a pressure wash can open a path for water before the homeowner realizes it's happened. In a climate with as much sustained moisture as Snohomish sees, that maintenance schedule isn't optional — it's the thing standing between the product performing as intended and a moisture problem developing behind the wall.
Where LP SmartSide Makes Sense
To be fair to the product, LP SmartSide isn't a bad choice everywhere. In drier climates, on secondary structures, or on projects where budget is the deciding factor and the homeowner understands and is willing to keep up with the maintenance, it can hold up reasonably well. It's a legitimate product from a legitimate manufacturer — it's just not the product we're willing to put our name behind on a primary home exterior in a coastal Washington climate.
Why We Install James Hardie Instead
James Hardie fiber cement is built from cement, sand, and cellulose fiber — there's no wood substrate to swell, rot, or delaminate if water reaches it. It's non-combustible, it holds its shape through wet-dry cycles far better than engineered wood, and the ColorPlus factory finish is baked on and backed by its own warranty against fading and chalking, which matters in a climate that gets a lot of both sun exposure and prolonged dampness in the same year. Hardie also builds climate-specific HZ product lines engineered for regions like ours, rather than a single formulation sold everywhere. Paired with a strong transferable warranty and installation done to manufacturer spec, it's the product we've found actually holds up through everything a Snohomish winter and summer throw at it, without asking the homeowner to maintain caulk lines every season just to keep water out.
Our Recommendation
We understand LP SmartSide's appeal — it's a known name, it's more affordable up front, and it's not a product we'd tell anyone is unsafe or fraudulent. But given what salt air, driving rain, and a long moss season do to wood-based products over time, we don't think it's the right long-term investment for most homes in this area, and we've made the decision not to install it. If you're weighing your options and want a straightforward, no-pressure look at what would actually make sense for your home, we're glad to walk the property and talk through it — reach out for a free estimate.