Lynden Siding An Honest Look at LP SmartSide
Homeowners in Lynden ask us about LP SmartSide often enough that we think it deserves a straight answer, not a sales pitch. LP SmartSide is a legitimate engineered wood siding product, and plenty of contractors install it well. We don't. This page explains what it does right, where it runs into trouble in Whatcom County conditions, and why our crews only put James Hardie fiber cement on the homes we work on.
What LP SmartSide Gets Right
LP SmartSide is a strand-based engineered wood product, built from wood strands bonded with resin and coated with a treated overlay designed to resist moisture and fungal decay better than raw dimensional lumber. It's lighter than fiber cement, which can make it easier and faster to install. It takes paint well, comes in lap, panel, and trim configurations, and generally costs less upfront than fiber cement siding. For a lot of homes and a lot of budgets, it's a reasonable product. We're not disputing that.
Where the Trade-Offs Show Up
It's Still Wood at Its Core
Underneath the resin-saturated overlay, LP SmartSide is strand wood — an organic material. It's engineered to resist moisture better than untreated lumber, but it isn't immune to it. Any cut edge, nail penetration, or seam that isn't field-caulked and maintained correctly becomes a place where water can start working its way in. In a region like Lynden, where driving rain off the Pacific rolls through for months at a stretch and salt-tinged air moves in off the Sound and Bellingham Bay, those small maintenance gaps don't stay small for long.
Field Maintenance Isn't Optional
LP's warranty coverage is conditioned on caulking, painting, and maintaining the siding on a schedule — cut edges sealed, seams caulked, touch-up paint applied before the factory finish wears through. That's a reasonable ask on paper, but in practice it means the homeowner (or a maintenance contractor) has to stay on top of it year after year. Whatcom County's long wet season and extended moss season put that maintenance schedule to the test. Missed a caulk line two winters ago? That's often where the swelling starts.
Installation Sensitivity
Because the product's performance depends so heavily on correct sealing at every cut, joint, and fastener, LP SmartSide is less forgiving of installation shortcuts than fiber cement. A rushed crew or a missed detail on one panel can turn into a moisture problem that isn't visible until the siding is opened up years later. We've seen enough of that on homes we've been called to assess that we decided we didn't want to build our reputation on a product where the margin for error is that thin.
Moss, Algae, and Coastal Air
Lynden sits in a part of Whatcom County that gets a lot of shade, a lot of moisture, and a long moss season on north-facing walls and anything under tree cover. Organic-substrate siding gives moss and algae more to hold onto over time than an inorganic material does, especially once the factory coating starts to wear at high-exposure areas. It's not a dealbreaker for everyone, but it's a real maintenance factor we didn't want to be responsible for after the fact.
Why We Install James Hardie Instead
James Hardie fiber cement is made from cement, sand, and cellulose fibers — there's no wood substrate to swell, rot, or feed fungal growth. It's non-combustible, which matters to insurers and homeowners alike, and Hardie's HZ5 product line is engineered specifically for the kind of freeze-thaw, moisture-heavy climate we get here in the Pacific Northwest. The ColorPlus factory finish is baked on and warranted separately from the substrate, so touch-up painting isn't a recurring maintenance chore the way it is with field-painted products. Hardie also backs the product with a strong, transferable limited warranty that isn't contingent on a strict maintenance calendar the way engineered wood warranties tend to be.
None of this means LP SmartSide is a bad product — it means we made a call, years ago, to standardize on one material we trust to hold up against Whatcom County's salt air, driving rain, and moss without asking homeowners to babysit it. Fiber cement costs more going in. We think the trade-off is worth it for a siding job most people only want to do once.
If you're weighing siding options for a home in Lynden or anywhere else in Whatcom County, we're happy to walk through what we see on the exterior and give you a straight answer — no pressure, no upsell. Reach out for a free estimate and we'll tell you what we'd actually recommend for your house.