Lynden Two Very Different Siding Materials, Often Marketed the Same Way
If you're replacing siding in Lynden, you've probably run into both James Hardie fiber cement and LP SmartSide in your research. Both get pitched as durable, low-maintenance upgrades from vinyl or aging wood. Both come in lap, panel, and trim profiles. Both look good in a showroom display. But underneath the marketing, they're built from fundamentally different materials that behave differently once they're on a house exposed to Whatcom County weather for fifteen, twenty, thirty years.
This page lays out how each product is made, where each one holds up and where it doesn't, and why our crews install James Hardie exclusively. We're not going to tell you LP SmartSide is junk — it isn't. We're going to tell you honestly why it's not what we put on homes.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product. Strands of wood are bonded with resin under heat and pressure into a substrate, then coated with a wax-based moisture barrier and a resin-saturated overlay called SmartGuard. It's manufactured to resist fungal decay and termites better than raw dimensional lumber, and LP backs it with a warranty when installed and maintained per their specs.
What LP SmartSide gets right:
- Workability — it cuts, nails, and handles like wood, which keeps labor straightforward and material costs lower than fiber cement.
- Weight — significantly lighter than fiber cement, which can simplify handling on multi-story installs.
- Impact resistance — engineered wood strand product holds up reasonably well to incidental impact.
- Upfront cost — typically the cheaper option per square foot installed, which matters on a budget.
Those are real advantages, and for some homeowners in some climates, that trade-off makes sense. Whatcom County isn't the climate where it makes the most sense.
Where an Engineered Wood Product Struggles in This Climate
Lynden sits in the Nooksack River valley, close enough to Bellingham Bay and the Salish Sea that salt-laden air is a real factor on exterior materials, and squarely inside a Pacific Northwest weather pattern that means driving rain off and on for eight or nine months a year. Add the tree cover and shade common on Whatcom County lots and you get a long moss and algae season — surfaces that stay damp far longer than they would in a drier climate.
LP SmartSide is still wood at its core. The resin treatment and SmartGuard overlay are real protection, but they protect a wood substrate, and wood substrates are moisture-sensitive by nature. The vulnerable points aren't the flat field of the panel — it's the cut edges, the seams, and any place a fastener or flashing detail is even slightly off:
- Every field cut exposes untreated wood strand core that has to be sealed with primer or caulk on-site, correctly, every time, by whoever is holding the saw that day.
- Butt joints and panel seams need ongoing caulk maintenance — caulk that will eventually crack, shrink, or pull away, especially under repeated wet-dry cycling.
- Manufacturer warranties on engineered wood siding are typically conditioned on a maintenance schedule — recaulking, repainting, prompt repair of any damage — that has to be documented and kept up by the homeowner.
- Moss and algae that sit on a wood-based surface through a long damp season create a moisture-retentive layer right against that substrate, which is a different risk profile than moss sitting on an inert cement panel.
None of this means every LP SmartSide installation fails. Plenty hold up fine when installation and maintenance are done exactly right, every year, for decades. But "exactly right, every year, for decades" is a high bar, and it's a bar that falls on the homeowner to keep clearing long after the installer has moved on.
What James Hardie Fiber Cement Is Made Of
James Hardie siding is cement, sand, and cellulose fiber, cured into a rigid, non-combustible board. There's no wood strand core to protect from moisture intrusion — the material itself doesn't rot, doesn't feed fungal growth, and isn't a food source for insects. That's the starting advantage, and it's a material-level difference, not a coating-level one.
Engineered for This Specific Climate
James Hardie manufactures regional product formulations matched to climate zones, and the HZ5 line is engineered for the wetter, more temperate parts of the country — the zone Whatcom County falls into. The formulation accounts for the freeze-thaw and moisture-cycling pattern that's normal here rather than treating the Pacific Northwest the same as Phoenix.
ColorPlus Factory Finish
Most of what we install uses Hardie's ColorPlus finish — a color baked on at the factory under controlled conditions, not painted on site. That matters directly for the maintenance question above: a factory finish resists fading and chipping far longer than field-applied paint, and Hardie backs ColorPlus with its own finish warranty separate from the substrate warranty.
Side-by-Side: The Factors That Actually Matter Long-Term
| Factor | James Hardie Fiber Cement | LP SmartSide |
|---|---|---|
| Core material | Cement, sand, cellulose fiber | Engineered wood strand |
| Combustibility | Non-combustible | Combustible (wood-based) |
| Moisture behavior | Does not rot; dimensionally stable when wet | Wood substrate; relies on coatings and sealed edges |
| Cut-edge exposure | Requires sealing at cuts, lower risk if missed | Requires primer/caulk at every field cut, higher consequence if missed |
| Factory finish option | ColorPlus baked-on finish available | Factory-primed; topcoat typically field-applied or repainted over time |
| Typical installed cost | Higher | Lower |
| Weight / handling | Heavier, requires proper fastening and scoring tools | Lighter, easier to handle and cut |
| Warranty structure | Long-term, product warranty plus separate finish warranty | Long-term, typically maintenance-conditioned |
Installation Quality Matters for Both — But the Stakes Differ
It's worth being straight about this: badly installed Hardie siding will also fail early. Fiber cement that's face-nailed instead of properly fastened, installed without correct clearance off grade or hard surfaces, or hung with unsealed butt joints will let moisture in just like any other siding installed wrong. Good installation is non-negotiable no matter what material is on the truck.
The difference is what happens after a small installation or maintenance lapse. On fiber cement, a missed caulk joint or a scuffed cut edge is a cosmetic or minor moisture issue on an otherwise inert material. On an engineered wood product, the same lapse exposes a substrate that can absorb water and begin to break down if it isn't caught and corrected. Fiber cement gives you more margin for the inevitable small things that get missed on a real job, on a real house, in a climate that rains sideways off the water half the year.
What This Means for Your Warranty in Practice
Read the fine print on any siding warranty before you sign a contract, not after. LP's warranty coverage on SmartSide is real, but like most engineered wood products it comes with maintenance obligations — recaulking intervals, repainting intervals, prompt repair requirements — that if skipped can affect a claim. James Hardie's warranty is also conditioned on proper installation, but the substrate itself isn't degrading in the way a wood-based product can, which is a meaningfully different long-term position for a homeowner who doesn't want siding maintenance to become a recurring chore.
A Practical Checklist Before You Choose
Whatever siding you're considering, and whoever you hire, ask these questions before signing anything:
- What is the core material, and how does it behave when it stays wet for extended periods?
- What maintenance schedule does the manufacturer's warranty actually require, and what voids it?
- Is the finish factory-applied or field-applied, and what's the separate warranty on that finish?
- How does the installer handle cut edges, butt joints, and clearance off grade and roofing?
- Is the product rated or formulated for a wet, maritime climate zone, or is it a generic national spec?
- Does the installer specialize in this specific product, or install several competing systems?
Why We Standardized on Hardie
We made a decision as a company to install James Hardie fiber cement exclusively rather than offering a menu of siding materials. That's a deliberate trade — we give up some flexibility on upfront price for customers, and we say no to jobs where a homeowner wants LP SmartSide, vinyl, or another wood-based product. We do that because after years of installing and repairing siding in Whatcom County's specific mix of salt air, driving rain, and long damp seasons, fiber cement is the material we trust to still look right and perform correctly two decades from now with the kind of maintenance most homeowners actually keep up with — not the maintenance schedule they intend to keep up with when the siding is new.
If you're weighing James Hardie against LP SmartSide, or against any other product, for your Lynden home, we're glad to walk through your specific house — sun exposure, tree cover, wall assembly, and budget — and give you a straight answer, not a sales pitch. Reach out for a free, no-pressure estimate using the form below.