Lynden Two Very Different Materials, One Whatcom County Climate
If you're re-siding a home in Lynden, you've probably come across both James Hardie fiber cement and LP SmartSide in your research. Both are marketed as upgrades over vinyl, both come pre-primed or pre-finished, and both are installed by reputable contractors around the region. But they are not the same material, and they don't age the same way — especially under the conditions we deal with here in Whatcom County: salt-tinged air rolling in off the Strait, long stretches of driving rain, and a moss season that can run most of the year on shaded, north-facing walls.
We install James Hardie exclusively. That's not a marketing line — it's a standard we hold to on every job, and it's worth explaining why, because LP SmartSide is a legitimate product with real strengths. Understanding the trade-offs helps you make a more informed decision, whether you hire us or someone else.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product — strand-based substrate (similar in concept to OSB) treated with zinc borate for insect and fungal resistance, then coated with a resin-saturated overlay and primer. It's lighter than fiber cement, easier to cut and nail without special blades, and generally less expensive per square foot. For builders working in drier climates or on budget-sensitive projects, it has a solid track record.
Its core is still wood fiber, though. That's the fact that shapes everything else about how it performs long-term: it can absorb moisture at cut ends, seams, and fastener penetrations if those spots aren't primed, caulked, and maintained exactly as the manufacturer specifies. In a climate with occasional dry summers, that maintenance schedule is forgiving. In a climate where driving rain off the water and a moss-friendly damp season are the norm nine months out of twelve, the margin for a missed caulk joint or a scuffed cut edge gets a lot thinner.
What James Hardie Is
James Hardie siding is fiber cement — a mix of cement, sand, and cellulose fibers, cured into a rigid board. There's no wood fiber core to swell, cup, or take on water at a damaged edge. It's non-combustible (Class A fire rated), holds paint and factory finishes far longer than wood-based products, and doesn't feed moss, mildew, or insects the way organic materials can.
Hardie also engineers its product lines by climate zone — what's called the HZ5 formulation for our region — specifically accounting for moisture exposure like ours. Most of what we install carries the factory-baked ColorPlus finish, which is more consistent and more durable than field-applied paint, and backed by a strong transferable warranty that follows the house, not just the original owner.
Side-by-Side
| Factor | James Hardie | LP SmartSide |
|---|---|---|
| Core material | Fiber cement (inorganic) | Engineered wood strand |
| Fire rating | Non-combustible, Class A | Combustible (wood-based) |
| Moisture behavior | Doesn't swell or rot at cut edges | Can absorb moisture if edges/seams aren't sealed and maintained |
| Maintenance sensitivity | Lower — factory finish holds up | Higher — relies on ongoing caulk/paint upkeep |
| Upfront cost | Higher | Lower |
| Typical warranty | Long-term, transferable | Limited, more conditions attached |
Why This Matters More in Lynden
None of this means LP SmartSide fails as a rule — plenty of installations perform fine for years when the installer is meticulous and the homeowner keeps up with caulking and repainting on schedule. But our region doesn't give a wood-based product much room for error. Salt-laden air off the coast accelerates wear on exposed finishes. Driving rain finds the seams, corners, and butt joints that are the weak points on any lap siding, wood-based or not. And a damp, shaded property in Lynden can grow moss on a north wall in a way that dry-climate installations rarely have to contend with — moss holds moisture against the surface, which is exactly the situation a wood-fiber substrate handles worse than cement.
We've made a business decision to only install a product that doesn't put that burden on the homeowner. Fiber cement isn't invincible — it still needs to be installed to spec, with correct clearances, flashing, and caulking — but the material itself isn't the thing working against you in our climate. That's a meaningful difference over a 20- or 30-year ownership horizon, and it's why every job we take on in Whatcom County goes out with James Hardie.
Making the Right Call for Your Home
If you're comparing bids and one contractor is proposing LP SmartSide at a lower number, that's not necessarily a red flag — it's a legitimate product and a fair price reflects real cost differences. What matters is going in with clear eyes about the maintenance commitment it carries here, and weighing that against a Hardie install that costs more upfront but asks less of you afterward.
If you'd like to talk through what either option would actually look like on your house — colors, siding lines, budget range — we're happy to walk the property with you and put together a free, no-pressure estimate.