Whatcom County What LP SmartSide Is (and What It Gets Right)
LP SmartSide is an engineered wood siding product made from strands of wood fiber bonded with resin under heat and pressure, then treated with a proprietary process the manufacturer calls SmartGuard to resist fungal decay, termites, and moisture uptake. It comes in lap boards, panels, and trim, and it installs faster than fiber cement because it's lighter and cuts with standard woodworking blades without the silica dust concerns of cement-based products.
We want to be upfront about this: LP SmartSide is a legitimate, engineered building product, not a cheap knockoff. It has real engineering behind it, a national dealer network, and homeowners across the country have had it on their homes for years without major issues. When we say we don't install it, we're not saying it's junk. We're saying that after weighing what it asks of a home in this specific climate against what we're willing to stand behind, we made a different call.
The Core Trade-Off: It's Still an Engineered Wood Product
Strip away the branding and SmartSide is, at its core, wood. Wood fiber, wood resin, wood behavior. That means it expands and contracts with moisture and temperature, it can swell at cut edges if they aren't fully sealed, and if water gets behind it or sits against an unsealed edge long enough, the wood substrate can eventually take on moisture the way any wood product can. The SmartGuard treatment slows that process — it doesn't eliminate the underlying physics of wood.
Fiber cement siding, by contrast, is Portland cement, sand, and cellulose fiber pressed and cured into a rigid board. It doesn't have organic wood sugars for fungus to feed on, it doesn't swell at a cut edge the same way, and it's inert to the moisture cycling that engineered wood has to be engineered around. That's not a marketing distinction — it's a difference in what the material is made of.
Where the Difference Actually Shows Up
- Cut edges and field cuts: Every field cut on SmartSide has to be primed and sealed before installation, every time, with no exceptions. Miss one and that's the spot where moisture finds a way in.
- Butt joints and seams: These need to be caulked and maintained as part of routine upkeep — caulk is a wear item, not a permanent seal.
- Ground clearance and splash zones: Wood-based siding needs strict clearance from grade, decks, and roof lines where it can stay damp longer.
- Long-term surface stability: Fiber cement doesn't rot, and it holds paint and factory finishes differently than an engineered wood substrate does.
Why Whatcom County's Climate Raises the Stakes
Every siding material has a climate it performs best in, and every climate has products it's less forgiving of. Whatcom County sits right on Bellingham Bay with salt-laden air moving inland, driving rain that comes in sideways off the Sound during winter storms, and a moss season that can stretch from October through May in the shaded, damp corners of a lot. That combination — persistent moisture, salt exposure, and long stretches without real drying time — is exactly the kind of environment where any product's weak points get found.
Salt air accelerates the breakdown of caulk and sealants faster than it does inland, which matters a great deal on a product where seams and cut edges depend on sealant integrity holding up year after year. Driving rain finds gaps in flashing and trim details that might never get tested in a drier climate. And moss and algae don't just grow on roofs here — they'll colonize any siding surface that stays damp and shaded long enough, and how a material handles that sustained dampness over years, not weeks, is the real test.
None of this means SmartSide can't be installed correctly in Whatcom County. It means the margin for error is smaller here than it is in a drier, milder region, and every detail — priming, caulking, flashing, clearance — has to be done right, every time, with no shortcuts and no skipped steps.
Installation Sensitivity: The Detail Work Has to Be Perfect
This is really where our decision comes from. SmartSide's manufacturer publishes a detailed installation guide, and when it's followed to the letter, the product performs as designed. The problem is that "followed to the letter" is a high bar that depends entirely on the crew, the job site conditions, and whether every single cut edge gets primed before it goes on the wall — not most of them, all of them.
| Installation Detail | LP SmartSide Requirement | James Hardie Fiber Cement |
|---|---|---|
| Field-cut edges | Must be primed/sealed before install, no exceptions | No priming required at cut edges |
| Caulking at seams/butt joints | Required, and requires ongoing maintenance | Minimal caulking; joints designed to shed water |
| Ground/grade clearance | Strict clearance critical to prevent moisture wicking | Clearance still matters, but material won't wick and rot the way wood can |
| Finish | Field-primed, typically field-painted or pre-finished | Factory-baked ColorPlus finish on most lines |
| Fire classification | Combustible wood-based material | Noncombustible per ASTM E136 |
We're a small crew, not a factory line, and we'd rather build our process around a material where the margin for a missed detail doesn't determine whether the siding lasts 15 years or 40.
Maintenance Reality Over the Ownership Life
SmartSide's upkeep isn't dramatic, but it is real and it's recurring. Caulked joints need inspection and re-caulking as they age and as the salt air here accelerates sealant breakdown. Field-applied paint finishes need repainting on a cycle, typically inside 10 years depending on exposure, which is sooner than the factory-baked finish on most Hardie products. And because it's a wood-based product, any spot where water does get past a seal needs to be caught and addressed before it spreads, rather than being something you can let slide a season.
Homeowners who go into SmartSide with eyes open to this maintenance rhythm can do fine with it. The issue we run into as installers is that most homeowners don't think about siding again once it's up — they expect to paint the trim occasionally and otherwise forget about it. That expectation matches fiber cement's factory finish a lot better than it matches an engineered wood product that depends on maintained seals.
Warranty Structure: What's Actually Covered
LP backs SmartSide with a limited warranty, but like most siding warranties, it has conditions tied to correct installation per their published details, and it prorates over time. If a cut edge wasn't sealed, or a joint wasn't caulked to spec, that can affect a claim down the road — and it's the installer's workmanship, not just the material, that the warranty is really testing.
We install Hardie's product lines with their factory ColorPlus finish, which carries a separate finish warranty on top of the product warranty, and because fiber cement isn't asking installation crews to hit a perfect primed-edge standard on every single cut to avoid moisture problems, there's less of the workmanship-dependent risk that can complicate a wood-based product's warranty coverage over the life of the home.
Why We Standardized on James Hardie Fiber Cement
We made a business decision to install one siding system and install it well, rather than offer several products and be mediocre at all of them. James Hardie's fiber cement lines are engineered specifically for regional climate zones — their HZ5 product line is built for climates like ours with sustained moisture exposure — and the material itself is noncombustible, doesn't feed fungal growth, and holds its factory-applied ColorPlus finish for years without the field-painting cycle wood-based products need.
That's not a knock on every other product on the market. It's that after years of installing siding on homes exposed to Bellingham Bay's salt air and Whatcom County's wet winters, fiber cement is the material we trust to perform with the least dependence on perfect field conditions and flawless caulk maintenance. When we put our name behind an installation, we want the material doing a lot of the work for us — not asking us to be perfect on every cut edge and every seam to keep a home dry.
Cost Considerations
| Factor | LP SmartSide | James Hardie Fiber Cement |
|---|---|---|
| Material cost | Generally lower upfront | Moderate to higher upfront |
| Installation labor | Faster, lighter material to handle | More labor-intensive, heavier material |
| Finish maintenance | Repainting cycle typically needed within 10 years | Factory finish designed to last significantly longer before repainting |
| Long-term upkeep | Ongoing caulk/seam maintenance | Lower ongoing maintenance burden |
The lower upfront cost of engineered wood siding is real and shouldn't be dismissed — for some budgets and some projects it's a reasonable trade-off. We just don't think it's the right trade-off for homes exposed to this county's combination of salt air, driving rain, and long damp stretches, which is why it's not the product we put our name behind.
A Practical Checklist for Comparing Siding Options
- Ask what the material is actually made of, not just the brand name — wood-based, fiber cement, vinyl, and each behaves differently in wet climates.
- Ask whether the finish is factory-applied or will need field painting, and how often.
- Ask what installation details the manufacturer requires (sealed cut edges, caulk maintenance, clearance) and whether those become your ongoing responsibility.
- Ask how the warranty is structured — is it prorated, and does it depend on documented correct installation?
- Ask how the product performs specifically in coastal, high-moisture climates, not just the manufacturer's general claims.
- Get the maintenance schedule in writing before you decide, not after.
Our Honest Bottom Line
LP SmartSide is a real engineered product with a legitimate place in the siding market, and we're not going to tell you it fails on homes — plenty of installations hold up fine when every detail is done right and homeowners keep up with maintenance. Our decision not to install it comes down to what we're willing to guarantee with our own crew's workmanship in Whatcom County's specific mix of salt air, driving rain, and moss-heavy winters. We'd rather install one material exceptionally well than offer several and hope every field cut gets sealed correctly.
If you're weighing siding options for a home anywhere in Whatcom County — Bellingham, Ferndale, Lynden, Blaine, or the surrounding area — we're happy to walk your property, talk through what fiber cement would look like on your home, and give you a straightforward, no-pressure estimate.