Semiahmoo Siding LP SmartSide Is a Real Product With Real Strengths
Before we explain why we don't install LP SmartSide, we want to give it credit where it's due. LP SmartSide is engineered wood siding — strand-based substrate bonded with resins, coated with a wax-impregnated overlay, and finished with a primer designed to resist moisture better than old-school OSB or plain wood siding. It's lighter than fiber cement, easier on saw blades, and less brutal on installers' backs. Homeowners like the look of it, and in the right climate, installed exactly to spec, it can perform for years. We're not here to tell you it's a scam or that everyone who has it is in trouble. We're here to explain why, as a company that works exclusively in Semiahmoo and the rest of Whatcom County, we decided it wasn't the product we wanted our name attached to.
The Core Issue: It's Still Wood at Its Heart
Strip away the engineering, and LP SmartSide is a wood-based product. Wood strands, wood fiber, wood resins. That's not a knock — wood has been used to side houses for centuries — but it means the product's long-term performance is tied to how well its moisture barrier holds up over the life of the siding, not just at installation. The wax overlay and factory primer are what stand between the wood substrate and the water that hits it. Once that layer is compromised — a nail popped slightly proud, a cut edge left unsealed, a joint that opens up as the house settles — the underlying wood is exposed to the exact conditions it was engineered to resist.
Fiber cement doesn't have that vulnerability because there's no wood fiber to protect in the first place. That single structural difference is the reason most of what follows on this page exists.
Why This Matters More Here Than in Drier Climates
Semiahmoo sits right on the water, and homes here deal with a combination most siding products were never really engineered around: salt-laden air off the bay, driving rain that comes in sideways during winter storms, and a moss season that runs long and wet for much of the year. That combination means siding here isn't just dealing with rain running down a wall — it's dealing with wind-driven moisture that finds horizontal joints and fastener penetrations, salt air that accelerates the breakdown of coatings and sealants, and prolonged damp conditions that give moss and algae the head start they need to establish themselves. A wood-based product depends on every seam, cut edge, and fastener being sealed correctly and staying that way for decades. In a marine climate like Whatcom County's, that's a much higher bar to clear than it is inland.
Installation Sensitivity Is the Real Risk
LP SmartSide's biggest weakness isn't the product on the truck — it's how unforgiving it is of installation shortcuts. The manufacturer's own instructions are specific about field-cut edge sealing, proper flashing details, nailing patterns, and clearance from grade and hard surfaces. Skip or rush any of those steps and you've created an entry point for moisture directly into the wood substrate. The problem is that these mistakes are usually invisible at the time. Nobody sees a poorly sealed cut edge from the ground, and it doesn't cause a visible problem in year one. It shows up in year eight or ten, as swelling, bubbling paint, or soft spots at trim lines — long after the crew that installed it has moved on.
We're not willing to build a business model around a product where a rushed Tuesday afternoon on one job can turn into a moisture problem a homeowner doesn't discover for a decade. Fiber cement gives us a much wider margin for error on the details that are hardest to inspect after the fact.
Maintenance: What You're Actually Signing Up For
Every siding product needs some maintenance — that's true of Hardie too. But the maintenance profile is different, and it's worth being honest about both.
- Repainting cycle: LP SmartSide comes primed, not finished, which means it needs a quality topcoat at installation and repainting on a regular cycle after that — typically sooner in a wet, salt-air climate than the manufacturer's general guidance assumes.
- Caulk and seal maintenance: Joints, butt seams, and trim intersections need to be inspected and re-caulked periodically. Any gap that opens up is a direct path to the wood substrate underneath.
- Cut edge vigilance: Any edge cut on site — around windows, doors, or corners — needs sealant maintained over its life, not just applied once.
- Moss and algae management: In a moss-heavy climate like ours, siding low to the ground or in shaded, damp areas needs periodic cleaning to keep organic growth from holding moisture against the surface.
None of this is disqualifying on its own. But it adds up to a maintenance schedule that a lot of homeowners don't fully understand when they choose the product, and in a marine climate, falling behind on that schedule carries more consequence than it would somewhere dry.
How LP SmartSide Compares to James Hardie on the Factors That Matter Here
| Factor | LP SmartSide (engineered wood) | James Hardie (fiber cement) |
|---|---|---|
| Core material | Wood strand substrate with protective overlay | Cement, sand, and cellulose fiber — non-combustible |
| Moisture vulnerability | Depends on coating and sealant integrity staying intact | Not organic material; far more tolerant of moisture exposure |
| Factory finish | Primed, needs field topcoat and future repainting | ColorPlus factory-baked finish, no field painting required |
| Installation sensitivity | High — cut edges and seams must be sealed correctly | Lower risk profile; still requires correct installation but more forgiving |
| Fire resistance | Combustible wood-based product | Non-combustible |
| Typical warranty structure | Manufacturer warranty, often with maintenance-dependent terms | Strong transferable warranty backing the ColorPlus finish and substrate |
| Performance in marine/salt-air climate | Requires diligent maintenance to hold up long term | Engineered HZ product lines built for wet, humid conditions |
Why We Standardized on James Hardie Instead
We didn't choose Hardie because it's the only product that exists — we chose it because, after years of doing exterior work on homes in this specific climate, it's the one we trust to still look and perform the way it should ten and twenty years out, without asking the homeowner to stay on top of a demanding maintenance schedule to get there. A few specific reasons:
Non-Combustible Core
Hardie's fiber cement composition means there's no organic wood fiber for moisture to eventually compromise, and it carries a fire-resistance profile that wood-based products simply can't match.
ColorPlus Factory Finish
Instead of a primed surface that needs field painting and future repainting, Hardie's ColorPlus finish is baked on at the factory under controlled conditions, which holds color and resists fading and chipping better than a field-applied topcoat.
Climate-Engineered Product Lines
Hardie makes HZ10 product specifically engineered for the kind of wet, moderate climate we have in Whatcom County — it's not a one-size-fits-all product adapted after the fact.
Warranty Backing
Hardie's transferable warranty structure reflects the confidence they have in the product's long-term performance, which matters to us because we're the ones standing behind the installation.
What This Means If You're Comparing Bids
If you're getting quotes and one contractor is proposing LP SmartSide at a lower price point, that's a legitimate product and a legitimate business decision on their part — it's not automatically a red flag. What we'd encourage you to ask, regardless of which contractor or product you go with, is how they handle cut-edge sealing, what their nailing and flashing details look like, and what the manufacturer's maintenance requirements actually commit you to over the life of the siding. Those answers matter more than the brand name on the product.
- Ask what topcoat and repainting schedule the product requires in a marine climate
- Ask how cut edges and field seams are sealed, and who's responsible for maintaining that seal
- Ask whether the warranty is contingent on a maintenance schedule you'll need to document
- Ask how the product performs specifically in salt air and high-moss conditions, not just "wet climates" generally
- Compare the full-life cost, including repainting, not just the installed price
We made our decision based on wanting a product that holds up in Semiahmoo's specific mix of salt air, driving rain, and moss without requiring the homeowner to manage a strict maintenance calendar to keep the warranty intact. That's why fiber cement is the only thing we put on houses.
If you'd like to talk through what's actually on your house right now, or compare options for a siding project, we're happy to take a look and give you a straight, no-pressure estimate.