Bellingham Siding What LP SmartSide Actually Is
LP SmartSide is an engineered wood siding product — strand board made from wood fiber, resin, and wax, pressed under heat and coated with a resin-saturated overlay before it leaves the factory. It's not vinyl, and it's not the old-school hardboard siding that gave engineered wood a bad name in the 1990s. LP has genuinely improved the formula and the coatings over the years, and in dry or moderate climates it holds up reasonably well when it's installed correctly and maintained on schedule.
We're not writing this page to trash the product. We're writing it because we get asked why we don't install it, and homeowners in Bellingham deserve a straight answer instead of a sales pitch. This company installs James Hardie fiber cement exclusively. Here's the reasoning.
The Core Issue: It's Still Wood
Strip away the branding and LP SmartSide is a wood-based product. Wood — even engineered, resin-treated wood — swells when it absorbs water and shrinks when it dries out. That's a physical property, not a manufacturing defect. LP's treatment process slows water absorption at the face of the board, but the vulnerable points are the same ones that have always plagued wood siding: cut edges, fastener penetrations, butt joints, and any spot where the factory coating gets breached during installation or over the life of the product.
Fiber cement, by contrast, is made from cellulose fiber, sand, and Portland cement. It doesn't have wood's cellular structure, so it doesn't swell, rot, or feed fungal growth the way an organic wood product can. That's the fundamental difference driving everything else on this page.
Where the Vulnerability Shows Up
- Field-cut edges that aren't fully sealed with the manufacturer's specified edge sealer before installation
- Nail and fastener penetrations that go slightly off-spec, creating a micro-gap for water entry
- Butt joints and corners where caulking has failed and wasn't caught during routine maintenance
- Bottom edges near grade, decks, or roof-to-wall transitions where splash-back and standing moisture are constant
Why Bellingham's Climate Raises the Stakes
Whatcom County isn't a climate that forgives sloppy water management. Bellingham sits on Bellingham Bay, which means salt air is a year-round factor on top of everything else — salt accelerates the breakdown of caulking, sealants, and factory coatings faster than a dry inland climate would. Add driving rain off the Strait of Georgia and Puget Sound, wind-driven moisture that hits siding at an angle rather than falling straight down, and a moss and algae season that stretches from fall through spring in our marine climate, and you have conditions that actively hunt for the weak points in any wood-based product.
A product that performs fine in Spokane or eastern Oregon is being asked to do something different here. Bellingham homes hold moisture against their exterior walls for a much larger share of the year, and once water finds a path into engineered wood strand, the clock starts on swelling, delamination at the edges, and eventually structural softening of the board — problems that don't show up for a year or two, which is part of what makes them frustrating for homeowners who did nothing wrong except trust a coating to hold indefinitely.
Installation Sensitivity Is the Real Cost Driver
LP SmartSide's published warranty and performance data assume the product is installed exactly to spec — correct clearance from grade and roofing, correct fastener pattern and depth, field-cut edges sealed before they ever go up, proper caulking at every joint, and manufacturer-approved flashing details at every penetration. That's a lot of steps, and every one of them has to be right, every time, on every board.
We're not questioning any specific installer's competence. We're pointing out that a product this sensitive to installation detail puts the homeowner's long-term outcome in the hands of whoever's crew shows up that day, and it makes callbacks and warranty disputes more likely when something was missed. Fiber cement isn't installer-proof either, but the failure modes when something is slightly off are far less severe — a moisture-related callback on Hardie is much rarer than on engineered wood, because the material itself doesn't absorb and swell the way wood strand does.
| Factor | LP SmartSide (engineered wood) | James Hardie (fiber cement) |
|---|---|---|
| Base material | Wood strand + resin, factory-coated | Cement, sand, cellulose fiber — non-organic |
| Moisture response | Swells/softens if coating or seals are breached | Does not swell or rot; engineered for wet climates (HZ5) |
| Installation sensitivity | High — edge sealing, fastener spec, and caulking must be exact | Moderate — still needs correct technique, but far more forgiving of minor variance |
| Combustibility | Combustible (wood-based) | Non-combustible |
| Coastal/salt air durability | Coating can degrade faster near salt air over time | Cement composition is inert to salt exposure |
| Maintenance | Regular caulk and coating inspection required | ColorPlus factory finish resists fading and chalking; lower touch-up burden |
Warranty Structure: Read the Fine Print
LP SmartSide's warranty is meaningful, but like most wood-based product warranties, it carries conditions tied directly to installation compliance and ongoing maintenance — caulking schedules, coating inspections, and proper clearances. If those conditions lapse, coverage can be reduced or voided, and proving a claim often comes down to documentation the homeowner may not have kept.
James Hardie's warranty on its fiber cement products is structured around a non-combustible, dimensionally stable material that isn't fighting the same moisture-driven degradation clock. It's also transferable to a future homeowner in most cases, which matters if you plan to sell within the warranty period — a real value-add in a market like Bellingham's where curb appeal and low-maintenance exteriors are a selling point.
Cost Isn't the Whole Story
LP SmartSide is typically priced below fiber cement, and we won't pretend that isn't a real consideration for a lot of homeowners. But the honest comparison isn't installed cost alone — it's installed cost against expected maintenance spend and replacement risk over 20-30 years.
| Consideration | LP SmartSide | James Hardie |
|---|---|---|
| Upfront material + install cost | Generally lower | Generally higher |
| Recurring maintenance (caulk, coating checks) | Ongoing, climate-dependent frequency | Lower — factory finish holds up longer between touch-ups |
| Risk if a moisture point is missed | Swelling, softening, possible section replacement | Low — material doesn't absorb and expand the same way |
| Resale/appraisal perception | Varies by buyer | Widely recognized as a premium, durable exterior |
Why We Standardized on James Hardie
We made a decision as a company to install one siding system and install it well, rather than offer five products and hope each crew remembers the different moisture-management rules for each one. James Hardie's fiber cement lines — engineered specifically with HZ5 formulations for wet, humid climates like ours — give us a material that doesn't rely on an intact factory coating to keep water out of the substrate. The ColorPlus finish is baked on at the factory under controlled conditions, which means better fade and chip resistance than field-applied paint, and it's backed by a strong, transferable warranty that isn't contingent on a maintenance checklist most homeowners never see in writing.
For a coastal, moss-prone, high-rainfall place like Whatcom County, that combination — non-combustible, moisture-stable, factory-finished, and warranted for the long haul — is what we're willing to put our name behind. It's also simply what we've gotten good at. Specializing in one system means our crews know its details cold, from flashing at window heads to fastener spacing at every course.
Questions to Ask Before You Choose a Wood-Based Siding
- Will every field-cut edge be sealed with manufacturer-approved sealer before it's installed, not after?
- What's the recommended caulk and coating inspection interval, and who's responsible for it after installation — you or the contractor?
- What voids the warranty, and is that spelled out in writing before the contract is signed?
- How does the product perform specifically in coastal, high-rainfall climates — not just the manufacturer's general climate rating?
- What's the plan for grade clearance, deck ledger transitions, and roof-to-wall flashing, the three spots where wood-based siding fails most often?
Our Honest Bottom Line
LP SmartSide is a legitimate product that has improved a lot over the decades, and it isn't a scam or a bad-faith sale when another contractor installs it. But given what Bellingham's marine climate does to wood-based products over 15-20 years — the salt air, the driving rain, the long moss season — we decided we'd rather install one material we trust completely than several we'd have to caveat. That's why every job we take on goes out in James Hardie fiber cement.
If you're weighing your siding options for a Bellingham or greater Whatcom County home, we're happy to walk through what we install, why, and what it would look like on your house. Reach out for a free, no-pressure estimate — no obligation, just a straight conversation about your exterior.