Clearwater Siding Homeowners in Pinellas County ask us about LP SmartSide often enough that we think it deserves a straight answer instead of a sales pitch. It's a legitimate product, made by a legitimate manufacturer, and plenty of contractors install it well. We just don't. This page explains what LP SmartSide actually is, what it does right, and why the combination of Clearwater's climate and our own installation standards led us to build our business around James Hardie fiber cement instead.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product. The core is strand-based, similar in concept to OSB (oriented strand board), made from wood strands bonded with resins under heat and pressure. LP treats it with a proprietary process called SmartGuard, which includes zinc borate to resist fungal decay and termites, and the panels or lap boards are finished with a treated overlay before a topcoat is applied. It comes in lap siding, panels, and trim, and it's a step up from the untreated OSB and hardboard sidings that gave "wood composite" a bad name in the 1990s.
To LP's credit, the SmartGuard treatment genuinely improved on those older products. It's lighter than fiber cement, easier to cut and nail without specialized blades, and it's typically less expensive up front. For a contractor working in a dry, moderate climate with a homeowner who will stay on top of maintenance, it can be a reasonable choice.
The Core Issue: It's Still Wood
Underneath the treatment and the topcoat, LP SmartSide is still a wood-based product, and wood-based products share one fundamental vulnerability: they respond to sustained moisture. Zinc borate treatment resists rot and insects, but it doesn't make the substrate waterproof. The long-term performance of engineered wood siding depends almost entirely on keeping water out of the panel — at every seam, every fastener, every cut edge, and every point of contact with trim, flashing, or the ground.
That's a demanding standard to hold for the life of a house, and it's a much harder standard to hold in Clearwater than it is in, say, Denver.
Why Our Climate Raises the Stakes
Pinellas County sits on a peninsula, which means every house here deals with a combination of stresses that inland markets don't see nearly as often:
- Wind-driven rain. Tropical systems and summer storms don't just drop rain — they push it sideways into siding at high velocity, forcing water into any gap, unsealed cut edge, or failed caulk joint.
- Hurricane-force wind loads. Repeated flexing and pressure cycling during storm season stresses fasteners and seams over years, and any point that starts to open becomes a moisture entry path.
- Intense, near-constant UV exposure. Florida sun is harder on painted surfaces than most of the country experiences, which shortens the service life of factory and field-applied coatings alike.
- Salt air. Even well inland from the Gulf, airborne salt accelerates the breakdown of caulking, sealants, and paint films, all of which are the only thing standing between engineered wood and moisture intrusion.
None of these factors are exotic or theoretical — they're just the normal weather pattern for a coastal Central Florida county. But stacked together, they shorten the margin for error on any product whose long-term performance depends on an intact protective coating.
Where the Failure Points Actually Are
When engineered wood siding underperforms, it's rarely because the panel itself failed on day one. It's almost always a maintenance and detailing problem that compounds over years:
Cut Edges and Field Fabrication
Every LP SmartSide installation involves field cuts — around windows, doors, corners, and utility penetrations. Manufacturers require those cut edges to be sealed with an approved primer or sealant before installation. If a crew skips that step, rushes it, or misses a spot, that exposed edge becomes the fastest path for water into the strand core. It's an easy step to shortcut and a hard one to inspect after the fact.
Caulk and Paint as Load-Bearing Protection
With engineered wood, the caulk joints and paint film aren't cosmetic — they're doing structural work in keeping the substrate dry. That means the homeowner effectively inherits a recurring maintenance obligation: inspecting and recaulking joints, repainting on a cycle, and catching failures before they let water sit against the core. Skip a maintenance cycle in a mild climate and you might get away with it. Skip one in a Gulf Coast wind-and-salt environment and the clock runs faster.
Ground Contact and Drainage Details
Like any wood-based siding, LP SmartSide needs proper clearance from grade, roof lines, decks, and irrigation spray. In a state where sprinkler systems, humidity, and heavy rain are constant, those clearance and flashing details matter more than the marketing literature suggests.
LP SmartSide vs. James Hardie Fiber Cement
| Factor | LP SmartSide (engineered wood) | James Hardie (fiber cement) |
|---|---|---|
| Core material | Wood strand composite with resin binder | Cement, sand, and cellulose fiber — non-combustible |
| Moisture behavior | Resists decay when sealed and maintained; vulnerable at unsealed edges/seams | Does not rot, swell, or delaminate from moisture exposure |
| Factory finish | Primed or coated; typically needs repainting within roughly 7-10 years in harsh sun | ColorPlus factory-baked finish engineered for long-term color retention |
| Fire rating | Combustible (wood-based) | Non-combustible |
| Coastal/UV performance | Manufacturer-rated for use, but performance leans heavily on maintenance discipline | HZ product lines engineered specifically for high-humidity, coastal climate zones |
| Ongoing maintenance | Periodic caulk inspection and repainting required to protect the substrate | Minimal — mainly periodic washing and caulk checks, no repaint cycle to protect the core |
| Typical warranty structure | Manufacturer warranty on product, contingent on maintenance and correct installation per LP's requirements | Strong transferable manufacturer warranty backing both the substrate and the ColorPlus finish |
| Upfront material cost | Generally lower | Generally higher |
Neither column is a scam and neither is universally "better" in the abstract. The comparison is about which trade-offs make sense for a specific climate and a specific homeowner's tolerance for ongoing upkeep. In Pinellas County, we've made our call.
Why We Standardized on James Hardie Instead
We install exclusively James Hardie fiber cement siding, and we did that deliberately rather than defaulting to it. A few reasons drove that decision:
- Non-combustible core. Fiber cement doesn't burn, which matters on its own merits independent of climate.
- Moisture doesn't compromise the substrate. There's no strand core to protect from water intrusion — the material itself doesn't rot, swell, or delaminate the way wood-based products can if a seal fails.
- Climate-engineered product lines. Hardie's HZ5 formulation exists specifically for high-humidity, storm-prone regions like ours, rather than a one-size-fits-all national spec.
- ColorPlus factory finish. A baked-on finish applied under controlled conditions holds up to UV and salt air longer than field-applied paint, and it removes the repaint cycle from the homeowner's maintenance list for years at a stretch.
- Warranty strength. Hardie backs both the substrate and the ColorPlus finish with a transferable warranty, which also helps at resale.
Installed to spec — correct fastening, clearances, flashing, and joint treatment — Hardie holds up to the specific combination of wind, rain, UV, and salt air that Clearwater homes deal with every year, with a lower ongoing maintenance burden than an engineered wood system.
A Maintenance Checklist for Homeowners Who Already Have Engineered Wood Siding
If your home already has LP SmartSide or a similar engineered wood product, that's not an emergency — it just means staying ahead of the maintenance items that protect it:
- Inspect caulk joints at seams, trim, and penetrations at least once a year, and recaulk anywhere it's cracked, shrunk, or pulled away.
- Watch for soft spots, swelling, or dark staining near the bottom courses, corners, and anywhere siding meets a roofline, deck, or downspout.
- Keep sprinkler heads and drip irrigation from spraying directly onto siding.
- Maintain clearance between siding and grade, mulch beds, and other landscaping that traps moisture against the wall.
- Repaint on the cycle recommended by the manufacturer or sooner if the finish is chalking, fading, or peeling — the paint film is doing real protective work, not just cosmetic work.
- Have a contractor check fastener condition and panel edges after major storms, since wind-driven rain finds gaps that dry-weather inspections miss.
What This Means If You're Planning a Siding Project
We're not going to tell you LP SmartSide is a bad product across the board — it isn't. We're telling you it asks more of the climate and the maintenance schedule than we're comfortable standing behind on a coastal Pinellas County home, and that after weighing the trade-offs, fiber cement is what we choose to put our name on. If you're comparing siding materials for a Clearwater project, we're glad to walk through the specifics of your home, your budget, and how James Hardie's product lines would apply to it.
If you'd like a straight, no-pressure look at your options, request a free estimate using the form below and we'll walk the property with you.