Clearwater Siding Two Different Materials, One Big Decision
When Clearwater homeowners start pricing new siding, two names come up more than any others: James Hardie fiber cement and LP SmartSide engineered wood. Both are legitimate, code-approved siding systems with real track records. But they are built from fundamentally different materials, and in a coastal Pinellas County climate — with hurricane-force winds, intense year-round UV, wind-driven rain, and salt air all working against a home's exterior — that underlying material matters more here than it does in most parts of the country.
This page walks through what each product actually is, how they tend to perform in our specific climate, and why our company made the decision years ago to install only James Hardie fiber cement siding. We are not going to tell you LP SmartSide is a bad product — it is a legitimate engineered wood system with plenty of homes across the country. We are going to tell you why, given what we see in this climate, we do not put it on homes.
What James Hardie Actually Is
James Hardie siding is fiber cement — a blend of Portland cement, sand, and cellulose fibers, cured and formed into planks, panels, and trim. It is not wood, and it does not behave like wood. It does not absorb moisture the way wood-based products do, it does not support combustion, and its factory-applied ColorPlus finish is baked on rather than field-painted. Hardie makes region-specific product lines (their "HZ5" formulation is engineered for humid climates like ours), which tells you the company builds around climate variation rather than selling one formula everywhere.
What LP SmartSide Actually Is
LP SmartSide is an engineered wood product — strand-based substrate made from wood fibers, resins, and zinc borate treatment for insect and fungal resistance, finished with a resin-saturated overlay and factory primer or pre-finish. It is lighter than fiber cement, easier to cut and handle on site, and has genuine fans among builders in drier, more moderate climates. The zinc borate treatment is a real improvement over untreated wood siding of decades past. But at its core, it is still a wood-fiber product, and wood fiber's relationship with sustained moisture is different from cement's.
How Each Material Handles the Clearwater Climate
Pinellas County siding doesn't get an easy ride. Between June and November, homes here face tropical systems and the wind-driven rain that comes with them — rain that doesn't just fall, it gets forced sideways and upward under laps and around trim. Add near-constant UV exposure, salt-laden air moving in off the Gulf, and long stretches of high humidity, and you have a climate that stress-tests every seam, every cut edge, and every finish on a home's exterior.
Fiber cement is dimensionally stable in this kind of environment — it doesn't swell, shrink, or cup with humidity swings the way wood-based products can. Engineered wood products have improved their moisture resistance significantly over the years, but they still rely on an intact factory finish and correctly sealed cut edges to keep water out of the wood-strand substrate. In a climate where wind-driven rain finds every gap, that finish integrity becomes the whole ballgame.
Moisture Behavior: The Core Engineering Difference
Fiber Cement and Water
Cement-based siding can get wet and dry out without the material itself breaking down. It has no wood fiber to absorb water and swell. This doesn't mean installation details stop mattering — flashing, caulking, and drainage planes are still essential on any siding job — but the base material itself isn't the weak link.
Engineered Wood and Water
LP SmartSide's strand-based substrate is treated and coated specifically because wood fiber and moisture don't mix well long-term. As long as the factory finish stays intact and every field cut gets properly primed and sealed, the product performs as designed. The risk in a humid, storm-prone market is cumulative: a nick in the finish, an under-sealed cut edge at a window return, or caulk that fails after a few Florida summers can let moisture reach the substrate before anyone notices. That's a maintenance-dependency we don't want to build into a Clearwater home's exterior.
Fire and Wind Performance
Fiber cement is non-combustible by nature — it contains no wood fiber to burn. Engineered wood products, even with treatments, are still wood-based and combustible, which is reflected in how they're rated and installed relative to fire-separation requirements in some jurisdictions. For wind, both products can be installed to meet Florida's wind-load codes when engineered and fastened correctly, but fiber cement's added mass and rigidity give it a performance margin in sustained high-wind events that a lighter engineered-wood panel doesn't have in the same way.
Finish, Color, and Long-Term Maintenance
James Hardie's ColorPlus finish is baked on at the factory in a controlled environment, with a warranty specifically covering finish performance — resistance to fading and cracking — separate from the substrate warranty. LP SmartSide is typically factory-primed and requires field topcoating (or comes pre-finished depending on the product line), which shifts more of the long-term finish performance onto the quality of that field or factory coat and the homeowner's repainting cycle down the road.
In a market like Clearwater, where UV exposure is intense nearly year-round, finish durability isn't a cosmetic detail — it's a functional one. A finish that chalks, fades, or cracks early exposes the substrate underneath sooner, on any siding product.
Warranty Structure Compared
| Factor | James Hardie | LP SmartSide |
|---|---|---|
| Substrate warranty | Non-prorated, long-term (product-line dependent) | Limited warranty, terms vary by product line |
| Finish warranty | Separate ColorPlus finish warranty on fading/cracking | Finish coverage tied to primer/topcoat system used |
| Transferability | Transferable to a new owner within terms | Varies by product line and dealer |
| What voids coverage | Improper installation, unapproved finishes | Improper installation, finish neglect, unsealed cuts |
Every warranty in this category is only as good as correct installation. But the two products put different demands on that installation to keep the warranty intact — fiber cement's requirements center on flashing, clearances, and fastening; engineered wood's requirements add finish maintenance and cut-edge sealing to that list.
Installation Sensitivity
Both products are "installer-dependent" in the sense that a poor install can undermine even the best material. But the products are sensitive to different mistakes:
- Fiber cement demands correct fastener placement, proper clearances from grade and roof lines, and correctly lapped flashing to manage bulk water.
- Engineered wood adds a requirement that every field cut, notch, and drilled hole gets sealed before it's exposed to weather — skip that step and you've created an entry point into the substrate.
- Both require correct water-resistive barrier and flashing details behind the siding — the siding is one layer of a larger water-management system, not the whole system.
- Caulking and joint maintenance schedules differ between the two, and neglecting them shortens the effective life of either product.
We standardized on one system in part so our crews master one set of installation details rather than switching between two different moisture-management approaches from house to house.
Cost Factors to Weigh
Material and labor pricing shift constantly, so we won't quote numbers here — but the honest framework for comparing bids looks like this:
| Cost Factor | What to Ask |
|---|---|
| Material cost per square | Is the quote for a comparable product line and thickness on both sides? |
| Installed cost vs. material cost | Fiber cement's weight can affect labor time and crew experience needed |
| Finish system included | Factory-finished, or does it require field priming/painting after install? |
| Long-term repainting cycle | Will this product need a repaint in 7-10 years, or is the finish warrantied longer? |
| Warranty value | Non-prorated vs. prorated coverage changes what a warranty is actually worth later |
Why We Standardized on James Hardie
We made a business decision to install only James Hardie fiber cement, and we think Clearwater and greater Pinellas County homeowners deserve to know why rather than just being told "this is what we offer." Given the storms, humidity, salt air, and sun this coastline sees every year, we did not want to build our reputation on a product whose long-term performance leans on field finish quality and diligent cut-edge sealing across every job, every crew, every year. Fiber cement's non-combustible, dimensionally stable nature combined with a factory-cured finish and a strong transferable warranty gave us a system we could stand behind consistently, on every home, without qualifiers.
That doesn't make LP SmartSide a poor product in the abstract — it has its place. It's not the product we choose to put our name behind here.
Questions Worth Asking Before You Decide
- What warranty terms apply to the exact product line being quoted — not just the brand name?
- Is the finish factory-applied, or will it need field priming and painting?
- How is moisture managed at cut edges, penetrations, and trim returns?
- What's the manufacturer's climate-specific product recommendation for coastal Florida?
- Is the installer certified or specifically experienced with the product being quoted?
- What does the warranty require of you as the homeowner to stay valid?
If you're weighing siding options for a Clearwater home, we're happy to walk through what we see in this climate and why we install what we install — no pressure, no obligation. Request a free estimate below and we'll take a look at your home in person.