St. Petersburg Siding Homeowners doing their research often come across Allura fiber cement and ask why we don't offer it as an option. It's a fair question, and it deserves a straight answer. Allura is a real fiber cement product, not a knockoff, and in general terms it competes in the same category as James Hardie: a cement, sand, and cellulose fiber composite that outperforms wood and vinyl in most respects. We're not going to pretend otherwise. But after years of installing siding on homes across St. Petersburg and Pinellas County, we made the call to standardize on one manufacturer, and that manufacturer is James Hardie. Here's the reasoning, product by product.
What Allura Gets Right
Allura fiber cement shares the core chemistry that makes this category of siding worthwhile in Florida: it's non-combustible, it resists termites and rot the way wood-based products can't, and it holds paint and factory finishes far better than vinyl over the long haul. It's manufactured to recognized ASTM standards and sold through a network of building supply dealers, including some here in the Tampa Bay area. For a contractor or homeowner comparing it only against vinyl or wood, Allura is a legitimate upgrade.
So the decision to pass on it isn't about the material science. It comes down to manufacturing consistency, climate-specific engineering, warranty structure, and the depth of support behind the product once it's on a wall exposed to a Gulf Coast summer.
Why We Don't Install It
Climate-Zone Engineering
James Hardie builds region-specific formulations — its HZ5 product line is engineered for the moisture, humidity, and freeze-thaw conditions of a given climate zone, and Florida installations use the HZ5 formulation specifically suited to hot, humid, storm-exposed regions. Allura sells a national product line without that same tier of regional engineering. In a market like St. Petersburg, where wind-driven rain off Tampa Bay and near-constant humidity put real stress on any wall assembly, we'd rather install a board that was formulated with our climate in mind rather than a generic version.
Factory Finish and UV Exposure
Pinellas County gets some of the most intense, sustained UV exposure in the continental United States. Whatever finish goes on your siding will spend decades taking a direct hit from that sun. James Hardie's ColorPlus finish is a baked-on, multi-coat factory process backed by its own dedicated finish warranty, separate from the substrate warranty. Allura's factory finish options exist, but the warranty backing and track record behind that finish system aren't as deep or as long-tested. When a finish starts to chalk or fade unevenly under Florida sun, the difference between a well-documented factory process and a newer one becomes very visible, very fast.
Warranty Structure
This is one of the biggest practical differences. James Hardie's warranty is transferable to a new owner if the home sells within the coverage period — a real selling point in a market where houses change hands often. Allura's warranty terms are less generous on transferability and, in our experience reviewing them, come with more exclusions tied to installation specifics. For a homeowner who might sell in 10 or 15 years, that gap in warranty language matters.
Installer Network and Technical Support
James Hardie invests heavily in contractor training, installation specifications, and technical backup — flashing details, fastener schedules, gap and clearance requirements, all of it is documented and supported with manufacturer field reps we can actually call. Allura's support infrastructure is thinner in this region. Fiber cement is only as good as its installation; the material doesn't fail from poor workmanship, but the assembly around it does — caulk joints open, flashing gets missed, moisture finds a way behind the board. We'd rather work with a manufacturer that backs us up on the details that determine whether a job lasts 30 years or 12.
Track Record in This Climate
James Hardie has been installed on Gulf Coast and hurricane-belt homes for decades, which means there's a long, visible track record of how it performs after real storm seasons, real salt air, and real UV cycling — not lab testing, actual houses. Allura is a newer entrant with less of that long-term local history to point to. We're not saying it will fail; we're saying we don't yet have the same weight of evidence, and on a home that's supposed to last a generation, we'd rather bet on the product with the longer proven record in exactly these conditions.
Side-by-Side Summary
| Factor | James Hardie | Allura |
|---|---|---|
| Climate-zone formulation | Region-specific (HZ5 for Florida) | National formulation |
| Factory finish warranty | Dedicated ColorPlus finish warranty | Factory finish available, less documented backing |
| Warranty transferability | Transferable to new owner | More limited transfer terms |
| Local Gulf Coast track record | Decades of documented history | Shorter regional history |
| Contractor technical support | Extensive installer program | Thinner regional support |
What We Install Instead
We standardized on James Hardie because it lets us give every customer the same answer, every time: a non-combustible siding system, climate-engineered for Florida, with a factory finish and a warranty structure that hold up to scrutiny, backed by a manufacturer that supports the installers putting it on the wall. That consistency matters when your home is dealing with hurricane-force wind gusts, wind-driven rain, and salt air pulled in off the water, year after year.
If you're weighing siding options for a home in St. Petersburg or anywhere else in Pinellas County, we're happy to walk through the reasoning in person and show you the Hardie product lines that fit your house. Reach out for a free, no-pressure estimate — there's no obligation, just a straight conversation about what will actually hold up here.