Most homeowners come to us already sold on James Hardie fiber cement — they've seen enough Florida siding fail to know they don't want vinyl, LP SmartSide, or anything with wood fiber in it near a Gulf-facing wall. What they usually haven't thought through yet is that "Hardie siding" isn't one product. HardiePlank lap siding and HardiePanel vertical siding are built differently, fastened differently, and finish out differently, and picking the wrong one for a given wall or a given part of a Dunedin house is a mistake that shows up as soon as the sun hits it wrong. We install James Hardie fiber cement exclusively — no vinyl, no engineered wood, no exceptions — and on almost every job in Dunedin the real design conversation isn't Hardie-versus-something-else. It's plank-versus-panel, and where each one actually belongs.
This page is about that decision: what HardiePlank and HardiePanel are each built for, how trim ties them together, how the finish system holds up along St. Joseph Sound and inland toward Curlew Creek, and what our crews do differently on a coastal Pinellas County wall than they would on a house fifty miles from salt water.
HardiePlank is horizontal lap siding — overlapping boards installed in courses, each one shadowing the one below it. It's the siding most people picture when they think "house," and it's the right call for the large majority of Dunedin's housing stock: the Craftsman bungalows and Florida cottages around downtown and the historic district, the ranch homes further inland, and the raised coastal builds near the causeway that want a traditional look without looking like a beach box.
Plank comes in a few reveal widths, most commonly around 5 to 7 inches of exposed face per course, and the reveal you pick changes the whole read of the house. A narrower reveal reads more traditional and detailed — closer to the clapboard look on the older homes near Dunedin's historic core. A wider reveal reads cleaner and more modern, which tends to suit the newer builds and remodels closer to the water. Either way, the horizontal lines do a lot of quiet work: they visually widen a narrow lot, and on the smaller footprints common in Dunedin's older platted neighborhoods, that matters more than people expect walking in.
Plank also comes in smooth and cedarmill (wood-grain) textures. Cedarmill reads more traditional and hides minor surface imperfections better in raking light; smooth reads more contemporary and shows a crisper shadow line at each course. Neither is more durable than the other — the choice is purely aesthetic.
HardiePanel is a large-format vertical sheet product, installed with the joints covered by battens or left as a shiplap-style reveal depending on the look. It's not a substitute for plank on a whole house — it's a different tool, and it earns its place in specific spots: gable ends, dormers, a garage or accessory structure, a rear addition, or as a full-elevation choice on the more contemporary coastal builds going up along and near the water in Dunedin. Vertical lines draw the eye up, which is why panel shows up so often on taller gables and two-story front elevations where a designer wants height emphasized rather than width.
The most common panel application we install in this area is board-and-batten: HardiePanel as the field with vertical HardieTrim battens covering the seams at a regular spacing. It's a strong look on Florida coastal and craftsman-transitional homes alike, and it plays well as an accent against a body of HardiePlank — batten gable over lap siding walls is one of the most requested combinations we build in Pinellas County right now. Panel without battens, left as a smooth or reveal-joint elevation, reads more modern and shows up more on newer construction than on the historic bungalow stock.
One thing worth knowing before you fall in love with a photo: panel is far less forgiving of a bad substrate or sloppy layout than plank is. Every seam and batten line is visible and permanent, so the layout has to be planned before the first sheet goes up, not adjusted as the crew works down a wall the way lap coursing sometimes allows.
Siding gets the attention, but trim is what makes a Hardie installation look intentional instead of just functional. HardieTrim boards finish out corners, window and door casings, frieze boards under the roofline, and the batten strips on a board-and-batten panel wall. We use James Hardie trim exclusively alongside James Hardie siding — never a mismatched composite or wood trim system — because the expansion behavior, fastening requirements, and finish need to match across the whole assembly for the joints to stay tight over time.
Corners on a lap siding job are typically built one of two ways: mitered corners, which give a clean, seamless look but demand tight, weather-sealed joinery to avoid water intrusion at the miter; or corner boards, where a flat trim board covers the plank ends at each corner, which is more forgiving to install correctly and is the more common choice on Dunedin remodels where matching an existing trim profile matters. Window and door casing width and reveal also get decided at this stage — wider casing reads more substantial and traditional, narrower casing reads cleaner and more contemporary, and it should match the overall reveal and texture decisions made for the siding itself rather than being an afterthought.
Both HardiePlank and HardiePanel are available with ColorPlus Technology, a factory-applied, baked-on finish, or as primed boards meant for field painting after installation. In a climate like Dunedin's — salt air off the Gulf, long humid stretches, intense UV, and a summer rain pattern that keeps siding wet more than dry for months at a stretch — the gap between a factory-cured finish and a jobsite paint job is bigger than it would be somewhere drier and cooler. ColorPlus goes on under controlled factory conditions with multiple baked coats, and it comes with its own finish warranty separate from the substrate warranty on the board.
Primed boards still have their place — matching a very specific existing trim color, or a homeowner who wants full control over the topcoat brand and sheen — but for most Dunedin jobs, especially anything within a few blocks of the water, we steer clients toward ColorPlus. Field-applied paint depends on getting a full, even, properly cured coat on every cut edge and joint under real jobsite conditions, and Florida's humidity doesn't always give a painter that window.
| Factor | HardiePlank (Lap) | HardiePanel (Vertical) |
|---|---|---|
| Typical use | Full-house siding, traditional and cottage styles | Gables, accents, garages, full elevations on modern coastal builds |
| Visual line | Horizontal, widens a facade | Vertical, adds height and drama |
| Joint treatment | Overlapping courses, no visible seams | Batten strips or reveal joints, seams are part of the design |
| Layout forgiveness | More forgiving; coursing adjusts down a wall | Less forgiving; layout must be planned before install |
| Common Dunedin pairing | Body of the house | Gable ends or accent walls over a plank body |
Dunedin sits right on the Gulf side of Pinellas County, with St. Joseph Sound, the causeway, and Honeymoon Island all putting salt-laden air onto homes even a few miles inland. James Hardie makes its fiber cement in different formulations for different climate zones, and for this part of Florida that means the HZ10 product line, engineered for hot, humid, high-moisture conditions and built to resist the moisture cycling that causes rot, swelling, and paint failure in less durable materials — the same failures we regularly see homeowners dealing with on old wood and engineered-wood siding around Dunedin.
The climate distinction that matters most for the install itself is coastal versus inland exposure. A house facing the water off Edgewater Drive or near the causeway needs tighter fastener spacing, corrosion-resistant fastener selection, and more conservative clearances at grade than a similar house tucked into an inland neighborhood near the Pinellas Trail. Both still get James Hardie siding and the same care, but the detailing shifts based on how much salt spray and wind-driven rain that particular wall is actually going to see over its life. Hurricane season, June through November, also shapes how we sequence a job — we don't leave a wall partially clad and unprotected heading into an active tropical forecast, and we plan install timelines around the season rather than around it.
Fiber cement performs the way it's supposed to only when it's installed to spec. That's true everywhere, but it's less forgiving in a climate that gives a poorly installed wall every excuse to fail early. Before a Dunedin job is called finished, we confirm:
These aren't optional upgrades — they're the difference between a Hardie installation that holds up on the Gulf coast for decades and one that starts showing problems at the joints within a few years.
If you're weighing plank against panel, working out a board-and-batten gable over a lap-sided body, or just want a straight answer on what belongs where on your Dunedin home, we're happy to walk the property with you. Reach out for a free, no-pressure estimate — the form below gets you started.
Most single-family homes take one to three weeks depending on square footage, trim complexity, and whether panel accents or full corner rebuilds are involved. Weather is the biggest variable during Florida's rainy season, and we build a realistic buffer into the schedule rather than rushing a wall closed in bad conditions.
Confirm they hold an active Florida contractor license, carry liability insurance and workers' comp, and can show you real local references, not just photos. Also ask directly what brand of siding they install and why — a contractor who installs several different products often hasn't specialized deeply enough in any one system's fastening and flashing requirements.
No — we install James Hardie fiber cement exclusively, including HardiePlank and HardiePanel. We made that call because of how vinyl and engineered wood perform against Florida humidity, salt exposure, and pest pressure over time, and we'd rather specialize in one system we trust completely than install several we don't.
James Hardie manufactures fiber cement in different formulations tuned to regional climate demands — HZ5 for colder northern climates and HZ10 for hot, humid, high-moisture regions. Dunedin and the rest of the Gulf coast fall under HZ10, which is engineered for the moisture cycling and humidity this area sees year-round.
Yes — homes with direct water or salt-spray exposure typically need tighter fastener spacing, corrosion-resistant fasteners, and more conservative clearances at grade and roof lines than a similar home a few miles inland. The siding product is the same, but the detailing is adjusted to the specific exposure that wall will see.