The 30-Second Verdict
James Hardie HardiePlank (fiber cement) is the premium choice for Florida — particularly coastal and hurricane-zone homes. It's inorganic at its core (no wood fiber at the surface), resists moisture and salt air excellently, and carries Miami-Dade NOA approval. LP SmartSide (engineered wood) is 15–25% less expensive and performs well inland but is less ideal for coastal Florida or areas with extreme humidity. For Florida, James Hardie is worth the premium in most cases.
Head-to-Head Breakdown
James Hardie HardiePlank
Pros
- Fiber cement — inorganic core, no wood rot risk
- HZ5 product line specifically for humid/coastal climates
- Miami-Dade NOA approval for HVHZ
- 30-year warranty
- Factory-primed or ColorPlus pre-finished options
Cons
- More expensive than LP SmartSide
- Heavier — requires more care in installation
- Less forgiving of improper flashing
LP SmartSide
Pros
- 15–25% less expensive than James Hardie
- Lighter and easier to install
- Treated engineered wood — good rot/insect resistance
- 25-year limited warranty
Cons
- Contains wood fiber — more susceptible to moisture than fiber cement
- Less ideal for coastal FL (within 1 mile of salt water)
- No HVHZ approval in Miami-Dade zone
- May require more painting maintenance than HardiePlank
Side-by-Side Comparison
| James Hardie HardiePlank | LP SmartSide | |
|---|---|---|
| Material | Fiber cement (no wood at core) | Engineered wood with treatment |
| Miami-Dade NOA (HVHZ) | Yes | No |
| Coastal FL Suitability | Excellent | Moderate (inland preferred) |
| Installed Cost (FL) | $8–$14/sq ft | $6–$12/sq ft |
| Warranty | 30 years | 25 years |
| Paint Required | Every 15 years (ColorPlus pre-finished) | Every 10 years |
| Best FL Application | Coastal, HVHZ, premium homes | Inland Florida, cost-conscious projects |
Frequently Asked Questions
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