James Hardie vs. LP SmartSide: Which Siding Is Right for a St. Louis Home?

Fiber cement vs. engineered wood: a contractor's honest comparison of the two leading premium siding systems for St. Louis homes.

When St. Louis homeowners upgrade from vinyl siding, the question almost always comes down to two products: James Hardie fiber cement and LP SmartSide engineered wood. Both are excellent. Both are dramatically better than vinyl. But they're different systems with different strengths.

Here's how we help homeowners choose between them.

James Hardie (fiber cement)

Fiber cement is a composite of Portland cement, sand, cellulose fibers, and water. Cured into rigid planks. The result is a siding product that doesn't burn, doesn't rot, doesn't warp, and doesn't attract insects.

Pros

Fire resistance is the most-cited advantage. James Hardie carries a Class A fire rating — it doesn't propagate flame. For homes in fire-conscious neighborhoods or near wildland-urban interfaces, this matters.

Color longevity: Hardie's ColorPlus baked-on finish is warranted for 15 years against fading, chipping, or cracking. Field-painted finishes will fade in 7–10 Missouri summers; Hardie's factory finish is a different category.

Insurance discounts: some carriers offer 5–10% premium discounts for fiber-cement siding due to the fire rating. Worth checking with your insurance agent before deciding.

30-year limited warranty on the substrate.

Cons

Weight: fiber cement is 2.5x heavier than engineered wood. This isn't a problem for installation but matters for older homes with marginal wall framing. We assess this on every Hardie project.

Brittleness: drop a Hardie plank during install and it breaks. Trained crews handle this; less-trained crews waste material. Always check that your installer is certified by James Hardie's Preferred Contractor program.

Higher install cost: typically 15–25% more than LP SmartSide for the same project, primarily due to weight, cutting equipment, and certified-installer labor.

LP SmartSide (engineered wood)

Engineered wood is real wood strands and fibers bonded with exterior-grade resins, treated with a zinc-borate preservative. The result is a wood product that resists rot, fungal decay, and insect damage — without the brittleness of fiber cement.

Pros

Workability: LP cuts, fastens, and handles like wood. Crews work faster, waste less material, and integrate it cleanly with trim, soffit, and fascia details. The aesthetic is closer to true wood siding than fiber cement.

Cost: typically 15–25% less installed than equivalent James Hardie. Real money on a full re-side project.

Weight: lighter than fiber cement, no structural impact on older homes.

5/50 warranty: 5 years on finish, 50 years on substrate against rot, decay, and fungal damage. The 50-year substrate warranty is one of the strongest in the siding industry.

Cons

Lower fire resistance than fiber cement. Not Class A. For most St. Louis homes this doesn't matter, but if fire performance is a priority, Hardie wins.

Finish life: factory pre-finish from LP's ExpertFinish line is good for ~7 years before refresh. Field-painted is similar. Both shorter than Hardie's 15-year ColorPlus warranty.

Substrate is wood-based — if installed wrong (improper flashing, ground clearance, painted edges), it can rot. The treatment helps but doesn't make it indestructible. Installation matters more than with fiber cement.

Where each one wins

Choose James Hardie if: you want maximum fire resistance, you want the longest color life without repainting, your insurance carrier offers a fire-resistance discount, or you have the budget for premium-tier siding.

Choose LP SmartSide if: you want a more wood-like aesthetic, you have a tighter budget but still want premium-tier performance, you have an older home with structural weight concerns, or you want the easier installation and better trim integration.

What we install

Revolve installs both. We're a James Hardie Preferred Contractor and an LP SmartSide certified installer — installation training matters for the warranty validity on both products. We bid both systems on every full re-side project so the homeowner sees the actual cost delta for their specific home, and we walk through the trade-offs in person rather than steering toward whichever product has a higher margin that month.

For the median St. Louis home — single-family, asphalt-shingle roof, vinyl siding being upgraded, no specific fire concern — we recommend LP SmartSide more often. It hits a better cost-performance balance for most homeowners. But for homes where fire performance or longest-possible finish life is the priority, Hardie is the answer.