James Hardie vs LP SmartSide: Which Engineered Siding Wins?

Neither product "wins" outright — James Hardie fiber cement and LP SmartSide engineered wood are both excellent alternatives to traditional vinyl or natural wood siding, but they differ in material composition, installed cost, weight, and long-term maintenance. Your best choice depends on your climate, budget, and how long you plan to stay in the home. This guide breaks down every factor that matters so you can decide with confidence.

What Are These Two Products, Exactly?

James Hardie (often called HardiePlank when referring to its lap siding) is a fiber cement product — a blend of Portland cement, sand, cellulose fibers, and water that is pressed and cured into rigid planks, shingles, or panels. It behaves more like masonry than wood.

LP SmartSide is an engineered wood product made from wood strands bonded with a zinc borate–infused resin and coated with a proprietary overlay called SmartGuard. Think of it as an advanced version of OSB (oriented strand board) that has been treated and sealed specifically for exterior use.

Both are designed to look like real wood siding, resist rot and insects better than natural wood, and hold paint far longer than bare lumber. But because one is cement-based and the other is wood-based, their strengths and weaknesses diverge in important ways.

How Much Does Each Siding Cost Installed?

Material cost is only part of the equation. Fiber cement is heavier, harder to cut, and typically takes longer to install, which raises labor charges. Here is an approximate breakdown for standard lap siding profiles:

These ranges reflect pricing across most U.S. markets as of 2024 and include removal of one layer of existing siding, basic trim work, and painting or prefinishing. Prices vary by region, installer experience, and the specific product line you choose (e.g., Hardie's prefinished ColorPlus line costs more than primed-only boards).

Bottom line on cost: LP SmartSide typically runs 15–25% less than James Hardie for a comparable installation. If budget is a primary concern, LP SmartSide delivers strong performance at a lower price point.

Which Siding Is More Durable?

Moisture and Rot Resistance

Fiber cement is essentially inorganic — cement and sand don't rot. James Hardie siding can absorb some moisture, but it won't decay the way organic materials can. This makes it a strong performer in humid, rainy, or coastal climates.

LP SmartSide's wood strands are treated with zinc borate throughout the panel, not just on the surface. Zinc borate is a well-established fungicide and termiticide. When the SmartGuard overlay remains intact, moisture performance is excellent. However, if the overlay is compromised — by a deep scratch, an improper cut that isn't sealed, or poor flashing — moisture can reach the wood substrate, and engineered wood is more vulnerable to swelling or decay than cement.

Impact Resistance

This is where LP SmartSide has a clear edge. Engineered wood has natural flex. It can absorb impacts from hail, ladders, baseballs, and wind-blown debris without cracking. James Hardie is rigid and brittle by comparison; a hard impact can chip or crack a plank. In hail-prone areas of the Midwest and Great Plains, some homeowners and insurers prefer engineered wood for this reason.

Fire Resistance

James Hardie is noncombustible and carries a Class A fire rating (the highest). LP SmartSide carries a Class A flame-spread rating as well, but because it contains wood, it can eventually ignite under sustained fire exposure. In wildfire-prone regions (parts of California, Colorado, Oregon), some local building codes require noncombustible cladding, which effectively mandates fiber cement or metal over any wood-based product.

Insect Resistance

Termites and carpenter ants have zero interest in cement. James Hardie is completely immune. LP SmartSide's zinc borate treatment provides strong deterrence, and LP has data showing the product resists termite damage effectively. Still, no wood-based product can match the absolute immunity of a cite-free mineral product.

How Do the Warranties Compare?

Warranties are one of the most talked-about differentiators between these two products.

LP SmartSide's 50-year substrate warranty is the longer number on paper, but read the fine print: after the first five years, coverage is prorated, meaning LP pays a declining percentage of replacement costs. James Hardie's 30-year non-prorated warranty covers the full replacement cost of defective material for the entire term, which many homeowners find more valuable in practice.

Key takeaway: Don't compare just the headline number. Read each warranty document — both are available as PDFs on the manufacturers' websites — and pay attention to prorating schedules, exclusions, and installation requirements.

Which Looks Better and Offers More Style Options?

Both manufacturers offer lap siding, vertical board-and-batten, shingle/shake panels, and trim boards. In terms of sheer variety of textures and profiles, they are roughly equal.

• James Hardie's ColorPlus Technology applies a factory-baked finish in more than 700 colors matched to regional palettes (Hardie organizes options by climate zone). The factory finish is notably smooth and consistent.
• LP SmartSide's prefinished options have expanded in recent years, with a deep cedar-grain texture that many homeowners say looks more like real wood than fiber cement does. Field painting is also straightforward because the surface accepts latex paint readily.

Aesthetics are subjective. If you want a pronounced wood-grain texture, LP SmartSide often wins the visual test. If you prefer a cleaner, smoother plank look, James Hardie's smooth-face option may appeal more. Ask your contractor for physical samples of both — photos online don't capture texture well.

What About Weight and Installation?

A standard 12-foot HardiePlank lap board (8.25" exposure) weighs roughly 2.3 pounds per square foot. An equivalent LP SmartSide lap board weighs about 1.1–1.4 pounds per square foot — nearly half as much.

Why does weight matter to you as a homeowner?

• Labor cost: Heavier material is slower to handle, requires more workers, and demands specialized cutting tools (fiber cement dust is a silica hazard, so installers need dust-capture saws). This is a significant reason Hardie installations cost more.
• Structural load: On older homes with lighter framing, a contractor may need to verify that walls and fasteners can support the added weight of fiber cement. This is rarely an issue with LP SmartSide.
• DIY-friendliness: Neither product is ideal for a true DIY project — both manufacturers' warranties hinge on proper installation — but LP SmartSide is easier to cut and handle if a skilled homeowner is assisting the crew.

How Does Climate Affect the Decision?

Climate is arguably the single most important variable when choosing between these two.

James Hardie actually manufactures two formulations — HZ5 for general climates and HZ10 for high-moisture and coastal areas. Make sure your contractor specifies the correct zone product for your region.

Maintenance: What Will You Need to Do Over the Years?

Both products require less maintenance than natural wood, but neither is truly zero-maintenance.

• James Hardie (prefinished): Expect to repaint every 15–20 years. Annual maintenance is limited to washing with a garden hose. Caulk joints should be inspected every few years and refreshed as needed.
• James Hardie (field-painted): Repaint every 7–12 years, depending on sun exposure and paint quality.
• LP SmartSide (prefinished): Similar 15-year repaint cycle. The key maintenance task is ensuring that any exposed cuts or scratches are sealed promptly with a quality primer to protect the wood substrate.
• LP SmartSide (field-painted): Repaint every 7–10 years. Be vigilant about sealing any damage to the overlay.

In practical terms, LP SmartSide demands a bit more attention to surface integrity. A fiber cement board with a scratch is still cement underneath. An engineered wood board with a deep gouge has exposed wood fibers that need sealing before moisture finds them.

Resale Value: Which Adds More to Your Home?

According to Remodeling Magazine's 2023 Cost vs. Value report, fiber cement siding replacement recoups approximately 88% of its cost at resale nationally, making it one of the highest-ROI exterior projects. Engineered wood siding isn't broken out as a separate category in that report, but it generally falls between vinyl (roughly 68% recoupment) and fiber cement in appraisers' eyes.

In markets where fiber cement is the dominant premium siding (much of the Southeast and Mid-Atlantic), James Hardie can be a clear selling point. In markets where LP SmartSide has strong builder adoption (parts of the Midwest and Mountain West), the brand recognition gap is smaller.

So Which Should You Choose?

Here is a simplified decision framework:

• Choose James Hardie if: You live in a humid, coastal, or wildfire-prone area; you want maximum rot and fire resistance; you plan to stay long-term and want the strongest resale story; you're comfortable with a higher upfront investment.
• Choose LP SmartSide if: Budget matters but you still want a step above vinyl; you live in a hail-prone or freeze-thaw climate; you value a natural wood-grain appearance; your home's framing is older or lighter and weight is a concern.

Both are legitimate, well-tested products backed by large manufacturers. The "wrong" choice here would be ignoring climate factors or hiring an installer unfamiliar with the product. Proper installation — correct flashing, fastener placement, gap spacing, and back-priming (for Hardie) — matters more than the label on the box.

If you're ready to get pricing for your specific home, get matched with a local contractor using the form on our home page. We connect you with pre-screened installers experienced with both James Hardie and LP SmartSide so you can compare real bids, not just spec sheets.