Exterior project tool
James Hardie® vs LP® SmartSide®: Side-by-Side Comparison
Compare the two most-requested siding brands across the factors that actually matter.
| Factor | James Hardie® (Fiber Cement) | LP® SmartSide® (Engineered Wood) |
|---|---|---|
| Material | Fiber cement — cement, sand, and cellulose fiber. Mineral-based and non-combustible. | Engineered wood — wood strands bonded with resins and treated (zinc borate) against rot and termites. |
| Weight & handling | Heavier and more brittle; needs careful cutting (dust control) and more labor to hang. | Lighter and more forgiving to cut and fasten, which can speed installation. |
| Look | Crisp, low-relief wood-grain or smooth; broad ColorPlus® factory palette. | Deeper, more pronounced wood grain that reads closer to real wood; pre-finished or primed for field paint. |
| Fire resistance | Non-combustible (mineral-based) — an advantage in wildland-urban interface areas. | Combustible wood product; meets code but is not non-combustible. |
| Moisture & Idaho freeze-thaw | Very stable; resists swelling. Cut edges and fastening still must follow spec. | Treated to resist moisture and rot; cut edges must be sealed and details followed to keep the warranty valid. |
| Maintenance | Wash-and-inspect; repaint cycle on field-painted, long on ColorPlus®. | Wash-and-inspect; repaint cycle similar to other painted wood products. |
| Warranty type | Long manufacturer product/finish warranty (see Hardie's published terms). | Long manufacturer substrate/finish warranty (see LP's published terms). |
| Best for | Maximum durability, fire resistance, and resale; willing to invest more upfront. | A warmer, deeper wood look and easier handling, often at a lower material cost. |
Iron Crest Exteriors is an independent installer of both products and installs each to its manufacturer's published specifications. We're not a certified or affiliated dealer of either brand — we'll give you a straight read on which fits your home and budget.
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