James Hardie vs. LP SmartSide: Which Siding Wins in the Pacific Northwest?

When a homeowner in Bellevue or Mill Creek calls us about new siding, the first question is almost always the same: James Hardie or LP SmartSide? They're the two products we install most, and both are excellent. The right answer depends on your home, your budget, and what you want the finished exterior to feel like.

James Hardie: fiber cement built for rain

James Hardie is fiber-cement siding — a blend of cement, sand, and cellulose fiber. It does not rot, it won't feed insects, and it shrugs off the constant moisture that defines life around Puget Sound. For waterfront and tree-shaded homes in places like Mercer Island, Edmonds, and Mukilteo, that resistance to swelling and decay is exactly why we recommend it so often.

• Non-combustible and highly fire-resistant
• Factory ColorPlus finishes that hold up for years against UV and rain
• Extremely dimensionally stable — it doesn't move much with humidity swings
• Heavier and more labor-intensive to install, which is reflected in cost

LP SmartSide: engineered wood that installs lighter

LP SmartSide is engineered wood — wood strands bonded with resins and treated with a zinc borate compound that resists fungal decay and termites. It's lighter than fiber cement, which can speed up installation and bring the project cost down. Many homeowners also love the deeper, more authentic wood-grain texture, especially on craftsman-style homes in Seattle and Kirkland.

• Lighter weight and faster to install
• Warm, realistic wood-grain appearance
• Comes in long lengths, meaning fewer seams on big walls
• Generally more budget-friendly than fiber cement

So which one should you choose?

When comparing James Hardie and LP SmartSide, consider the exact product's moisture-management requirements, fire classification, finish, appearance, and installed cost. Both require proper flashing, a suitable water-resistive barrier, and ongoing maintenance. Service life depends on the product, installation, exposure, and upkeep; it should not be promised from the material name alone.