James Hardie and LP SmartSide are the two siding brands homeowners across Clark County ask about most, and for good reason — both are well-established, warrantied products with a track record in wet climates. They're built on different materials, though, and that difference matters more here than in a drier region.
This is an honest, side-by-side comparison for Southwest Washington's marine climate specifically — not a generic national write-up. Both materials can perform well when installed correctly; where they differ is composition, weight, warranty structure, and how each handles sustained moisture over decades of our winters.
We install both, and we don't have a financial reason to steer a homeowner toward one over the other beyond what actually fits their home and goals. This guide reflects how we actually talk through the decision with clients in Vancouver, Camas, Battle Ground, and the surrounding area — not a manufacturer's marketing framing of either product.
Advantages
- Cement-based composition doesn't absorb moisture the way a wood-based product can.
- Factory ColorPlus finishes carry a separate, long finish warranty on top of the substrate warranty.
- Rated highly in federal building-science comparisons for moisture, fire, and pest resistance.
Trade-offs
- Heavier material — installation typically calls for two installers and specific fastening practices.
- Higher material and labor cost than engineered wood siding.
- Cut edges require sealing to maintain the moisture-resistance rating.
Advantages
- Lighter than fiber cement, which can mean a faster installation on some projects.
- A factory-applied treatment process is engineered specifically to resist decay, termites, and fungal growth.
- A warmer, more traditional wood-grain appearance for homeowners who prefer that look.
Trade-offs
- Wood-strand substrate is inherently more moisture-sensitive than cement if the factory finish or field-cut edges aren't properly sealed.
- Warranty terms are structured differently than Hardie's — worth reading closely for a wet-climate home.
- Generally a shorter track record in the harshest coastal-adjacent marine exposures than fiber cement.
| Factor | James Hardie | LP SmartSide |
|---|---|---|
| Base material | Cement, sand, and cellulose fiber | Engineered wood strand with a protective treatment |
| Moisture approach | Resists absorption by composition | Resists decay via factory treatment process |
| Weight | Heavier — typically a two-installer product | Lighter — often faster to install |
| Finish | Factory ColorPlus prefinish available | Factory prefinish available |
| Look | Smooth or wood-grain textures | Traditional wood-grain texture |
Neither material is the universally correct answer — the right choice depends on your priorities. Homeowners planning to stay in their home long-term, who want the lowest realistic long-term maintenance and the strongest moisture-resistance margin for a full-exposure marine climate, tend to lean toward James Hardie. Homeowners who want a genuine wood-grain aesthetic with strong decay resistance at a somewhat lower installed cost often lean toward LP SmartSide.
Your home's specific exposure matters too. A wall that takes direct, wind-driven rain — common on west- and south-facing elevations in the Gorge corridor — benefits most from fiber cement's moisture-resistant composition. A more sheltered elevation under generous roof overhangs has more flexibility either way. We look at your home's actual exposure, not just a blanket recommendation, before suggesting one material over the other.
Budget plays a role too, but we'd encourage thinking about it across the ownership period rather than just the installed price. A lower material cost upfront can be offset over time by a shorter repaint or maintenance cycle, depending on which product and finish option you choose. We're happy to lay out that longer-view comparison alongside the installed cost when you're deciding between the two.