What is LP SmartSide?
LP SmartSide is engineered wood siding made by Louisiana-Pacific. The product takes dense compressed wood strands, treats them with a zinc borate insect repellent and a moisture-resistant resin, bonds them under heat and pressure into a structural panel, then embosses a wood-grain face and applies a factory primer. The result is a lap-style siding that looks like painted cedar, holds paint longer than wood, weighs less than fiber cement, and resists termite and rot damage. It is the leading competitor to James Hardie fiber cement on premium siding jobs in Virginia and Maryland.
A single LP SmartSide lap siding plank, shown in cyan. The face is embossed with a horizontal wood grain pattern; the cut-away at the right end exposes the compressed engineered wood strand core, the zinc borate insect treatment that saturates every strand, and the factory-primed edges.
Is LP SmartSide just OSB?
This is the most common question online, and the answer is no. Both LP SmartSide and oriented strand board (OSB) use compressed wood strands as the base, but the manufacturing process is different in three important ways. SmartSide strands are smaller and more uniform, the resin binder is moisture-cured (not the urea-formaldehyde used in OSB), and every strand is saturated with a zinc borate insect treatment that runs all the way through the material (not just a surface coat). The finished product is denser, more dimensionally stable, and far more weather-resistant than commodity OSB.
Calling SmartSide “just OSB” is roughly like calling architectural shingles “just asphalt.” Same base material, very different engineering.
What is the difference between LP SmartSide and James Hardie?
Both are premium siding products and both significantly outperform vinyl. The choice usually comes down to weight, install complexity, and aesthetic preference.
| LP SmartSide (engineered wood) | James Hardie (fiber cement) | |
|---|---|---|
| Base material | Compressed wood strands + zinc borate treatment + resin binder | Portland cement + cellulose fiber + sand + water |
| Weight | About 1.5 lb per square foot | About 2.5 lb per square foot |
| Workability | Cuts with standard wood saw, easy to nail | Requires diamond blade and PPE, special nails |
| Texture | Embossed wood grain on the face | Smooth or rough-sawn cedar look |
| Manufacturer warranty | 5 / 50 year prorated | 30 year non-prorated on product |
| Paint hold | Excellent (factory primer + on-site finish) | Excellent (ColorPlus available) |
| Termite resistance | Yes (zinc borate) | Yes (cement is inert) |
| Moisture damage if cut edge unsealed | Real risk (must seal field cuts) | Low risk (cement is inert) |
| Typical installed cost premium | About 10 to 20 percent over vinyl | About 25 to 40 percent over vinyl |
For lighter wall framing or where install speed matters, SmartSide is often the better choice. For maximum durability and minimum maintenance, Hardie usually wins. Both look excellent installed correctly.
What is the life expectancy of LP SmartSide?
Real-world life expectancy is 30 to 40 years in our Virginia and Maryland climate, assuming the install was done correctly (field cuts sealed, fasteners gun-driven to spec, joints flashed). The manufacturer warranty is structured as 5 years of full coverage and a prorated tail out to 50 years, but warranty math is rarely a meaningful homeowner protection; the install quality determines real life span more than the warranty terms.
The product line has been on residential exteriors since the late 1990s, and field reports from 25 plus year installs are largely positive. The most common failure mode is moisture wicking into an unsealed field cut at a window or door, not bulk product failure.
What are the disadvantages of LP SmartSide?
- Field cut edges must be sealed. Every cut made on site (around windows, doors, transitions) exposes raw engineered wood. Manufacturer spec is to prime and paint every field cut before install. Skipping this is the single most common failure mode.
- Susceptible to moisture if water gets behind it. If the housewrap, flashing, or rain screen is poorly executed, water can sit against the back of the SmartSide and degrade the bond. Fiber cement is more tolerant of this.
- Painted finish is the homeowner’s job over time. Factory primer is excellent but not the final coat; a high-quality acrylic exterior paint is applied on site and recoated at the homeowner’s normal repaint cycle (10 to 15 years in our climate).
- Color selection is via paint, not factory pigment. No equivalent to Hardie’s ColorPlus baked-on color. SmartSide gets painted on site, which adds labor and means the color match depends on the paint crew.
- Termite resistance depends on the zinc borate. If a manufacturing defect skipped the treatment, the product is vulnerable. This is rare but documented.
What DreamHome installs
DreamHome installs LP SmartSide as one of two premium siding tiers (alongside James Hardie) on Virginia and Maryland homes. Every install includes field-cut sealing per manufacturer spec, a 3/8-inch rain screen behind the panel, color-matched J-channel around windows and doors, and a high-quality exterior acrylic finish coat applied on site. The 5 / 50 year manufacturer warranty is registered for every install.
SmartSide pairs especially well with our climate’s mix of cold winter and hot humid summer: the lighter weight is easier on older homes’ framing, the painted finish accepts a fresh recoat at the homeowner’s normal repaint cycle, and the zinc borate treatment handles termite pressure from the surrounding landscape.
Red flags on someone else’s LP SmartSide job
- No field-cut sealing. Cuts at windows, doors, and transitions left raw. Open invitation to moisture wicking. Insist on this in writing.
- No rain screen behind the siding. Direct attachment to housewrap traps moisture against the back face. A 3/8 inch furring strip rain screen lets the wall dry.
- Fasteners over-driven or angle-driven. Each panel must be nailed per spec at the gun depth and angle the manufacturer publishes. Off-spec nails crush the face or fail to engage the framing properly.
- Finish paint not specified. “Painted on site” without a named paint brand and warranty term. Quality acrylic exterior paint (Sherwin Williams, Benjamin Moore equivalent) at minimum.
- Quote prices SmartSide and “engineered wood” without specifying LP. Some installers swap to less reputable engineered wood brands. Always insist on the LP product name on the quote and on the bundle wrappers delivered.