If you’re researching fiber cement and engineered wood siding, chances are you’ve come across both James Hardie and LP Smart Siding. Both are quality products. Both are a significant step up from standard vinyl. And both are worth understanding before you make a decision on your home.
As a certified James Hardie installer serving St. Louis and Metro East Illinois, IES Construction & Roofing installs Hardie every week. We know LP Smart Siding well too. Here’s an honest side-by-side comparison — no sales pitch, just the facts that matter for a St. Louis homeowner.
What Is James Hardie Siding?
James Hardie is a fiber cement siding product — made from cement, sand, and cellulose fibers. It’s one of the most widely installed siding products in the country and the product IES installs most frequently on St. Louis and Metro East Illinois homes.
What most homeowners don’t know is that the James Hardie product installed on your St. Louis home is not the same product installed on a home in Florida or Arizona. James Hardie engineers their siding by climate zone — a program called HardieZone®. The formulation, fiber content, and performance characteristics of the product are specifically designed for the humidity levels, freeze-thaw cycling, and temperature swings of your region.
For St. Louis and Metro East Illinois — a climate with hot humid summers, hard winters, and significant freeze-thaw cycling — Hardie installs HZ10® product. This matters because a siding product that performs beautifully in a dry southwestern climate may not hold up the same way in ours. James Hardie has done that engineering work so you don’t have to worry about it.
What Is LP Smart Siding?
LP Smart Siding is an engineered wood product — made from wood strands that are treated and compressed with adhesive resins and a zinc borate preservative for moisture and pest resistance. It’s a legitimate product with a strong track record, and it offers one thing James Hardie doesn’t — a genuinely convincing wood grain texture.
If the look of real wood is the priority, LP Smart Siding delivers a wood grain profile that reads naturally and authentically. It’s a good looking product and there are St. Louis homes where it’s the right choice.
The Key Differences
Climate Engineering
This is the most important difference for St. Louis homeowners. James Hardie engineers their product for your specific climate. LP does not. LP Smart Siding is the same product regardless of where it’s installed — St. Louis, Seattle, or Miami. That’s not a knock on LP — it’s simply how the product is manufactured.
For our market, with its combination of summer heat, humidity, and hard winter freeze-thaw cycles, having a product specifically engineered for those conditions is a meaningful advantage.
Expansion and Contraction
Engineered wood expands and contracts with moisture and temperature changes more than fiber cement does. This is a normal characteristic of wood-based products — and it’s something your installer has to account for in the field.
With LP Smart Siding, installation requires larger gaps at joints and penetrations to allow for that movement. Those gaps are then caulked — and over time, as the siding moves and the caulk ages, those joints require more attention and maintenance than a fiber cement installation.
James Hardie fiber cement has significantly less movement. Joints can be tighter, caulk lines are smaller, and the finished installation has a cleaner, tighter appearance right from day one.
Wood Grain Appearance
This is an area where LP has a genuine advantage. LP Smart Siding’s wood grain texture is more natural and convincing than James Hardie’s. If you’re specifically looking for a product that reads as real wood, LP delivers that better than Hardie does. Hardie’s wood grain options are available but they read as a pattern rather than a natural grain — and to most eyes, it’s noticeable up close.
If the wood look is important to your project, this is worth factoring into your decision.
Material Composition
James Hardie is fiber cement — it does not absorb moisture, it will not rot, and it is not susceptible to insect damage. LP Smart Siding is an engineered wood product — treated for moisture and pest resistance, but wood-based at its core. Both products perform well when properly installed and maintained. Fiber cement has a longer track record in high-moisture climates.
Which One Is Right for Your Home?
For most St. Louis and Metro East Illinois homeowners, James Hardie is the stronger long-term specification — the climate engineering, tighter installation tolerances, and fiber cement composition give it an edge in our specific market conditions.
That said, LP Smart Siding is a quality product and there are projects where it makes sense — particularly when the natural wood grain aesthetic is a priority and the homeowner understands the maintenance requirements that come with a wood-based product.
IES Construction & Roofing installs James Hardie. We’re a certified installer — which means our crews are trained to Hardie’s installation standards, and every IES Hardie installation activates the full manufacturer warranty. If you’re weighing both options for your home, we’re happy to walk you through the comparison at your free estimate.