LP SmartSide vs James Hardie Siding: Michigan Comparison
We get this question at least three times a week: "Should I go with LP SmartSide or James Hardie for my siding?"
Both are premium products. Both perform well in Michigan's freeze-thaw cycles. Both come with strong warranties and manufacturer backing. And both cost significantly more than vinyl — which is exactly why homeowners in Sterling Heights, Rochester Hills, and Grosse Pointe Farms spend hours researching before making a decision.
After 35+ years installing house siding in Detroit and across Southeast Michigan, we've installed hundreds of homes with both products. We've seen how they hold up through Michigan winters, how they respond to lake-effect moisture, and what happens when installation isn't done right.
This isn't a sales pitch for one over the other. It's a breakdown of what each product actually is, how they perform in Michigan's climate, what they cost, and when each one makes the most sense. By the end, you'll know which one fits your home, your budget, and your timeline.
Material Science: What Each Product Actually Is
Understanding what you're actually buying matters. These aren't just "non-vinyl siding options" — they're fundamentally different materials with different strengths and vulnerabilities.
James Hardie: Fiber Cement
James Hardie siding is fiber cement — a composite of Portland cement, sand, and cellulose fibers. Think of it as engineered concrete formed into planks. The material is autoclaved (cured under high pressure and steam), which makes it dimensionally stable and extremely dense.
The density is what gives Hardie its reputation. It's heavy — about 2.5 pounds per square foot for HardiePlank lap siding. That weight translates to impact resistance and sound dampening. A baseball hitting Hardie siding doesn't dent it. Hail storms that destroy vinyl leave Hardie untouched.
Fiber cement is also non-combustible. It won't ignite, won't contribute fuel to a fire, and earns a Class A fire rating. In neighborhoods with tight lot spacing or homes near wooded areas, that's a real advantage.
The downside? Weight and brittleness. Fiber cement doesn't flex. Drop a plank during installation and it can crack. Cut it without proper dust control and you're dealing with silica dust — a serious respiratory hazard that requires specific safety equipment.
LP SmartSide: Engineered Wood
LP SmartSide is engineered wood — specifically, oriented strand board (OSB) treated with a proprietary zinc borate solution and sealed with a SmartGuard coating. It's wood, but it's been engineered to resist the things that destroy regular wood siding: moisture, insects, and fungal decay.
The manufacturing process treats the wood strands before they're pressed and bonded, which means the protection goes all the way through the board, not just on the surface. The SmartGuard coating adds another layer of moisture resistance and UV protection.
LP SmartSide is lighter than Hardie — roughly 40% lighter for comparable profiles. That makes it easier to handle during installation, puts less load on wall framing, and allows for longer plank lengths without sagging.
It's also easier to cut and fasten. Standard carbide-tooth saw blades work fine. Fasteners don't require pre-drilling in most cases. Trim work goes faster because the material machines like wood — because it is wood.
The trade-off? It's still a wood product. Even with treatment and coating, it's more vulnerable to moisture intrusion than fiber cement if the installation isn't done correctly or if the coating gets damaged and isn't maintained.
Performance in Michigan's Climate
Michigan isn't kind to siding. We get freeze-thaw cycles from November through March. We get lake-effect moisture. We get summer heat and humidity that swells wood and expands materials. And we get wind-driven rain that tests every seam and flashing detail.
Here's how each product responds to the conditions that matter most in Macomb County, Oakland County, and St. Clair County.
Freeze-Thaw Cycle Resistance
Both products handle freeze-thaw cycles well — far better than vinyl, which can crack in extreme cold, and infinitely better than untreated wood, which rots.
James Hardie's fiber cement is dimensionally stable across temperature swings. It doesn't expand or contract significantly with temperature changes. Water absorption is minimal (less than 1% by weight), so there's very little moisture inside the material to freeze and cause internal cracking.
LP SmartSide expands and contracts slightly more than fiber cement — it's wood, after all — but the SmartGuard treatment keeps moisture absorption low enough that freeze-thaw damage isn't a concern when it's installed correctly. The key is proper fastening that allows for seasonal movement without binding.
In 35+ years of Michigan installations, we've seen freeze-thaw failures on both products exactly zero times. The failures we do see come from water getting behind the siding due to poor flashing or missing housewrap — and that destroys the sheathing, not the siding itself.
Ice Dam Exposure and Water Management
Ice dams are a Michigan reality. When attic heat melts snow on the roof, water runs down to the cold eaves and refreezes. Ice builds up, water backs up under shingles, and it finds its way into wall cavities — often right behind the siding.
Neither product is waterproof. Both rely on proper installation — drainage plane, flashing, and weep screeds — to manage water that gets behind them.
Fiber cement's low absorption rate means it won't swell or degrade when exposed to water temporarily. LP SmartSide's treatment provides similar protection, but prolonged water exposure (the kind you get from a chronic ice dam that isn't fixed) will eventually compromise the coating and allow moisture into the wood substrate.
The real solution? Fix the ice dam problem. Proper attic insulation in Metro Detroit and ventilation prevent ice dams from forming in the first place. If you're replacing siding on a home with a history of ice dams, address the attic before you spend $20,000 on new siding.
Summer Heat and Humidity
Michigan summers are humid. That humidity drives moisture into wall assemblies, and it tests how well siding materials resist swelling, warping, and fungal growth.
James Hardie doesn't absorb moisture from humidity. It's cement. Humidity doesn't make it swell, warp, or grow mold. The ColorPlus factory finish is baked on and resists fading from UV exposure better than field-applied paint.
LP SmartSide's zinc borate treatment inhibits mold and fungal growth even in humid conditions. The SmartGuard coating keeps moisture from penetrating the surface. But it's still wood underneath, which means proper ventilation behind the siding (using a rainscreen or furring strips) helps long-term performance, especially on south and west exposures that take the most sun and heat.
Wind-Driven Rain
Lake-effect weather doesn't just bring snow. It brings wind-driven rain that hits siding horizontally and finds every gap, every poorly sealed seam, every missing piece of flashing.
Both products shed water well when installed correctly. The key phrase: when installed correctly. That means proper overlap on horizontal lap siding, sealed butt joints on panel products, and flashing at every termination point — windows, doors, corners, and the bottom edge.
We've seen both products fail in wind-driven rain conditions, and it's always an installation issue, not a material issue. Caulk that wasn't applied. Flashing that wasn't installed. Housewrap that was skipped to save time. That's where water gets in, and once it's in, it doesn't matter how good the siding is.
Cost Comparison: Material + Installation
Let's talk numbers. Material cost is only part of the equation — labor matters just as much, and the two products require different amounts of time and skill to install correctly.
Material Costs (2026 Southeast Michigan Pricing)
As of early 2026, here's what we're seeing for material costs on typical residential projects in the Detroit metro area:
| Product | Material Cost per Sq Ft (Installed) | Notes |
|---|---|---|
| LP SmartSide Lap | $6.50 - $8.50 | Primed, requires field painting |
| LP SmartSide (Pre-finished) | $8.00 - $10.00 | Factory finish, limited color options |
| James Hardie Lap (Primed) | $7.50 - $9.50 | Requires field painting |
| James Hardie ColorPlus | $9.50 - $12.00 | Factory finish, 30+ color options |
Those prices include material, labor, trim, flashing, housewrap, and fasteners. They don't include removal of old siding, sheathing repair, or exterior painting in Southeast Michigan if you're going with primed product.
Labor Cost Differences
James Hardie takes longer to install. It's heavier, requires more careful handling, and demands specific cutting procedures to manage silica dust. Cutting fiber cement with a circular saw creates a dust cloud that requires OSHA-compliant respiratory protection and dust containment. Most experienced crews use shears or score-and-snap tools to avoid the dust issue, but that slows down the process.
Fastening also takes more time. Hardie requires pre-drilling in many cases to prevent cracking, especially near plank ends. Fasteners have to hit studs — the material is too dense to rely on sheathing alone.
LP SmartSide installs faster. It's lighter, cuts like wood, and doesn't require pre-drilling for most fasteners. A crew that can side 800 square feet of LP in a day might only get 600 square feet of Hardie done in the same time.
That labor difference shows up in the final price. On a 2,000-square-foot home, the installation cost for Hardie might run $1,500 to $2,500 more than LP SmartSide, even if the material costs are similar.
Long-Term Maintenance Costs
Both products require painting every 10-15 years if you go with primed versions. Factory-finished options (ColorPlus for Hardie, pre-finished for LP) extend that interval significantly — often 20-25 years before repainting is needed.
Hardie's ColorPlus finish is baked on in a controlled factory environment and comes with a 15-year warranty against peeling, cracking, and chipping. It's the most durable factory finish we've seen on any siding product.
LP's pre-finished option uses a coating system that's newer to the market. It performs well, but the track record isn't as long as Hardie's. We've installed it on dozens of homes over the past five years with no issues, but we can't speak to 20-year performance yet because the product hasn't been around that long.
If you're planning to stay in the home long-term, the factory-finished option pays for itself by eliminating one or two paint cycles. If you're selling in 5-10 years, primed siding with a quality paint job from a Southeast Michigan painting professional is the more cost-effective route.
Installation Differences That Matter
Installation quality determines how long your siding lasts. Both products have specific requirements that, if ignored, void the warranty and lead to premature failure.
Weight and Structural Requirements
James Hardie's weight — roughly 2.5 pounds per square foot — means you need solid attachment to framing. Fasteners must hit studs, not just sheathing. On older homes with 24-inch stud spacing (common in pre-1970s construction), that can complicate installation and require additional blocking or furring.
LP SmartSide's lighter weight allows for more flexibility. It can be fastened to sheathing in some applications, though we still prefer hitting studs for long-term hold. The reduced weight also means less stress on wall framing, which matters on older homes where framing might be undersized by modern standards.
Fastening Specs
Both manufacturers publish detailed fastening requirements. Ignoring them voids the warranty.
For James Hardie lap siding:
- Fasteners must be hot-dipped galvanized or stainless steel
- Blind-nail at the top of each plank, 1 inch from the top edge, into studs
- Face-nail only at specific locations (corners, terminations) and only after pre-drilling
- Minimum 1¼-inch penetration into framing
For LP SmartSide lap siding:
- Hot-dipped galvanized or stainless steel fasteners
- Blind-nail at the top, ¾ inch from the top edge
- Face-nailing allowed without pre-drilling in most cases
- Minimum 1½-inch penetration into framing or ¾ inch into sheathing (depending on application)
We see DIY and low-bid contractors skip these specs constantly. They use roofing nails instead of siding nails. They don't hit studs. They over-drive fasteners and crack the material. Then the siding fails in five years, and the homeowner blames the product instead of the installation.
Trim Work and Finish Details
Trim is where craftsmanship shows — or doesn't.
James Hardie offers fiber cement trim boards that match the siding. They're heavy, require careful cutting, and need pre-drilling for fasteners. Corners are typically done with factory-formed outside corner trim or mitered using HardieTrim boards. Mitering fiber cement requires precision — there's no margin for error because the material doesn't flex to close gaps.
LP SmartSide trim machines like wood. Miters are easier. Coping inside corners is straightforward. The material is more forgiving during installation, which means cleaner finished details if the installer knows what they're doing.
Both products require caulking at trim joints, corner boards, and terminations. That caulk needs to be paintable, flexible, and compatible with the siding material. We use Sherwin-Williams Emerald Exterior Acrylic Latex Caulk on both products — it adheres well, flexes with seasonal movement, and doesn't crack after a Michigan winter.
Common Installation Mistakes We Fix
We're called in to fix bad siding jobs several times a year. Here are the mistakes we see most often:
- No drainage plane: Siding installed directly over sheathing with no housewrap or building paper. Water gets behind the siding, the sheathing rots, and the siding fails within 5-10 years.
- Missing flashing: No flashing above windows and doors, no kickout flashing where roof edges meet walls, no drip edge at the bottom. Water runs behind the siding and destroys the wall assembly.
- Wrong fasteners: Roofing nails instead of siding nails. Fasteners that rust out in three years. Over-driven fasteners that crack fiber cement or compress LP too much.
- Improper overlap: Lap siding that doesn't overlap enough, leaving gaps that let water through. Panel joints that aren't caulked or flashed.
- No expansion gaps: Siding butted tight against trim, corner boards, or J-channels with no room for seasonal expansion. The siding buckles in summer heat.
These aren't product failures. They're installation failures. And they're why choosing an experienced contractor matters more than choosing between LP and Hardie.
Warranty Coverage Reality
Warranties sound great in the showroom. Understanding what they actually cover — and what voids them — matters when you're making a decision.
James Hardie Warranty Terms
James Hardie offers a 30-year non-prorated warranty on HardiePlank and HardiePanel products. That covers defects in materials and manufacturing — things like delamination, cracking due to material defects, or premature deterioration.
The ColorPlus finish carries a separate 15-year warranty against peeling, cracking, and chipping of the factory finish.
What voids the warranty:
- Installation that doesn't follow Hardie's published best practices
- Using non-approved fasteners or fastening methods
- Damage from impact, fire, or severe weather (that's what homeowners insurance is for)
- Painting over ColorPlus finish within the warranty period (voids the finish warranty)
The warranty is transferable to a new homeowner, which adds resale value. But transfer requires notifying James Hardie and may involve a fee.
LP SmartSide Warranty Terms
LP SmartSide offers a 50-year prorated warranty on the substrate (the engineered wood itself) and a 5-year warranty on the SmartGuard treatment and primed finish. The pre-finished product carries a 15-year finish warranty.
The 50-year substrate warranty sounds impressive, but it's prorated — coverage decreases over time. After 10 years, you're getting partial coverage. After 25 years, you're getting minimal coverage. It's better than nothing, but it's not a 50-year bumper-to-bumper warranty.
What voids the warranty:
- Installation that doesn't meet LP's installation instructions
- Failure to paint primed product within 180 days of installation
- Using non-approved fasteners or installation methods
- Damage from termites, carpenter ants, or other pests (even though the product is treated to resist them)
LP's warranty is also transferable, and the transfer process is simpler than Hardie's — usually just requires notifying LP with proof of purchase.
The Warranty Reality Check
Here's the truth about siding warranties: they rarely get used. Most siding failures are installation-related, not material defects. And proving that a failure is due to a manufacturing defect — rather than installation error, maintenance neglect, or weather damage — is difficult.
We've filed warranty claims on both products over the years. The process is slow, requires extensive documentation, and often results in partial coverage or denial based on installation technicalities.
The better insurance policy? Hire a contractor who knows how to install the product correctly. That prevents failures in the first place. When we install siding — whether it's LP, Hardie, or any other product — we follow manufacturer specs exactly. Not because we're worried about warranty claims, but because that's how you build something that lasts.
When to Choose Each Product
So which one should you choose? It depends on your priorities, your budget, and your home's specific conditions.
Choose James Hardie If:
- Impact resistance is a priority: Homes near golf courses, ball fields, or areas with frequent hail benefit from Hardie's density and toughness.
- Fire resistance matters: Homes in wooded areas, near wildfire-prone regions (northern Michigan), or in neighborhoods with tight lot spacing get real value from non-combustible siding.
- You want the longest-lasting factory finish: ColorPlus is the most durable factory finish on the market. If you're staying in the home 20+ years and want to minimize maintenance, it's worth the premium.
- You're okay with higher upfront cost: Hardie costs more to buy and install, but it holds value and requires less maintenance over time.
- Your home has modern framing: Newer homes with 16-inch stud spacing and solid sheathing are ideal for Hardie's weight and fastening requirements.
Choose LP SmartSide If:
- Budget is a concern: LP delivers premium performance at a lower cost than Hardie, especially when you factor in faster installation.
- You want easier future repairs: LP is easier to cut, fit, and replace if a section gets damaged. Finding a contractor willing to repair LP is easier than finding one with the tools and skills for Hardie.
- Your home has older framing: Lighter weight means less stress on older wall framing and more flexibility in fastening options.
- You prefer the look of wood grain: LP has a more pronounced wood texture than Hardie. If you like the look of wood siding but want better durability, LP delivers that aesthetic.
- You're working with a tight timeline: Faster installation means less disruption and quicker project completion.
When Either Product Works
For most homes in Macomb County, Oakland County, and St. Clair County, either product will perform well for 30-50 years if installed correctly. The decision often comes down to aesthetics, budget, and contractor availability.
We install both products regularly. We don't push one over the other. We ask about your goals, your budget, and your timeline, and we recommend the product that makes the most sense for your situation.
If you're replacing siding as part of a larger exterior renovation — new windows in Detroit, a roof replacement in Metro Detroit, or updated seamless gutters in Detroit, MI — the siding choice should complement the overall project. Sometimes that means matching the siding to the window trim material. Sometimes it means choosing based on color options that work with your new roof.
Related Services: Siding replacement often pairs with other exterior upgrades. NEXT Exteriors offers comprehensive exterior services in Detroit, including roofing, windows, gutters, insulation, and painting — all from one licensed contractor with 35+ years of experience.
Ready to Get Started?
NEXT Exteriors has been protecting Michigan homes since 1988. We install both LP SmartSide and James Hardie siding, and we'll help you choose the right product for your home, budget, and goals. Get a free, no-pressure estimate from a team that shows up on time and does the job right.
Get Your Free QuoteOr call us: (844) 770-6398
Frequently Asked Questions
James Hardie is typically more expensive — both for materials and labor. In Southeast Michigan, Hardie ColorPlus (factory-finished) runs $9.50-$12.00 per square foot installed, while LP SmartSide pre-finished runs $8.00-$10.00 per square foot. Hardie also takes longer to install due to its weight and cutting requirements, which adds to labor costs. For a 2,000-square-foot home, expect to pay $1,500-$2,500 more for Hardie than LP SmartSide.
Both products last 30-50+ years in Michigan when installed correctly. James Hardie's fiber cement is extremely durable and resistant to freeze-thaw cycles, moisture, and impact. LP SmartSide's engineered wood with SmartGuard treatment performs similarly in Michigan's climate. The key factor isn't the product — it's the installation quality. Proper flashing, drainage plane, and fastening determine longevity more than material choice.
No. LP SmartSide is treated with zinc borate throughout the material (not just on the surface), which prevents rot, fungal decay, and termite damage. The SmartGuard coating adds another layer of moisture protection. We've installed LP SmartSide on hundreds of Michigan homes over the past 15+ years and haven't seen rot issues when the product is installed with proper flashing and drainage. Regular wood siding, by contrast, will rot within 10-15 years in Michigan's climate without constant maintenance.
Yes, but it may void the finish warranty. James Hardie's ColorPlus warranty is voided if you paint over the factory finish within the 15-year warranty period. LP SmartSide's pre-finished warranty has similar restrictions. If you want a custom color not available in factory finishes, go with primed siding and have it painted by a professional using high-quality exterior paint (we use Sherwin-Williams products exclusively). The finish won't be quite as durable as factory-applied, but you'll get the exact color you want.
Both add significant resale value compared to vinyl siding. James Hardie has stronger brand recognition among homebuyers and realtors, which can be an advantage in competitive markets like Grosse Pointe Farms or Rochester Hills. However, LP SmartSide is gaining recognition and delivers similar curb appeal at a lower cost. If you're selling within 5-10 years, either product will recoup 70-85% of the installation cost in increased home value. The bigger factor is condition and appearance — well-maintained siding in a current color sells better than premium siding that looks dated.
Not necessarily, but it's often the most cost-effective time to do it. When we remove old siding, we expose the window trim and flashing — which makes window replacement easier and ensures proper integration between new windows and new siding. If your windows are more than 20 years old, single-pane, or showing signs of seal failure (condensation between panes), replacing them during a siding project makes sense. We offer comprehensive window replacement in Detroit and can coordinate the entire exterior renovation in one project.
Ask to see their installation plan and verify they're following manufacturer specs. Key things to look for: housewrap or building paper behind the siding, flashing above all windows and doors, proper fastener type and placement, and correct overlap on lap siding. A good contractor will walk you through the installation process and show you the details that matter. At NEXT Exteriors, we follow James Hardie Best Practices and LP SmartSide installation guidelines exactly — and we document the process with photos for our records and your peace of mind.