Allura vs James Hardie Siding: What's Actually Different
By Bay Area Siding Company
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Allura and James Hardie are both fiber cement siding, and on paper they are close. Both make 5/16-inch-thick lap siding, both pass the ASTM E136 noncombustibility test, and both currently carry a 30-year limited product warranty. The real differences are in factory finish options, product range, local availability and how much installers know each system. For most Bay Area homes those practical differences matter more than the board itself.
Allura vs Hardie at a glance
| James Hardie | Allura | |
|---|---|---|
| Material | Fiber cement | Fiber cement |
| Lap siding thickness | 5/16 in | 5/16 in |
| Fire | Noncombustible (ASTM E136) | Noncombustible (ASTM E136); on CAL FIRE's building materials listing |
| Product warranty | 30-year limited, non-prorated (siding, trim and soffit substrate) | 30-year transferable limited product warranty |
| Factory finish | ColorPlus, with a separate 15-year limited finish warranty | Ask your supplier what prefinished options are stocked locally; otherwise field painted |
| Climate-specific formulas | HZ5 for freeze-thaw climates, HZ10 for warmer ones | Not sold by climate zone |
| Product range | Lap, panel, shingle, Artisan thick-profile, Architectural Collection, trim, soffit | Lap, panel, shake, soffit, trim |
| Manufacturing | Includes a plant in Fontana, California | Owned by Elementia; U.S. plants include Terre Haute, Indiana |
Warranty and product details change. Check each manufacturer's current warranty document before you sign a contract; we link to both at the end of this article.
Where they are the same
The material
Both products are made from portland cement, sand and cellulose fibers pressed into boards and panels. That gives them the same core strengths: they don't rot, termites don't eat them, they hold paint far longer than wood, and they don't melt or warp in heat the way vinyl can.
Fire performance
Both are classified as noncombustible under ASTM E136. In California's wildfire-zone building rules, noncombustible exterior wall covering is one of the accepted compliance paths, so either product can work on a lot in a Fire Hazard Severity Zone. Allura's lap, panel, shake and soffit products also appear on CAL FIRE's building materials listing as ignition-resistant. The siding is only one part of a fire-resistant wall; vents, eaves and the details at decks and roofs matter just as much. Our fire-resistant siding guide covers the full picture.
Thickness and weight
Standard lap siding from both brands is 5/16 inch thick. Both are heavy compared with vinyl or engineered wood, and both need fiber cement cutting tools and dust control during installation.
Where they differ
Factory finish
This is the biggest practical difference. James Hardie's ColorPlus finish is baked on at the factory in a wide palette and carries its own 15-year limited finish warranty. A factory finish usually lasts longer than field paint and saves a painting step on site. With Allura, ask your supplier which prefinished options are available in your area. If only primed boards are stocked, budget for a full paint job after installation and repainting on a normal schedule.
Our ColorPlus colors guide covers how those colors look in Bay Area light.
Climate formulas
James Hardie makes two formulations under its HardieZone system: HZ5 for climates with freezing, snow and ice, and HZ10 for warmer climates. Allura does not market zone-specific versions. In most of the Bay Area freeze-thaw is not a big factor, so this matters less here than in the mountains.
Product range
Hardie's lineup is broader, especially at the premium end: thicker Artisan lap and V-groove profiles, the Architectural Collection panels, and matching trim, soffit and fascia. If you want a specific modern profile or a deep shadow line, Hardie is more likely to have it. Allura covers the common profiles (lap, vertical panel, shakes) well.
Availability and installer experience
Hardie has a plant in Fontana, California and broad West Coast distribution, so most colors and profiles are easier to get here and most siding crews know its installation rules. Allura's best-known U.S. plant is in Terre Haute, Indiana. Before choosing Allura, confirm your supplier stocks the profile and color you want and what the lead time is. Running out of material mid-project, or patching later with a board from a different batch, is a real problem with any siding.
Price
Allura is generally marketed as a value alternative to Hardie. Keep in mind that the board is a small share of the installed price. Tear-off, sheathing repair, weather barrier, flashing, trim, labor and paint make up most of the job, and those costs are the same for either brand. If Allura needs field painting and Hardie ColorPlus doesn't, the savings on material can disappear. Compare finished, painted prices, not price per board. Our siding replacement cost guide lists the other cost drivers.
Installation matters more than the brand
Most fiber cement problems come from installation, not from the product. The usual failures are missing kick-out flashing at roof-wall corners, siding run down onto roofs or into soil without clearance, unsealed cut ends and nails overdriven into the face. James Hardie's literature states that installing outside its written instructions can void the product warranty. Read Allura's warranty for its installation conditions as well.
Whichever brand you choose, ask the contractor how they handle:
- Clearance at roofs, decks and grade
- Flashing at windows, doors and roof-wall intersections
- Butt joints and cut-end sealing
- Fastener type and placement
- The weather barrier behind the siding
Our article on what a correct James Hardie install looks like walks through each one.
Which should you choose?
- Choose James Hardie if you want a factory finish, a specific premium profile, matching Hardie trim and soffit, or the widest choice of installers and local stock.
- Allura makes sense if your supplier stocks the profile you want, you plan to paint anyway, and the finished, installed price is meaningfully lower.
- Don't mix them on the same wall. Textures, profiles and widths are close but not identical, and the difference shows.
Most of the homes in our project gallery are James Hardie, largely because of ColorPlus and the trim system. If you are weighing the two for your home, we can quote both in a free written estimate.
Frequently asked questions
Is Allura as good as James Hardie?
The core material is very similar: both are 5/16-inch fiber cement and both are noncombustible under ASTM E136. Hardie has a broader product line, climate-specific formulas and the ColorPlus factory finish. Allura can perform well when it is installed correctly and painted properly.
Is Allura cheaper than Hardie?
Allura is usually marketed as the lower-cost option, but material is a small part of the installed price. Labor, tear-off, repairs, flashing and paint make up most of the cost. Compare finished, painted prices for the same scope.
Which has the better warranty?
Both currently publish a 30-year limited product warranty. James Hardie adds a separate 15-year limited warranty on its ColorPlus finish. Terms change, so read each manufacturer's current warranty document before you sign.
Are Allura and Hardie fire resistant?
Yes. Both are classified as noncombustible when tested to ASTM E136, and noncombustible siding is an accepted option under California's wildfire-zone building rules. Allura also appears on CAL FIRE's building materials listing.
Can I use Allura to repair a Hardie wall?
It is not recommended. The profiles and textures are close but not identical, so a repair with the other brand usually shows. Match the original manufacturer and profile where possible.
Sources
The information provided here is intended for general reference and should not be considered professional advice. Before starting any project, consult a licensed contractor. Product features, specifications, and warranties may have been updated since this was published. Any mention of brands or products reflects personal opinion and does not constitute an endorsement or warranty.
