Ornamental fencing — what most homeowners call "iron fence" — is primarily manufactured from aluminum or steel, not actual wrought iron. Understanding the differences between these materials, their coatings, panel construction types, and installation methods is essential to getting the right fence for your property.
Aluminum vs. Steel: The Core Difference
Aluminum
- Lightweight — easier to handle during installation, requires less heavy equipment
- Naturally corrosion-resistant — doesn't rust, making it ideal for pool areas, coastal environments, and humid climates
- Lower strength-to-weight ratio — adequate for residential and light commercial applications but not suitable for high-security
- Installation method: Primarily punched post systems — posts come factory-routed with holes that accept rail insertion. Panels and posts are installed simultaneously.
- Cost: $25–$40 per linear foot installed
Steel
- Heavier and stronger — better for commercial, industrial, and security applications
- Will rust if coating is compromised — coating quality and maintenance are critical
- Installation methods: Bracket systems (panels attach to posts via steel brackets) or welded in place (panels are field-welded to posts for maximum strength)
- Cost: $30–$55 per linear foot installed
The homeowner's rule: If you're fencing a residential yard, pool, or decorative perimeter, aluminum is usually the right choice. If you need security, commercial-grade durability, or the fence borders a high-traffic area, steel is worth the premium.
Panel Construction Types
How pickets attach to rails determines the fence's ability to follow terrain:
1. Rackable (Adjustable) Panels
Panels that adjust to match grade changes. The picket-to-rail connection allows angular movement so the fence can follow a slope without stepping. Rackable panels use one of several technologies:
- Internal pin-hinge — pickets pivot on pins within the rail
- Rivets — allow limited angular movement
- Retaining rods — hold pickets in place while allowing rack
Best for: Properties with gradual slopes, hillsides, and uneven terrain.
2. Flat-Top (Rigid) Panels
Standard panels with fixed picket-to-rail connections. Cannot rack — must be stair-stepped on sloped terrain, creating gaps under each section.
Best for: Flat properties or where a stepped appearance is acceptable.
3. Stacking Panels
Designed to be installed one above another for increased height, typically in commercial applications.
Key installation detail: Most ornamental panels are designed to be installed 2 inches above finished grade. This gap prevents moisture wicking, allows drainage, and avoids frost heave damage.
Coatings: What Protects Your Fence
The coating is what stands between your fence and corrosion. There are five primary coating types used in the ornamental fence industry:
1. Powder Coat
Applied as a dry powder electrostatically, then cured under heat. This is the most common residential ornamental fence finish. Produces a uniform, durable color layer.
2. Paint (Shop or Field Applied)
Applied via spray, manual brush, or electrostatic methods. Less durable than powder coat but easier to touch up and field-repair.
3. Galvanized
Zinc coating applied to prevent rust. Two sub-types:
- Pre-galvanized: Zinc applied during the raw material manufacturing process
- Hot-dipped: Raw material submerged in molten zinc after manufacturing — provides thicker, more durable zinc coverage
4. Electrodeposition (E-Coat)
The workpiece is submerged in a paint/water bath and electricity deposits paint onto the surface. Provides extremely uniform coverage, including inside hollow tubes and hard-to-reach areas. Often used as a primer layer beneath powder coat for premium "double-coated" products.
5. Anodized Aluminum
An electrochemical process that converts the aluminum surface into a durable, corrosion-resistant oxide finish. Anodizing is not a coating added on top — it transforms the metal surface itself.
The quality hierarchy for steel ornamental: Hot-dipped galvanized + e-coat primer + powder coat top coat = maximum corrosion protection. Budget products may skip the galvanizing or e-coat layer.
Installation Methods by Material
Aluminum: Punched Post System
- Set the first post (plumb, level, in concrete)
- Insert panel rails into the routed holes in the post
- Set the next post simultaneously, feeding rail ends into its routed holes
- Repeat — each post and panel are installed together in sequence
Critical detail: Extra care is needed to ensure each post is at correct height, in line, and plumb. Once you're three panels in, going back to fix post #1 means removing everything.
Steel: Bracket System
- Set all posts first to line and grade
- Attach panels to posts using steel mounting brackets
- Secure with hardware per manufacturer specs
Advantage: Posts can be set and verified before panels go up, reducing alignment errors.
Steel: Welded In Place
- Set posts
- Position panels between posts
- Field-weld panel rails to posts
Strongest connection but requires a certified welder on the crew. Used for commercial, industrial, and high-security applications. Touch-up coating is required at all weld points.
Gate Considerations
Ornamental fence gates share the same materials and coatings as panels but have additional requirements:
- Gate posts need larger diameter and deeper footings than line posts — they bear the full weight of the swinging gate plus lateral stress from opening/closing
- Hardware quality matters — hinges, latches, and self-closing mechanisms should match the fence's expected lifespan
- Pool code compliance — if the ornamental fence encloses a pool, gates must be self-closing and self-latching per local building codes
What to Ask Your Contractor
- Is this aluminum or steel?
- What coating system is used (single powder coat? galvanized + powder coat?)
- Are the panels rackable? (Critical if your property has any slope)
- What's the warranty on the finish?
- How are panels attached to posts? (Punched, bracket, or welded?)
- What size are the post footings?
The answers tell you everything about whether you're getting a premium installation or a budget job with a premium price tag.
*Source: American Fence Association Fence Installation School, ASTM F2631-07*