Choosing the Right Armco Barrier Posts for Commercial Premises

A technical guide for sites with mixed vehicular and pedestrian traffic

Protecting people, buildings, and infrastructure on a commercial site requires a barrier system that is robust, predictable under impact, and appropriate for how the space is actually used. Armco safety barrier systems have become the industry standard across industrial estates, distribution centres, retail parks, car parks, and logistics hubs for precisely these reasons.

Armco Barrier Supplies manufacture a full range of Armco barrier posts designed to work with standard corrugated steel beams, offering solutions for both bolt-down and dig-in installations. This article explains how the different post types perform, how to specify them correctly, and what to consider when installing Armco barriers around a live commercial environment with both vehicles and pedestrians present.

Understanding the role of the Armco post

While the Armco beam is the visible part of the system, the post is the primary load-bearing component. In an impact, the post transfers vehicle energy into the ground or slab, controls deflection, and prevents vehicle override or barrier failure.

A well-specified post will:

• Absorb and dissipate impact forces
• Maintain beam height under load
• Prevent vehicle encroachment into pedestrian areas
• Minimise damage to surrounding structures
• Reduce maintenance and replacement costs after minor impacts

Post selection should therefore be driven by traffic type, speed, weight, and available fixing substrate.

Bolt-Down vs Dig-In Armco Barrier Posts

Bolt-down Armco Barrier Posts

Bolt-down posts are base-plated and mechanically fixed to concrete using anchor bolts. They are ideal where excavation is not possible or where the barrier is being installed onto:

• Existing concrete slabs
• Yard aprons
• Warehouse floors
• Multi-storey or podium decks

Advantages

• Fast installation
• No ground disturbance
• Easier to remove or relocate
• Ideal for retrofit projects

Considerations

• Slab thickness and concrete strength must be verified
• Anchor selection is critical to performance
• Higher point loads are transferred into the slab

Dig-in posts

Dig-in posts are embedded directly into the ground and backfilled with concrete. They are typically used where maximum strength and energy absorption are required.

Advantages

• Superior resistance to heavy vehicle impacts
• Better energy dissipation through soil and concrete
• Reduced reliance on surface slab integrity

Considerations

• Requires excavation
• Longer installation time
• Less suitable where services are present

Overview of available Armco barrier post types

RSJ Bolt Down

A heavy-duty rolled steel joist (RSJ) section with a welded base plate.

Typical applications

• HGV routes
• Forklift traffic areas
• Building protection zones
• High-risk perimeter edges

Technical notes

• Excellent bending resistance
• Works well with single or double beam systems
• Requires structurally sound concrete

RSJ Bolt Down – Double Beam

Designed to support two parallel Armco beams, increasing barrier height and impact performance.

Typical applications

• Separation of vehicles and pedestrians
• Protection of walkways
• High-risk loading bays

Technical notes

• Improved containment
• Reduces risk of vehicle override
• Often paired with handrail systems

RSJ Bolt Down – Flexi Post

Engineered to provide controlled deflection under impact rather than rigid resistance.

Typical applications

• Car parks
• Low-speed vehicle areas
• Areas where impact damage must be minimised

Technical notes

• Absorbs impact energy
• Reduces damage to vehicles
• Lower rebound risk for pedestrians nearby

Z Post Bolt Down

A lighter-profile post offering a cost-effective solution for lower-risk areas.

Typical applications

• Car parks
• Light commercial traffic
• Internal warehouse environments

Technical notes

• Easier handling and installation
• Suitable for standard beam heights
• Not recommended for HGV impact zones

Spring Buffer Bolt Down

A specialist post incorporating a spring mechanism to absorb energy.

Typical applications

• Column protection
• Doorways

Repeated low-speed impact locations

Technical notes

Designed for repeated impacts

Reduces structural damage

Extends barrier lifespan in high-contact areas

RSJ Dig In

The strongest standard post option, embedded into concrete foundations.

Typical applications

• External perimeters
• HGV yards
• High-speed vehicle routes

Technical notes

• Exceptional impact resistance
• Best choice where ground conditions allow
• Ideal for critical asset protection

Z Post Dig In

A balance between strength and economy for external installations.

Typical applications

• Site boundaries
• Car park perimeters
• Segregation of traffic routes

Technical notes

• Good strength-to-cost ratio
• Suitable for mixed vehicle types
• Requires correct embedment depth

Finishes and durability

All posts from Armco Barrier Supplies are available as:

• Hot-dip galvanised – providing long-term corrosion resistance suitable for outdoor use
• Galvanised & powder coated – offering enhanced visibility and site-specific colour coding

Powder coating is often specified in high-visibility colours (yellow, red, or black/yellow) to improve driver awareness and pedestrian safety.

Handrail integration for pedestrian safety

Where pedestrians are present, Armco systems are frequently combined with handrail fittings mounted above the beam. This creates a dual-purpose barrier that:

• Physically restrains vehicles
• Provides visual and physical separation for pedestrians
• Improves compliance with workplace safety guidance

Handrails are particularly important along walkways, crossings, and building entrances.

Installation and layout considerations

When fixing Armco barriers around commercial premises:

• Maintain consistent post centres (typically 1.6 m to 2.0 m)
• Ensure beam height aligns with vehicle bumper heights
• Avoid gaps near corners or access points
• Consider deflection space behind the barrier
• Account for drainage, services, and slab joints

A poorly positioned barrier can be as ineffective as no barrier at all.

Armco Barrier Posts Selection

Selecting the correct Armco barrier post is a technical decision that should reflect:

• Vehicle type and speed
• Impact risk
• Ground or slab conditions
• Pedestrian proximity
• Long-term durability requirements

By choosing the appropriate combination of RSJ, Z post, flexi, or spring buffer designs, installed as bolt-down or dig-in systems, commercial sites can significantly reduce accident risk while maintaining efficient vehicle movement.

Armco Barrier Posts – FAQs

1. Can bolt-down Armco posts stop HGVs?
Yes, provided the correct post type (such as RSJ bolt-down), beam configuration, and anchor specification are used, and the concrete slab is structurally adequate.

2. Are dig-in posts always better than bolt-down posts?
Not always. Dig-in posts offer higher ultimate strength, but bolt-down posts are often more practical and entirely suitable for many commercial environments.

3. Do I need handrails if I already have Armco beams?
If pedestrians regularly use the area, handrails are strongly recommended to improve visibility, separation, and overall safety.