Displacement Piles vs. CFA Piles: Which Foundation Works Best in Weak Soils?

When engineers face loose sands, soft clays, or other weak soils, two common foundation solutions come to mind: displacement piles and CFA piles. Both systems have been used successfully in deep foundations for decades, but recent innovations, like Chance’s GroutForce™ Displacement Pile (GDP), are shifting the way we think about load capacity, installation efficiency, and overall project cost. 

In this article, we’ll compare CFA piles and displacement piles, highlight their strengths and limitations, and show how the patented GroutForce™ system offers a smarter alternative for today’s most challenging sites. 

What Are CFA Piles? 

Continuous Flight Auger (CFA) piles are a type of cast-in-place foundation system. They’re installed by drilling into the soil with a hollow-stem auger, then pumping concrete or grout as the auger is withdrawn. Reinforcement can then be placed into the wet pile shaft. 

Strengths of CFA piles: 

• High load capacity 

• Commonly accepted in codes and specifications 

• Suitable for a wide range of soils 

Weaknesses of CFA piles: 

• Produces spoils that require handling and disposal 

• Have a history of discontinuity of shaft. 

• Typically requires deeper embedment to reach capacity 

• Relies on heavy, specialized equipment 

• Installation can be slower and more expensive in urban or space-limited sites 

What Are Helical Displacement Piles? 

Displacement piles are designed to densify soil instead of removing it. As the pile is advanced, the soil is displaced laterally, creating a cavity that can be filled with grout. The sides of the hole are striated by the helix plate, so rather than a slickened sidewall, the side of the hole is rough and irregular. This improves soil strength, increases shaft friction, and eliminates spoil handling. 

General benefits of displacement piles: 

• No spoils to remove or transport 

• Soil densification improves overall capacity 

• Can be installed in loose sands and soft clays 

• Shorter pile lengths compared to CFA piles 

Introducing the GroutForce™ Displacement Pile 

Developed by Chance™, the GroutForce™ Displacement Pile (GDP) is the next step forward in grouted foundation technology. This patented pile system creates a large-diameter grout column with an intact soil plug, enhancing both axial and lateral capacity. 

Key features of GroutForce™ Displacement Pile: 

• Over 500-kip axial capacity 

• Up to 50% shorter pile length vs. traditional piles 

• Superior lateral resistance thanks to grout suction and densification 

• Corrosion protection from the grout column in aggressive soils 

• Reduced project costs through faster installation and less material use 

Displacement Piles vs CFA Piles – Key Differences 

Here’s how CFA piles compare to Chance’s GroutForce™ system: 

Feature	CFA Piles	GroutForce™ Displacement Piles
Installation Method	Drilled with auger, spoils removed	Soil displaced, grout fills void
Soil Impact	Minimal densification	Significant densification
Shaft Length	Typically longer	Up to 50% shorter
Spoils	Requires handling & disposal	None
Capacity	High, but depth-dependent	500+ kip axial + strong lateral
Equipment	Heavy, specialized rigs	Standard helical installation equipment – no overhead height limitations

When to Choose GroutForce™ Over CFA 

While CFA piles remain useful, GroutForce™ delivers better performance in many conditions: 

• Loose sands and soft clays 

• Sites with spoil removal concerns 

• Projects requiring shorter piles to reduce costs 

• Aggressive soils where corrosion protection is critical 

• Urban projects where speed and efficiency matter 

With its patented design, GDP is a shorter, stronger, and smarter alternative to CFA piles, offering engineers and contractors a reliable solution that saves both time and money. 

Conclusion 

Displacement piles and CFA piles both play important roles in foundation engineering, but the GroutForce™ Displacement Pile represents the next generation of pile technology. With unmatched axial and lateral capacity, shorter shaft lengths, and spoil-free installation, GDP is quickly becoming the preferred option for challenging soil conditions. 

When performance, efficiency, and constructability all matter, the difference between a standard solution and the right solution becomes clear. GroutForce™ isn’t just an alternative to CFA piles, it’s an advancement in how we approach weak soil challenges. 

If you’re evaluating foundation options for an upcoming project, the team at Atlas is ready to help you determine whether GroutForce™ is the right fit. Reach out to start a conversation and see how you can build smarter from the ground up.