Building on Piers, Helical Piles, and Screw Piles: A Guide to Foundation Options.

Choosing the right foundation is critical when building a structure, as it determines the stability and longevity of the home. In certain conditions, traditional foundations aren’t always the best option.  In this guide, we’ll explore these foundation options, their benefits, and how to decide which is right for your project.

Why Consider Alternative Foundations?

Certain sites whether sloped, prone to flooding, or with unstable soil are not suitable for conventional concrete foundations. Concrete Piers, Helical Piles, and Screw Piles offer solutions in these situations, often being quicker and more affordable to install, while minimizing environmental impact.

Building on Piers

Piers are vertical supports made from concrete, steel, or wood that elevate a structure off the ground. They’re ideal for flood-prone areas or steep terrain.

Benefits of Concrete Pier Foundations:

1. Cost-Effective: Less material and labor than a full concrete foundation.
2. Adaptable: Suitable for challenging terrain and poor soil.
3. Environmentally Friendly: Minimal land disturbance and excavation required.
4. Ventilation: Elevating the structure promotes natural air flow, helping to manage moisture.

Drawbacks:

• Proper curing of concrete takes time, usually around 28 days to reach full strength. This can delay the construction process.
• If not installed correctly, individual piers may settle unevenly, leading to structural instability and uneven floors.

Helical Piles

Helical piles are steel shafts that are driven deep into the ground. These piles offer superior load-bearing capacity and can be installed quickly with minimal site disruption.

Benefits of Helical Piles:

1. Fast Installation: Takes hours per pile with minimal disruption.
2. Strong Load-Bearing Capacity: Supports larger structures effectively.
3. Year-Round Use: Can be installed in all weather conditions.
4. Adjustable: Easy to re-level in unstable soils.

Drawbacks:

• Requires specialized machinery for installation.
• Helical piles are typically made of steel, which can corrode over time, especially in highly acidic or alkaline soils. Galvanization or protective coatings are needed, adding to costs.

Screw Piles

Screw piles are smaller, lighter versions of helical piles, suitable for lighter structures like decks or small homes. Unlike helical piles, they screw into the ground for quick installation and immediate use.

Benefits of Screw Piles:

1. Easy Installation: Requires less machinery, making them more accessible.
2. Eco-Friendly: Minimal impact on the environment.
3. Great for Soft Soils: Adaptable to unstable ground conditions.
4. Immediate Use: Can bear weight right after installation.

Drawbacks:

• Not ideal for heavy structures.
• In highly expansive soils such as clay or loose, sandy soils, screw piles can experience movement or shifting, reducing their effectiveness as a stable foundation.

Conclusion

Concrete Piers, Helical Piles, and Screw Piles are all practical alternatives to traditional foundations, especially in difficult terrain or where quick installation is necessary. Each has its strengths and is suited to specific conditions, so choosing the right foundation depends on your site, project size, and budget. Consulting with a foundation expert ensures you’ll make the best decision for long-term stability and success.