Decking Foundations Compared: Ground Screws vs Traditional Bases
Building a new decking area is an exciting upgrade for any outdoor space, but choosing the right foundation is crucial for long-lasting performance.
In this guide, we compare ground screws with traditional concrete bases, helping you make an informed decision for your decking project.
What Are Ground Screw Foundations?
Ground screws are engineered steel foundations that are screwed directly into the earth to create stable support points. These innovative foundation solutions are galvanised for durability and can be installed quickly without excavation or concrete.
How Ground Screws Work
Each screw features a steel shaft with helical blades that twist into the soil, anchoring deeply to provide solid support. Once installed, the top of the screw connects directly to decking joists or structures via brackets, creating a strong, level base.
Key Characteristics:
- Installed without digging or heavy machinery
- Immediate load-bearing capacity
- Works in most soil types, including uneven ground
- Can be removed or relocated without damage to the landscape
What Are Traditional Concrete Bases?
Traditional decking foundations typically involve digging post holes and pouring concrete footings. Each footing needs time to cure before any construction can begin.
Typical Features:
- Heavy groundwork and excavation
- Concrete curing time (often several days)
- Soil disposal and mess
- Requires planning for freeze/thaw movement depending on location
Concrete creates a permanent foundation, but the process can be time-consuming and disruptive to your garden.
Side-by-Side Comparison: Ground Screws vs Concrete Bases
Installation Time & Convenience
Ground Screws:
Ground screws can often be installed in just a few hours with minimal disruption. There’s no waiting for concrete to cure, decking can begin immediately.
Concrete Bases:
Concrete footings require digging, setting up formwork, mixing and pouring concrete, and then waiting for curing. This process can take several days and often requires multiple trades.
Cost Considerations
Ground Screws:
While the raw cost per screw may be competitive with concrete, ground screws reduce labour costs, eliminate skip hire and minimise manpower thanks to rapid installation.
Concrete Bases:
Labour, excavation, waste removal, and formwork all add to the total cost. The concrete itself may be inexpensive, but the full installation price increases quickly.
Environmental Impact
Concrete production is responsible for a significant amount of global carbon emissions. Ground screws, on the other hand, avoid excavation, reduce waste, and can often be reused or fully removed.
Garden Preservation & Disruption
Ground Screws:
No spoil, no large machines rumbling across your lawn, and minimal disruption to existing landscaping. They’re especially handy in gardens with mature plants, trees, or uneven ground.
Concrete Bases:
Excavation and waste removal can disturb your outdoor space and may require turf restoration afterwards.
Long-Term Stability & Load Bearing
Both systems provide strong support for decks, but ground screws transfer load deeper into the ground and are less affected by soil movement near the surface. Concrete can heave or shift in freeze/thaw conditions if not designed properly.
When to Choose Each Foundation Type
Consider Ground Screws If:
- You want faster installation
- You need minimal site disruption
- Your garden has difficult ground conditions
- You value sustainability and reusability
- You’re installing on a slope or near sensitive roots
Consider Concrete Bases If:
- Your structure requires very deep footings
- You’re connecting to existing concrete pads
- You’re building something extremely heavy (consult a structural engineer)
For most decking projects, ground screws offer a faster, cleaner, and more environmentally friendly foundation, often with reduced overall costs and disruption.
Ready to Build Your Deck? Contact The Ground Screw Shop
Whether you’re planning a small garden deck or a large outdoor entertaining space, The Ground Screw Shop has the right foundation solution.
Contact our expert team, we can help you choose the perfect ground screws, calculate how many you need, and answer any questions about installation, DIY or professional.