Footing Options: Concrete vs. Helical Piles
At 4:10 in
Why Most DIY Deck Frames Fail (And How to Succeed)
What happens here
This step discusses the two primary types of footings used for decks: concrete footings and helical piles. Concrete footings involve digging a hole to the required frost depth (which varies by location, e.g., 32 inches in the video's location, but could be 12 inches to 5 feet elsewhere), having it inspected, and then pouring concrete, often using a cardboard sonotube as a form. The cost for a single concrete footing can be around $56 (e.g., $20 for a sonotube and $36 for 6 bags of concrete) plus labor for digging and waiting for inspections/curing. Helical piles are long steel shafts with a helical blade that are drilled into the ground to a specific torque. They are quicker to install (hours vs. days for concrete) and don't require a footing inspection because their installation to a certified torque guarantees bearing capacity. While more expensive upfront (around $275-$350 per pile installed), they save time and provide more certainty regarding load-bearing capacity, especially in areas with unsettled or over-dug soil, where concrete footings might settle over time.
Goal: Evaluate concrete footings and helical piles for deck support, considering cost, time, and reliability.
Tools and materials
- Base Plate — Mounting posts to concrete footings (e.g., for a 6x6 post)
- Cardboard Sonotube — Forming concrete footings
- Helical Piles — Foundation support, drilled into the ground
- J-bolt — Attaching posts to concrete footings (wet-set or post-cure)
- Mini Excavator Caterpillar — Operating helical pile installation (often subcontracted)
- Concrete bags — Filling a sonotube for a concrete footing (for a 32-inch frost depth)
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