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Footing Options: Concrete vs. Helical Piles

4:10
15:55
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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)

What they say

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building department. Next up, number three, we're going to talk about footing. So, there's two typical types of footings that we use and most builders are going to use, and that's concrete footing versus a helical pile. I'll talk about the pros and cons of both and why most of the time we choose helical piles. So, we'll start with concrete. Concrete is what you'll see on probably 90% of decks and when done properly, completely fine. So, a concrete footing obviously starts out with a hole in the ground. And depending on where you live, you'll have a different frost depth. Where we are, it's about 32 in, but check with where you live. And if you're in a warmer climate somewhere, it might only be 12 in or less. But if you're in a really cold climate, it could be 4T, 5T. Um, so definitely check with that and make sure that your footings go below the frost steps. So, with a concrete footing, you have to dig the hole. That takes labor. It takes time. Then you're going to need a footing inspection on that. So, an inspector will need to come out, look at the hole, and make sure that you're deep enough for the frost depth, and you're good to go to pour the concrete. So far, we don't have a lot of costs involved with the concrete footing, just the labor to dig the hole and wait for the inspector. A lot of times, you will use a cardboard sauna tube. That costs about $20. And then for our area, 32 in, we're going to need about six bags of concrete to fill that hole. So, now we're at $20 for the cardboard form. And we've got about six bags of concrete, about six bucks a piece. $36. So, we're at $56 so far. Now, on top of that, you're going to need an attachment to attach your post to that. You're going to need a Jbolt that you can wet set in the concrete or a concrete anchor that you can install after it's cured. That's not very expensive. So, it's going to cost you maybe a couple bucks. But then you need a base plate. Those for a 6x6, which is typically what we use, are going to be about $22 or so. So, right now we are already up to $78 for a concrete footing. and we've got a lot of labor invested into that. Now, I'm going to talk about helical piles. You've probably seen us use them if you follow us, but it's a long helix on a steel pipe and it gets drilled into the ground at a certain torque. Two reasons we really love these. Number one, they're super quick. We sub them out, so they're installed. They don't need an inspection because they're installed to a certain…

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