Typical Drilled Pier Sizes

[v1j2j3]

Hi,

I am just wondering what're typical pier sizes for 4 ft and above? Do they all come in 6 in increments?
Is that normal to size pier diameter as 4' - 9" or 4' - 8"?

 

[JAE]

Here's a company document that shows several types of augers.
They list the range of diameters available but not the actual diameter increments.

https://www.pengoattachments.com/sites/default/files/PENGO FOUNDATION-website.pdf

In the past I've used diameters as follows:
24
30
36
42
48
54
60
66
72
and have used a 90" once as well.

 

[TigerGuy]

I've seen 96" as well. I've seen 6-inch increments up to 72, then 12 inch increments above that. I have heard of up to 12-foot diameters.

 

[dik]

Some jurisdictions require shafts in excess of 30" or 36" if they require hand inspection or they may require that the caissons have a metal sleeve, too.

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik