mo1
Platinum Member
I've seen 3x the size online but nobody seems to do that in real life. What size bit would you use for a 4x4 post? I will use either concrete or the foam stuff, probably the foam, so maybe the hole should be smaller diameter?
I use whatever auger is on the post hole digger, as long as it is at least a few inches larger in diameter than the post so I can tamp the dirt back in around the post. If I was concreting in a post, three times the post diameter would be the correct size. Rarely do posts get concreted here as the soil is heavy clay and holds posts well when compacted.