Move a dish about 15 feet...

[HipKat]

Yes, it sets that quickly but takes about 4 hours to cure enough to put weight on the post. That could be a lot of dead time for the installer.

No one waits that long. Once it's firm enough, they'd set the dish on it. The foam is ready in 10 minutes

 

[NYDutch]

The problem is with a 3' hole, even a 4' hole, using even a quarter of the bag it does much more than a small amount. It's crazy how much it expands - and then the other 3/4's of the bag gets thrown away

Well, there's the difference I guess. My power post hole digger has a 6" bit. Between that and going down the extra foot, there isn't much left over.

 

[HipKat]

Well, there's the difference I guess. My power post hole digger has a 6" bit. Between that and going down the extra foot, there isn't much left over.

Yeah, that's not what we use, sadly. They gave the guy augers that are about 3" wide, but I still use a regular post hole digger and even so, a half bag will blow foam way out of the hole, if you use the Post Hole foam.

 

[ClarkGable]

The gentleman that did my post in the yard install over 15 years ago used a post hole digger, then he flattened the end of the mast going into the ground with an engineers hammer and then poured cement into the hole. He filled it back in with dirt. That thing has never moved, despite me hitting it with the riding mower more than once, high winds including the 2012 derecho, etc.