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.

 

[dishdude]

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.

I used to take the foot off the J-mount and use the through bolt to clamp it around the pole.

 

[telstar_1]

But then what's actually holding the post? Just this expanded foam? At least with my method, there is direct contact with tight soil. Granted my method wouldn't work where there's a lot of sand or rock. But I grew up driving fence posts with a post driver- if that's good enough to hold cattle, well....

 

[HipKat]

But then what's actually holding the post? Just this expanded foam? At least with my method, there is direct contact with tight soil. Granted my method wouldn't work where there's a lot of sand or rock. But I grew up driving fence posts with a post driver- if that's good enough to hold cattle, well....

You understand the foam expands, right?? hence the name, expanding foam?? It expands into every nook and cranny of the hole, locking the pole in place

 

[arlo]

The MSDS points to urethane foam. If you don't know. Expanding urethane goes in every direction and not just the easiest path out. Pretty dense stuff. And unlike concrete, no tamping and tapping air pockets to get it to fill voids.
Looks like cool stuff and gets an installer in and out faster. Something magical and fun though with mortar and concrete, hustling with hydraulic mortar and concrete. Bad thing with foam? The spawn doesn't get to scratch "Bobby" in it or plant a palm print when nobody's looking. Yeah.