It could but it's not a good solution. The way it expands is not very controllable. You could cut off excess easily with a sharp blade after it hardens. But a better thing to us is one of those foam in a can products that doesn't expand a lot ( there are several varieties). And since the wood is pressure treated, if there;s some lingering moisture at the gap because the wood will be connected to the ground after you add foam, it still is unlikely to rot. You could also shove those foam noodles (3/8 inch or so dia) into place. Put some caulk behind it to make it stick)
Not sure..... but it worked great for 4x4 wooden posts I used for my privacy fence. It has a consistency similar to the foam in a can. I guess it’s a mid ground between just sinking posts in the ground and pouring concrete around them. I had a good experience with the product and would recommend it.
no - no way to control its expansion.
It will work great since it expands to form the void beautifully.
You’d be fine. I did mine shortly after a hurricane and the soil was wet. Had no problems
Yes, actually you dont want to overmix. Once you mix it you have to use it and you only have a about 15 seconds or so to pour out.
I think you’re referring to concrete form tubes. I don’t use them for fence posts and I don’t think you do either. By using the bare post you fill the entire space between the post and earth with concrete or foam. By using a tube you have to fill the space between the tube an earth with rocks or packed dirt. Not nearly as stable.
you can't eaasily control where it will foam up so I would use it under a paving slab