[GWN7]

Up here I use 1/4 down limestone. Our soil is mostly clay. The limestone locks together like concrete but unlike concrete it allows water to drain away. Always put some in the bottom of the hole to raise the wood post up off the ground. Then put the post in the hole. Add enough material to go around 1/3 of the post and then tamp it down with a lining bar. This sets the post and allows you to level it on both sides. Then add another 1/3 of the material to the hole and tamp it down again. Rechecking the level. Fill the rest of the hole and tamp.

Never use concrete as it creates a bucket effect for wooden posts effectively trapping the post in any water causing it to rot.

The new thing being touted to set posts is a 2 part foam. You mix the foam and pour it into the hole with the post in place. Scrap wood is used to set the levels. An hour later the foam is set and you can start building. It is supposed to be better than concrete for grip strength but like concrete it might trap water next to the post causing rot.