Foam Vs Concrete For Fence Posts

I used 4 braces per post.

Foam vs concrete for fence posts.

Concrete is cheaper and pretty fool proof vs. To make a long story short i ended up setting all of the posts in this high density foam in lieu of concrete. 02 02 2016 10 02 am re. The general rule of thumb when setting a post is that the depth of the post s hole needs to be 1 3 to 1 2 of the actual above ground height of the post.

Expanding foam by meackerman the fence posts i ve if you go the gravel route the type of gravel makes a difference also. I used one of the heavy steel digging bars with a narrow spade on one end and an enlarged tamper on the other end. Its only one bag per fence post so its not a big deal. The foam like i said in the post there were possible issues with maybe the weather or the depth of the hole etc but if the whole point is to beat concrete i still say this failed in that respect.

The soil was a heavy black clayey soil. Also you do not have to cement every hole i do every other and the corners and gate support posts. I replaced termite riddled cedar installed with concrete with pressure treated. If they had tight time constraints and they needed the posts to be set up earlier than concrete would give them.

The diameter of your post hole should be three times the diameter of your post. The advantage for me is i could set a post by myself using a very simple system of temporary braces to hold the posts for 15 minutes until the foam set up. Do not exceed limit written on bag of concrete. If they were at a site where there wasn t easy access to water.

For a fence i think its fine to mix in hole but i find it is far easier to mix in a wheelbarrow. He also noted that the foam was a lot more expensive. So six foot high fence posts ideally need to be buried three feet into the ground. Here i would use a 5 8 minus unsifted with all the powder the comes from the crushing process.

Be mindful of how much water you add.