Do wood posts for a retaining wall need concrete?

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  #1  
Old 05-10-18, 05:08 PM
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Do wood posts for a retaining wall need concrete?

I am putting in a couple short retaining walls(1-2 feet in height), they will be 4x4 posts every 4 to 5 feet with 2x8's for the actual walls attached horizontally. I am in the upper midwest so we see lots freezing but I am under the assumption that the wall should move with the ground. That being the case am I ok just using the posts set in dirt or do I still need to set them in concrete? I wall have them angled back towards the high part of the ground as well.

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  #2  
Old 05-10-18, 05:14 PM
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I often used tamped crushed stone to back fill around posts. If done properly the posts are set rock solid and a post can be set and at full strength in less than 10 minutes. Sometimes though a post can benefit from the extra mass of concrete so you have to use your judgement since only you can see the soil where you're setting the posts.
 
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Old 05-11-18, 02:44 AM
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While I've never built a retaining wall that way I have put in my share of wooden fence posts. A lot depends on the soil the post is sunk in. I've had some that did fine without any concrete while others had to have concrete - the only difference was the ground.
 
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Old 05-11-18, 05:06 AM
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You do know that most 2X's are not below grade rated, right?
 
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Old 05-11-18, 08:05 AM
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You do know that most 2X's are not below grade rated, right?
The ones I am using are. Thank you though.
 
  #6  
Old 05-11-18, 11:48 AM
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So what is going to be on the back side of the retaining wall?
 
  #7  
Old 05-11-18, 12:51 PM
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Not sure I follow? Standard drainage rock tubing etc then backfill
 
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