Retaining wall of pressure-treated wood

[Ali83]

Hello!
I need to build a retaining wall that varies in height from 10 cm to about 70 cm.

I'm wondering if I can do the following:
Dig down ground anchors 70x70. Set up posts in them to then build the wall with pressure-treated wood like 45x120.

On the inside of the wall, I plan to have old paving slabs standing up against the wall so they function as an insulating layer between the soil and the wood. The wall will be directly behind a hedge so it is hidden.

Am I completely off track? If it would be a possible solution, do I need to cast around the top part of the ground anchors for reinforcement?

Grateful for any tips and feedback!

 

[Poxeman]

Are you thinking about braces/thickness of the "wall" or just a fence?
70cm of earth pressure is not something to joke about

 

[Ali83]

Yes, my idea is just planks that are 45 in thickness.

 

[topmount]

If you're going to cast something, I would focus on casting a threaded rod into the bottom one meter into the slope, which then goes diagonally up to the top of the fence/wall. This anchors the posts with the weight of the earth.

 

[MMarkstrom]

Did it work out? I'm also considering a similar project.
View attachment 380859

 

[InsidersUnited]

What is your time horizon? Do you want to build something that will last a year or a few years? I don't think it's a good idea with buried timber. I don't believe ground anchors will work, they don't even work for setting posts in...)

 

[JKrister]

Did it work out? I'm also considering a similar project.
[media]

I don't see any major issues with pressure-treated wood underground. However, I would build with logs and reinforcing bars through the layers. Then you occasionally insert a log directly into the slope.

The problem with using planks is that they dry out and can't handle a wide span.

 

[Ali83]

Did it happen? I'm also considering a similar project.
[media]

Hi
I have started the project but not finished yet.
Dug down about 60-70 cm and cast pressure-treated class A, 95x95 directly in the ground. Then planks 220x45 on the inside of the posts, landscape fabric covering the inside of the planks against the soil. Then I had stone slabs 50x50 that I wanted to get rid of, so I placed them on the inside (like tiling the inside, to extend the lifespan of the wood).
Maybe I'll regret it in 10 years, but if you don't try, you'll never know.
I can send pictures if you want!

 

[MMarkstrom]

Hi
Started the project but not finished yet.
Dug down about 60-70 cm and cast pressure-treated class A, 95x95 directly into the ground. Then plank 220x45 on the inside of the posts, Ground fabric covering the inside of the planks against the soil. Then I had stone slabs 50x50 that I wanted to get rid of so I placed them against the inside (like tiling the inside, to extend the lifespan of the wood).
Might regret it in 10 years, but if you don't try, you'll never know.
Can send pictures if you want!

I myself cast post shoes in concrete and set 90x90 posts, then two threaded rods into the slope where I had drilled a hole and cast the posts, set as pergola then 45x90 between the posts, turned out great.

 

[Hamled]

How did it turn out? Can you show some pictures?

 

[Ali83]

How did it turn out? Can you show some pictures?

Now the hedge is thick so it's hard to see.

 

[Ali83]

How did it go? Can you show some pictures?

It went well. I cast the posts directly into the ground. I put up the wall with pressure-treated beams. On the inside, I laid marplattor and Markduk so the wood doesn't come into contact with earth.