Workshop
Start a discussion

The Bunnings Workshop community can help with your home improvement projects.

How to build retaining wall on fence?

S_Mack
Newbie

How to build retaining wall on fence?

Hi I have a boundary fence that separates me and my neighbour. The neighbours soil keeps coming under the fence due to there land being 50-150mm higher. I am planning to build a retaining wall on the fence and would like some ideas. Cheers

StevieB
Retired Team Member
Retired Team Member

Re: How to build rentaining wall on fence

Welcome @S_Mack. It's great to have you join us.

 

You might like to check out @steveof2620's project Retaining wall with Whites Retain It system and @Adam_W's guide How to build a retaining wall to get you started.

 

Could you share a picture of this space? That way community members can get an idea of what you're working with and will be better equipped to offer suggestions.

 

Stevie

 

See something interesting? Give it the thumbs up!
MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: How to build rentaining wall on fence

Hi @S_Mack,

 

Would you need to create an entire retaining wall, or could you dig down slightly at the fence line and then attach 200 x 50mm 3.0m H4 Treated Pine Sleepers at the base of the fence's posts with bugle screws?  That should stop the soil from migrating under the fence and be much less effort than the retaining wall.

 

Mitchell

 

See something interesting? Give it the thumbs up!

Re: How to build rentaining wall on fence

Hi @MitchellMc 

Good day. I hope you are doing well.

 

I just bumped in to this post while looking for a solution to a somehow similar issue with my fence. There is a small gap between the ground and the wooden sleeper of our fence (roughly 30 to 40mm). This is only on some sections of the fence on my left and right and not all (probably the way the land is sloped).  I am thinking and would like to try your suggestion of putting sleepers to fill the gap. But I am not sure how to do it. I can buy and cut the sleepers in Bunnings about 30mm high and cut them to length matching the length of my existing sleepers (post to post). But should I insert this sleeper underneath the existing sleeper? If yes, what is the best way to do it as I am not sure I can bend the sleeper easily to be inserted? Personally I would prefer this way as it would be neat and gives me a few mm of space between the fence and our apron/perimeter concrete to still put some plants/pebbles. Or what you meant by attaching sleepers is to screw the new sleepers to the existing ones side by side/flat to each other? 


I appreciate any suggestion.


Thank you in advance.

 

Fence pic2.jpeg

MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: How to build rentaining wall on fence

Welcome to the Bunnings Workshop community @1smallstep. It's wonderful to have you join us and many thanks for your question about filling the gap under your fence.


What do you intend on placing between the concrete slab and the fence? When a building is constructed the slab height is normally positioned to allow for fill around it. I presume the bottom of those treated pine slabs is below the top of the concrete slab? The bottom of the treated Pine slabs would be covered over with whatever fill you are placing in this area. I've constructed a rendering below to illustrate better. This is further indicated by the fact that the top of the concrete footers are sitting above the current ground level. I'd say your fill should come right up to at least the bottom of the treated slab. Once you and your neighbour do this, there will be no need for an additional divider.

 

You're correct that you'll have difficulty getting a board into that position and I suspect that the slabs there were slid down from the top of the posts prior to the construction of the fence. Your only option now would be to connect to their face and have your new slab proud of the fence line.

 

Please let me know if you have any questions.


Mitchell

 

See something interesting? Give it the thumbs up!

Re: How to build rentaining wall on fence

Hi @MitchellMc 

 

Thank you so much for your reply and clear explanation. I greatly appreciate your time and effort of creating a render to visualize it. 😃 I will fill the space between slab and fence with pebbles and a handful of small shrubs. I think my problem is that the bottom of the treated pine sleepers is a few mm higher than the concrete slab apron in some sections of the fence. But I think I get it now and will have to attach the new sleepers face to face with the existing ones. Would you be able to recommend the best screws for this job? Thanks a lot!

MitchellMc
Bunnings Team Member
Bunnings Team Member

Re: How to build rentaining wall on fence

@1smallstep,

 

If the sleepers are both 50mm thick, Zenith 14 - 10 x 75mm Galvanised Type 17 Batten Bugle Head Timber Screws would be suitable. You might like to countersink them 10mm into the front sleeper, so a little more thread bites into that back sleepers face.

 

Please keep us updated on your project and reach out if you need further assistance or have questions.

 

Mitchell

 

See something interesting? Give it the thumbs up!

Why join the Bunnings Workshop community?

Workshop is a friendly place to learn, get ideas and find inspiration for your home improvement projects