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How to fill gap between Colorbond fence and retaining wall?

Maj
Just Starting Out

How to fill gap between Colorbond fence and retaining wall?

Hi, we are building and the way they have cut/filled the block has left us considerably higher than our neighbour and a concrete retaining wall has been erected 400mm away from the existing colorbond fence. the depth is between 1000mm and 1500mm for most of the length of the block. I have seen other similar situations rectified by putted decking across however that was being supported by a timber fence. We can't back fill as that will eventually pop out the colorbond fence on our neighbours side. Any suggestions would be welcomed. Thank-you

EricL
Bunnings Team Member
Bunnings Team Member

Re: 400mm gap between colorbond fence and concrete retaining wall.

Hello @Maj 

 

Welcome to the Bunnings Workshop community. It's sensational to have you join us, and thanks for sharing your question about your Colorbond fence. 

 

In order to give our members a better idea of the configuration of the fence and retaining wall, would it be possible for you to post a few photos of the layout? Once our members see what it looks like, we'll be able to offer recommendations on how to move forward.

 

If you need a hand posting the photo, please let us know.

 

Eric

 

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Maj
Just Starting Out

Re: 400mm gap between colorbond fence and concrete retaining wall.

Hi Eric,

I hope these images help.

Thanks for your reply.

Also, sorry I thought this retaining wall was concrete - it's timber sleepers. (we have a concrete retaining wall on the other side of the property)

Kind Regards

Emma20251216_203531.jpg20251216_203545.jpg

EricL
Bunnings Team Member
Bunnings Team Member

Re: 400mm gap between colorbond fence and concrete retaining wall.

Hello @Maj 

 

Thank you very much for sharing those pictures. Now we've got a better idea of what's going on, I propose going with your proposed solution in your post. The "decking cover" can be supported by building a timber angle bracket anchored to the face of the retaining wall. The decking cover will not be that heavy and can be used as seating. However, I would not load it with anything too heavy as it might affect the retaining walls position. Its main purpose is to cover the gap and prevent anything and anyone from accidentally falling into the gap. 

 

If you have the same situation on the other side of your property, the same solution can be applied, and the timber bracket can be drilled into the concrete face of the retaining wall.

 

Let me call on our experienced members @Dave-1, @AlanM52 and @Nailbag for their recommendations.

 

If you have any other questions we can help with, please let us know.

  

Eric

 

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Nailbag
Home Improvement Guru

Re: 400mm gap between colorbond fence and concrete retaining wall.

Hi @Maj 

 

I'm going to re-tag @Dave-1 on this one as he had a great idea on a very similar post just a few weeks ago.

Nailbag

AlanM52
Amassing an Audience

Re: How to fill gap between Colorbond fence and retaining wall?

Hi @Maj,

 

I propose alternating sections of pot plants and seating.

Seating section.jpg

Seating section - timber supports in shallow holes filled with ready mix concrete.

 

Pot Plant Section.jpg

Pot plant section - Planter box with pot plants and topping of your choice, pebbles or mulch etc. supported with brackets.

LOL... I used MS Paint 3D 😃

 

Cheers

 

Maj
Just Starting Out

Re: 400mm gap between colorbond fence and concrete retaining wall.

Hi Eric,

That makes perfect sense!!!

Thank-you! I just couldn't for the life of me work out what to do and now that you've suggested that, I'm like why didn't I think of that!!!!

The Bunning Workshop is a great concept and I'm glad I've stumble upon it!

Have a great day 😊

Emma

Maj
Just Starting Out

Re: How to fill gap between Colorbond fence and retaining wall?

Hi @AlanM52 

Absolutely love your MS Paint 3D skills!! And you chose a very appropriate Poinsettia with Christmas upon us!!

Thank-you for your suggestions too - they're great. We may indeed break up the decking with pot plants. We'd need a post hole digger to put in timber supports, but it is certainly doable if we decide we need more support.

Thanks again - have a great day! 😊

Kind Regards

Emma

Dave-1
Community Megastar

Re: How to fill gap between Colorbond fence and retaining wall?

Good Morning @Maj 

You have a nice solid retaining wall there :smile: and yeah the gap is always a problem.

 

I am thinking of a two fold idea, along the lines of @EricL and @AlanM52  but a little different and hopefully cheaper.

Using 140 x 19mm Merbau SpecRite Pre-Oiled Decking - Random Lengths 

 

You firstly install some vertical posts screwed to the timber sleepers themselves. If you do the math you sleeper is 50mm wide I think, then if you screw a post sized timber to it you could get another 70mm to it. The timber dosnt have to be nice as you wont see it but has to be able to survive being outside. It wont touch the ground as its only screwed to the top and second sleeper maybe.

 

So you have 50mm sleeper, 70mm post (or larger)

You could run a narrower board on the sleerper side and then the 140mm can be run with it overhanging teh "post" by a third if needed, I wouldnt go further than that without support.

 

If you want let me know and I will see if I can sketch it up.

 

Dave

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