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PostPosted: Mon Apr 16, 2018 3:33 pm 
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Hi all, am after a little advice on my wall I intend to build this week. As you can see from the picture, it will be about 5 ft high and I'm wondering if I could get away with 140mm or even 100mm block for this? I know bigger the better probably in this case, but space is at a premium and I want to get as much as possible. Do you think this would be ok?


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PostPosted: Mon Apr 16, 2018 5:11 pm 
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It doesn't sound like enough to me for 5'0" high.

If you scroll down near the bottom of the page on the link below it gives a basic spec for a retaining wall of 1.0m height and it's way more than your 140mm.

http://www.pavingexpert.com/featur03.htm

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PostPosted: Mon Apr 16, 2018 7:20 pm 
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Its not an area to skimp on IMO; if the ground starts to slip then the saved inches could become very costly. But much of the thickness, especially towards the wider base, can be within the bank, so it isn't very apparent or space-hogging once finished. Though if its a boundary wall there may be territorial complications with that.

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PostPosted: Mon Apr 16, 2018 10:29 pm 
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Soil looks fairly stable. I’d pour a 8” deep, 12” wide foundation. Then build block on flat I.e. 215wide, 140m high x 440mm LG. Ensure you deal with drainage behind wall to minimise hydrostatic pressure.



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PostPosted: Tue Apr 17, 2018 9:43 am 
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Thanks for the advice all. I'll take you up on that and go with the 215 mm concrete blocks. Very helpful


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PostPosted: Wed Apr 18, 2018 7:55 am 
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Laid flat like this:
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