Retaining wall / landscaping

Joined
27 Mar 2011
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Location
Merseyside
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United Kingdom
Hi all, I'm new to the forum and am looking for some advice on building a retaining wall. Any advice you can offer will be greatly appreciated.

The scene:
My garden backs on to fields approximately 1m higher than garden level. My rear fence is at field level. At the rear of my garden is basically a big mound of dirt sloping from field level to garden level. This slopes about 2 metres in (approx 30* gradient) finished off with a small rockery of about 0.4m. It is not the most attractive of features and the soil / dirt is hard, full of rocks and basically couldn't grow a weed in it. The rear fence is approximately 10m long with a central gate onto the back field.

The intention
Build a two tier retaining wall with two planting levels. The first level about 0.6m and the top level about 0.4m. The wall will be split in the middle with steps going up to my back gate.

The Dilemma
I am totally unsure of how to approach the retaining wall. My idea is to use 215mm solid dense concrete block for both tiers faced off with a single skin brick wall. Is this overkill or would 140mm Medium dense suffice? I am planning for footings of 6-8" deep and 1 1/2 to 2ft wide - would this suffice? Also is it worth trying to tie the two walls together using wall ties?

The method:
Would it be best to do the lower retaining wall first then dig down for the higher retaining wall 1ft below the top of the lower retain wall for footings?

A possibility:
There may be a section of 3m where I do away with the lower tier and build part of the wall the full 1m height as I will be building a shed and pushing it as far back as possible.

Thank you very much in advance for any suggestions / advice.
 
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Better put in building section for expert advice, though the footings seem very shallow for a retaining wall.
 

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