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Old 03-30-2014, 02:01 PM   #1
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Retaining wall for garden on sloped yard


Hello all I am in need of help building a retaining wall on a slope so I can make a garden. My backyard has a slope, 4:1 I think people call it. For every 4 feet of horizontal it drops 1 foot in vertical. I have the supplies to build a retaining wall however I had a few questions before I proceeded.
1. I plan to do all my digging work with a Toro Dingo or Ditchwitch, anyone ever use these or have any suggestions of which one of these are best in their class.

2. Design for retaining wall. So as I see it I can flatten my slope in the backyard 3 different ways.

a. Back cut into the slope creating a level area and create a approximate 3 foot wall since my garden will be about 10 feet into the slope and 16 feet along the slope.

b. Do the exact opposite and fill the area with dirt and create a 3 foot wall in front.

c. Do a mixture of the two and take dirt from the higher area and push it to the lower area. I will then need a shorter wall where I cut into the hill and a small wall in front.

Of the three choices which would be the easiest. I dont know how much work is involved in compacting dirt so choices b and c could be a lot of work. The area isn't huge which works in my favor. Please let me know what you think thank you for all the help in advance.

Lenny
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Old 03-30-2014, 02:31 PM   #2
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The simplest type of retaining wall to construct uses segmental concrete block. For a three foot tall wall, this is pretty simple, you typically prepare a solid base (can be natural soil, a little compaction is typically necessary), install the blocks (follow manufacturer's directions), install drainage tile if needed (usually is necessary), then backfill according to manufacturer instructions.

Course you haven't mentioned what type of wall you are constructing, other than to mention that you already bought the supplies. Perhaps you can tell us what you had in mind, as the procedure is quite different for railroad ties, stone, or a poured concrete wall.
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Old 03-30-2014, 02:39 PM   #3
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Sorry forgot to mention that. They are interlocking blocks. I also purchased pavers base and backfill gravel. As well as a perforated pipe for drainage.
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Old 03-30-2014, 02:45 PM   #4
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Then you are all set to go. I would cut the slope back to vertical, gives you a little more room, but it really depends on what you looking to accomplish. If you cut the soil back, you need to remove manufacturer recommend amount of soil from the uphill side of the wall, and replace with gravel. Typically for a 3 foot high wall, you will need about 1.5 feet of gravel behind the wall, but check manufacturer's specs.
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Old 03-30-2014, 02:53 PM   #5
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I dont see how a ditch witch will help. A dingo might be alright if you have sandy dirt. Around me I would only think of doing it with a backhoe. I have alot of rock.
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Old 03-30-2014, 02:59 PM   #6
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Oh ditch witch makes a dingo like skid steer. I have rather soft dirt no real rock.
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Old 03-30-2014, 03:03 PM   #7
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you will have alot of dirt left over like dump truck loads so keep that in mind
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Old 03-30-2014, 03:04 PM   #8
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I think you need something bigger like a bobcat. It would take days with a dingo so you wont be saving money wise.
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Old 03-30-2014, 03:05 PM   #9
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The extra dirt I can use some to fill in some holes I have. But you are correct that's why I was wondering if option c was best. Pushing the higher part into the lower part thereby using the dirt.
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Old 03-30-2014, 03:14 PM   #10
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If you werent installing pavers it would be the better option but with pavers you do not want to back fill the dirt
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Old 03-30-2014, 03:15 PM   #11
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Are pavers the same at the big blocks with the lip in the back so they can hook?
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Old 03-30-2014, 03:18 PM   #12
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No bottom is flat. There is built in spacers around edges
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Old 03-30-2014, 03:21 PM   #13
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Okay. I have 30 blocks made for retaining walls with the lip on the back.
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Old 03-30-2014, 03:23 PM   #14
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Is that the wall cap you are talking about?
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Old 03-30-2014, 03:24 PM   #15
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or are you just saying retaining wall blocks have lip
What size block did you go with

Last edited by JustinK; 03-30-2014 at 03:24 PM. Reason: What size block did you go with
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