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Old 05-18-2013, 09:52 AM   #1
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How to prep wall of landscape blocks for dirt containment


The photo shows a sample of a wall we built. Do we need to put in a barrier to keep the forthcoming fill dirt from leeching through the stones?
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Old 05-18-2013, 10:10 AM   #2
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How to prep wall of landscape blocks for dirt containment


Use a clean granular back fill of different size particles (coarse sand to 3/4" rock), but do use a "filter fabric" behind the wall (unattached) before putting in the backfill.

Dick

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Old 05-18-2013, 10:14 AM   #3
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How to prep wall of landscape blocks for dirt containment


Why the different size materials? Drainage? Will the fabric prevent any staining on the stone face?

Thanks.
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Old 05-18-2013, 10:43 AM   #4
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How to prep wall of landscape blocks for dirt containment


The wall looks to be no more than 18 inches high. I built a similar wall (mine was up to 2-1/2 feet tall) in my backyard, and it worked fine without any filter cloth, and without using select granular backfill. Usually for segmental block walls such as yours that are less than 2 feet high, you can get away with minimal preparation, for example you do not need a footer, you usually don't need a drain pipe on the uphill side, you don't need reinforcing, you don't need filter cloth, and you don't need select granular backfill. None of that hurts, except in your pocketbook, but in my experience it is not necessary for short walls. When you get to 3 feet and taller, you need to be much more careful if you want good results.
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Old 05-18-2013, 10:47 AM   #5
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How to prep wall of landscape blocks for dirt containment


I did put in 6" of 3/4 minus for a footer. Even with that, a 4' section raised 1" over the winter.
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Old 05-20-2013, 12:00 PM   #6
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How to prep wall of landscape blocks for dirt containment


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Originally Posted by Daniel Holzman View Post
The wall looks to be no more than 18 inches high. I built a similar wall (mine was up to 2-1/2 feet tall) in my backyard, and it worked fine without any filter cloth, and without using select granular backfill. Usually for segmental block walls such as yours that are less than 2 feet high, you can get away with minimal preparation, for example you do not need a footer, you usually don't need a drain pipe on the uphill side, you don't need reinforcing, you don't need filter cloth, and you don't need select granular backfill. None of that hurts, except in your pocketbook, but in my experience it is not necessary for short walls. When you get to 3 feet and taller, you need to be much more careful if you want good results.
I apologize if it appears that I am highjacking this thread. I just want to be clear since I have a similar question to that of the OP. I am building a small free-standing wall as a divider between the sod and flower bed, similar to that shown in the photo by the OP. The plan is to only go two blocks high and then the cap stone. Total height will be between 12-18". There will not be any backfill to contain. I live in south Florida so ground movement due to freezing is not a consideration. We can get extremely heavy rain, but the ground drains well.

Therefore, it sounds like I do not need any type of footer and the stones can be dry stacked on level well compacted ground. Is that correct?

David
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Old 05-20-2013, 04:04 PM   #7
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How to prep wall of landscape blocks for dirt containment


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Originally Posted by Jessidog View Post
I apologize if it appears that I am highjacking this thread. I just want to be clear since I have a similar question to that of the OP. I am building a small free-standing wall as a divider between the sod and flower bed, similar to that shown in the photo by the OP. The plan is to only go two blocks high and then the cap stone. Total height will be between 12-18". There will not be any backfill to contain. I live in south Florida so ground movement due to freezing is not a consideration. We can get extremely heavy rain, but the ground drains well.

Therefore, it sounds like I do not need any type of footer and the stones can be dry stacked on level well compacted ground. Is that correct?

David
I've always dug a shallow trench, maybe 1/2 the height of your first course of block. Once you compact the trench you fill in the first inch or two with sand. The sand compacts well and makes it much easier to level your blocks as you go. Here is a picture of one I built last weekend.
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Old 05-20-2013, 10:20 PM   #8
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How to prep wall of landscape blocks for dirt containment


Thank you. This sounds like a better idea.

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