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Old 01-12-2019, 12:48 PM   #1
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Terracing utilizing two low retaining walls


I am planning two 40' long x 12" high stacked block retaining walls utilizing those blocks with the ledge on the back. They will be approx 15' apart with a rise of 20".

I am concerned because I don't want to jeopardize the foundation on my house as the walls will be in the fill that the house was put on.

I am in north central Florida where we don't have freezing soil issues. From what I understand, if my walls are under 4', a drainage pipe is not needed? I am only planning the walls to be 3 or 4 blocks (4" each) high with the landscape fabric encapsulating the drainage rocks behind it.

I have attached a drawing of my plan and some photos of the area that I will be building the walls on. The walls are approx 15' apart and 40' long. The rise is only 20".

Is my plan sound? Do I need the drainage pipe? Would brown river rock be acceptable for the drainage rock? (it's the least expensive option at Lowes here). How much rock will I need?
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Terracing utilizing two low retaining walls-mvimg_20190109_140503957.jpg   Terracing utilizing two low retaining walls-mvimg_20190109_133122264.jpg   Terracing utilizing two low retaining walls-mvimg_20190109_133505712.jpg   Terracing utilizing two low retaining walls-mvimg_20190109_133133922.jpg   Terracing utilizing two low retaining walls-wall.jpg  

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Old 01-12-2019, 01:21 PM   #2
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Re: Terracing utilizing two low retaining walls


It is the water soaked dirt behind a wall that pushes them over so drainage is important. I would want a perforated pipe in behind to take the water somewhere.
If you put gravel in 1 foot wide and 1 foot deep you need 107 cubic feet or 4 yards.


Wrap the gravel in filter cloth.
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Old 01-12-2019, 03:09 PM   #3
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Re: Terracing utilizing two low retaining walls


Definitely use perf pipe - do this right the first time so you don't have to do it a second time !
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Old 01-12-2019, 08:14 PM   #4
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Re: Terracing utilizing two low retaining walls


Your sub-base is just as important to keep the wall level. Make sure to compact all of it.

You might want to crop out your personal info in that first pic too.
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Old 01-13-2019, 10:09 AM   #5
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Re: Terracing utilizing two low retaining walls


Quote:
Originally Posted by Nealtw View Post
It is the water soaked dirt behind a wall that pushes them over so drainage is important. I would want a perforated pipe in behind to take the water somewhere.
If you put gravel in 1 foot wide and 1 foot deep you need 107 cubic feet or 4 yards.


Wrap the gravel in filter cloth.
If Nina just uses that stacked block I don't think a pipe is necessary, as long as she includes the wrapped gravel diaphragm behind the wall at the heel. The blocks will have enough perforations for the gravel to drain.
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Old 01-13-2019, 10:52 AM   #6
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Re: Terracing utilizing two low retaining walls


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Originally Posted by huesmann View Post
If Nina just uses that stacked block I don't think a pipe is necessary, as long as she includes the wrapped gravel diaphragm behind the wall at the heel. The blocks will have enough perforations for the gravel to drain.
And you will guarantee that?
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Old 01-13-2019, 04:56 PM   #7
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Re: Terracing utilizing two low retaining walls


Those blocks don't have any perforations in them.
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Old 01-16-2019, 06:15 AM   #8
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Re: Terracing utilizing two low retaining walls


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Those blocks don't have any perforations in them.
They will have sufficient space between them for draining hydrostatic pressure unless she grouts them all together.
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