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Old 06-27-2013, 11:10 PM   #1
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Retaining Wall Paver Without Interlock


Hello. Landscape newbie here.

My wife wants a 1ft-tall retaining wall around her garden, about 15ft by 10ft. The garden is on the side of the backyard. Lawn is fairly flat. Currently the garden is surrounded by a single course of 4x4 treated wood sitting right on the soil. I don't know when the previous owner put the wood down, but a lot of it is rotted.

The blocks that she picked have no interlocking lips:
http://www.lowes.com/pd_477095-215-308290_0__

Each block is 4in tall, so we are thinking about 3 courses.

1. Is gravel and sand needed in this case? If so, how much?
2. Is glue needed between courses since there's no interlocking lips?

We are located in NJ if it matters.

Thank you in advance!!!


Last edited by leungw; 06-28-2013 at 05:44 AM.
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Old 06-29-2013, 07:42 PM   #2
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Retaining Wall Paver Without Interlock


Any reason your going that high?

They have glue you can use. I'd do that over sand and rock seeing its a garden.

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Old 06-30-2013, 09:14 AM   #3
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Retaining Wall Paver Without Interlock


At one foot tall, with that type of block, you can probably get away without any drainage behind the wall, and using typical garden soil. And you do not need to glue the blocks in place. Somewhere around two feet high you need to start following manufacturer directions, and at 4 feet and higher, you are almost certainly going to need soil reinforcing fabric, unless you get into really large block with special interlocks.

As an aside, for gravity walls, a reasonable rule of thumb is that the width of the base needs to be approximately 40 percent of the height of the wall, so for a one foot high gravity wall, the base needs to be about 5 inches wide, and your blocks are pretty close to that.
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Old 06-30-2013, 07:11 PM   #4
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Retaining Wall Paver Without Interlock


Quote:
Originally Posted by Tatertot View Post
Any reason your going that high?
Because one corner is about 4 inches higher than the opposite corner. If we do only two courses high, then it would seem too low at one corner.
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Old 06-30-2013, 07:13 PM   #5
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Retaining Wall Paver Without Interlock


Quote:
Originally Posted by Daniel Holzman View Post
At one foot tall, with that type of block, you can probably get away without any drainage behind the wall, and using typical garden soil. And you do not need to glue the blocks in place. Somewhere around two feet high you need to start following manufacturer directions, and at 4 feet and higher, you are almost certainly going to need soil reinforcing fabric, unless you get into really large block with special interlocks.

As an aside, for gravity walls, a reasonable rule of thumb is that the width of the base needs to be approximately 40 percent of the height of the wall, so for a one foot high gravity wall, the base needs to be about 5 inches wide, and your blocks are pretty close to that.
Thank you very much for the info.
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