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Old 04-22-2010, 04:30 PM   #1
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making planter boxes out of cinderblocks


I am building a planter out of cinderblocks 6X8X16 for the front yard of my home. it will be 3 blocks high due to a slight slope of the yard the majority of the first row will be buried.

The question I have is should I build this on a compacted gravel or can I just compact the the soil they are sitting which is mostly clay.

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Old 04-22-2010, 04:46 PM   #2
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making planter boxes out of cinderblocks


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build this on a compacted gravel or can I just compact the the soil they are sitting which is mostly clay.
Do you have 'expansive soil'?


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Old 04-22-2010, 05:01 PM   #3
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making planter boxes out of cinderblocks


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Do you have 'expansive soil'?
according to a soils report I have moderately expansive clay soild. the house was originally build on a wedge of fill about 50 years which I believe has compacted quite a bit over the years.
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Old 04-22-2010, 06:26 PM   #4
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making planter boxes out of cinderblocks


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Do you have 'expansive soil'?
do you treat it differently than cheap soil?


Oh, you said expAnsive



never mind.
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Old 04-22-2010, 08:00 PM   #5
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making planter boxes out of cinderblocks


rocketdoctor -

Take a look at smaller landscape versions of the segmental concrete block (Allan Block, Anchor Wall Systems, Keystone and Versalok). They all have good idea sites and installation suggestions and are available in almost every area of the U.S. and in many foreign countries. They all have smaller units for low walls like yours and do not specify or recommend a concrete footing. - Just set them on a level and sound base for a short wall like yours. If you want to go 40' high, like they can do, that will take engineering, but still no concrete foundation.

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Old 04-22-2010, 09:06 PM   #6
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making planter boxes out of cinderblocks


thanks Ive built walls out of segment block (anchor) which they all recommed a gravel base of at least 6 inches. This is going to be 2' tall out of out of the Cinderblock you motar together its for meant to give a very modern look. I was just think of levelling and compacting the dirt and building the walls its sits directly over a french drain so I don't think there will be much movement
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Old 04-22-2010, 09:24 PM   #7
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making planter boxes out of cinderblocks


If there's no vertical or horizontal lines nearby it might not matter if the planter heaves a little with soil expanding & contracting.
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Old 04-26-2010, 01:21 PM   #8
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making planter boxes out of cinderblocks


hired some day laborers to help me build this. We ended up pouring a few inches of concrete with a thick consistency. Set the concrete blocks right on top while still wet. This was a lot easier and cheaper than creating a base rock bed. I think for a planter box of just two rows high this is fine.

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