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Re: Concrete Joist Shear

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Don't expect light weight planter soil to remain light weight indefinitely.
The foam or vermiculite pellets will eventually disintegrate or compact, the
gardeners will add more soil to keep the roots covered, and the weight will
begin to approach that of ordinary soil.  The trees, depending on their
species, can get large and heavy.

Nels Roselund
Structural Engineer