Hi Penny, welcome to the group.
Sraight concrete would probably be a more long lasting material for
your project. However, a papercrete mix rich in cement might be
effective. The amount of foundation required depends upon how tall
the retaining wall is. If you're just building a raised planting bed
6" above grade, you don't need much. A packed gravel base under the
wall of a couple inches would be sufficient. If you are building
something 2-3 feet tall, you'll need a much more robust foundation
and a serious wall that can handle the lateral pressure.
Papercrete isn't the most ideal material for exposed wet
environments. It can be used, but expect it to deteriorate over
time. Papercrete is a WOOD PRODUCT. Sealing it from moisture is the
best bet to slow deterioration.
--- In papercreters@yahoogroups.com, "pennymca13"
<penpaloriginals2@...> wrote:
>
> After stumbling into the world of papercrete this week, I've become
> quite excited about creating blocks to use as a low retaining wall
> around my garden area.
>
> Would I need to lay any sort of "foundation" for the blocks to rest
on
> or can they go directly on the dirt/grass? We do have rather humid
> weather here most of the time though we are in a major drought
right
> now.
>
> TIA
>
> Penny, who is also dreaming of a way to build an art studio in her
back
> yard with this stuff....
>
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